Disclosure of Invention
Accordingly, the present application is directed to at least a method, an apparatus, and an electronic device for calibrating a phased array antenna, which utilize the mutual coupling between adjacent antennas of the phased array antenna to calibrate the transmit-receive channel of the phased array antenna, thereby reducing calibration cost and calibration power consumption and improving calibration accuracy.
The application mainly comprises the following aspects:
in a first aspect, an embodiment of the present application provides a calibration method based on a phased array antenna, and for an antenna to be calibrated in the phased array antenna, the following calibration processing of a receiving and transmitting channel is performed: determining a calibration reference antenna for carrying out receiving and transmitting channel calibration treatment on an antenna to be calibrated from a phased array antenna, wherein the calibration reference antenna is any one of adjacent antennas of the antenna to be calibrated; a signal transmission link is established, wherein the signal transmission link comprises a radio frequency signal transmitted by a transmitter, and the radio frequency signal is transmitted to a receiver through a transmitting phased composite network, a transmitting antenna, a receiving antenna and a receiving phased composite network in sequence, wherein the transmitting antenna is one of an antenna to be calibrated and a calibration reference antenna, and the receiving antenna is the other of the antenna to be calibrated and the calibration reference antenna; and according to the signals received by the receiver, the calibration processing of the receiving and transmitting channels is completed.
In an alternative embodiment, the transceiver channel calibration process includes a transmit channel calibration process, and the signal transmission link includes a first transmit channel calibration link and a second transmit channel calibration link, where the transmit channel calibration process for the antenna to be calibrated is completed by: creating a first transmitting channel calibration link, wherein the first transmitting component calibration link comprises a radio frequency signal transmitted by a transmitter, and sequentially transmitting the radio frequency signal to a receiver through a transmitting phase control synthesis network, a transmitting channel corresponding to an antenna to be calibrated, the antenna to be calibrated, a reflecting target, a calibration reference antenna, a receiving channel corresponding to the calibration reference antenna and a receiving phase control synthesis network, and recording a first receiving signal received by the receiver through the first transmitting channel calibration link; creating a second transmitting channel calibration link, wherein the second transmitting channel calibration link comprises a radio frequency signal transmitted by a transmitter, which is sequentially transmitted to a receiver through a transmitting phase control synthesis network, a transmitting channel corresponding to a calibration reference antenna, a reflecting target, an antenna to be calibrated, a receiving channel corresponding to the antenna to be calibrated and a receiving phase control synthesis network, and recording a second receiving signal received by the receiver through the second transmitting channel calibration link; comparing the signal amplitude and the signal phase corresponding to the first received signal with the signal amplitude and the signal phase corresponding to the second received signal respectively; if the comparison results are consistent, finishing the calibration processing of the transmitting channel of the antenna to be calibrated; if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity of the transmitting channel of the antenna to be calibrated until the comparison results are consistent.
In an alternative embodiment, the transceiver channel calibration process further includes a receive channel calibration process, and the signal transmission link includes a receive channel calibration link, where the receive channel calibration process for the antenna to be calibrated is accomplished by: creating a receive channel calibration link, comprising: the radio frequency signals transmitted by the transmitter are sequentially transmitted to the receiver through a transmitting phase control synthesis network, a transmitting channel corresponding to the transmitting antenna, a reflecting target, a receiving antenna, a receiving channel and a receiving phase control synthesis network; recording a third receiving signal received by the receiver through a receiving channel calibration link and received by an antenna to be calibrated and a fourth receiving signal received by a calibration reference antenna; comparing the signal amplitude and the signal phase of the third received signal with the signal amplitude and the signal phase of the fourth received signal respectively; if the comparison results are consistent, finishing the calibration processing of the receiving channel of the antenna to be calibrated; if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity corresponding to the receiving channels of the antenna to be calibrated until the comparison results are consistent.
In an alternative embodiment, the calibration process of the transmit phased composite network is performed prior to the transmit receive channel calibration process: the antenna to be calibrated is used as a transmitting antenna, the calibration reference antenna is used as a receiving antenna, and a signal transmission link is established; respectively adjusting the amplitude adjustment quantity and the phase adjustment quantity of the receiving phase control synthesis network aiming at the receiving antenna to a first preset amplitude value and a first preset phase value; recording the signal amplitude and the signal phase received by a receiver; comparing the signal amplitude and the signal phase received by the receiver with the signal amplitude and the signal phase corresponding to the radio frequency signal output by the transmitting phase control synthesis network respectively; if the comparison results are consistent, the calibration processing of the emission phase control synthesis network is completed; and if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity corresponding to the emission phase control synthesis network until the comparison results are consistent.
In an alternative embodiment, the calibration process of the receiving phased composite network is performed before the calibration process of the transmit-receive channel is performed: the antenna to be calibrated is used as a receiving antenna, the calibration reference antenna is used as a transmitting antenna, and a signal transmission link is established; adjusting the amplitude adjustment quantity and the phase adjustment quantity of the transmitting phase control synthesis network aiming at the transmitting antenna to a second preset amplitude value and a second preset phase value respectively; recording the signal amplitude and the signal phase received by a receiver; comparing the signal amplitude and the signal phase received by the receiver with the signal amplitude and the signal phase of the radio frequency signal output by the transmitting phase control synthesis network respectively; if the comparison results are consistent, finishing the calibration processing of the receiving phase control synthesis network; if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity of the receiving phased composite network aiming at the receiving antenna until the comparison results are consistent.
In an alternative embodiment, the transmitter comprises a first transmitter and a second transmitter, and the receiver comprises a first receiver and a second receiver, wherein the transmitter scaling process is performed before the transceiver channel scaling process is performed: starting a target receiver, wherein the target receiver is one of a first receiver and a second receiver; establishing a first transmitter calibration link, the first transmitter calibration link including the transfer of radio frequency signals transmitted by the first transmitter to a target receiver; determining a first transmission attenuation rate corresponding to the first transmitter according to the radio frequency signal transmitted by the first transmitter and the radio frequency signal received by the receiver; establishing a second transmitter calibration link, the second transmitter calibration link including the transfer of radio frequency signals transmitted by the second transmitter to the target receiver; determining a second transmission attenuation rate corresponding to the second transmitter according to the radio frequency signal transmitted by the second transmitter and the radio frequency signal received by the receiver; and comparing the first transmission attenuation rate with the second transmission attenuation rate, if the comparison results are consistent, finishing the calibration processing of the transmitter, and if the comparison results are inconsistent, adjusting the transmission amplitude compensation value and the transmission phase compensation value corresponding to the first transmitter and the second transmitter until the comparison results are consistent.
In an alternative embodiment, the receiver scaling process is performed prior to the transmit-receive channel scaling process: starting a target transmitter, wherein the target transmitter is one of a first transmitter and a second transmitter; establishing a receiver calibration link, wherein the receiver calibration link comprises a radio frequency signal transmitted by a transmitter and is respectively transmitted to a first receiver and a second receiver; according to the radio frequency signals transmitted by the transmitter and the radio frequency signals received by the first receiver, determining a first receiving attenuation rate corresponding to the first receiver; determining a second receiving attenuation rate corresponding to the second receiver according to the radio frequency signal transmitted by the transmitter and the radio frequency signal received by the second receiver; and comparing the first receiving attenuation rate with the second receiving attenuation rate, if the comparison results are consistent, finishing the calibration processing of the receiver, and if the comparison results are inconsistent, adjusting the signal receiving amplitude and the signal receiving phase corresponding to the first receiver and the second receiver until the comparison results are consistent.
In an alternative embodiment, the emission phased composite network includes a first emission phased composite network and a second emission phased composite network, and the receiving phased composite network includes a first receiving phased composite network and a second receiving phased composite network, where, when performing the transmit-receive channel calibration processing: one of the first transmitter and the second transmitter is in an operating state, and the other of the first transmitter and the second transmitter is in an off-line state; one of the first receiver and the second receiver is in an operating state, and the other of the first receiver and the second receiver is in an off-line state; one of the first emission phase control synthesis network and the second emission phase control synthesis network is in a working state, and the other of the first emission phase control synthesis network and the second emission phase control synthesis network is in an off-line state; one of the first and second receiving phased-out networks is in an operational state, and the other of the first and second receiving phased-out networks is in an off-stream state.
In a second aspect, an embodiment of the present application further provides a calibration device for a phased array antenna, where the device includes: the determining module is used for determining a calibration reference antenna for carrying out receiving and transmitting channel calibration processing on the antenna to be calibrated from the phased array antenna, wherein the calibration reference antenna is any one of adjacent antennas of the antenna to be calibrated; the system comprises a link creation module, a calibration module and a calibration module, wherein the link creation module is used for creating a signal transmission link, the signal transmission link comprises a radio frequency signal transmitted by a transmitter, and the radio frequency signal is transmitted to a receiver through a transmission phased composite network, a transmission antenna, a receiving antenna and a receiving phased composite network in sequence, wherein the transmission antenna is one of an antenna to be calibrated and a calibration reference antenna, and the receiving antenna is the other of the antenna to be calibrated and the calibration reference antenna; and the calibration module is used for completing the calibration processing of the receiving and transmitting channels according to the signals received by the receiver and the signals sent by the transmitting phase control synthesis network.
In a third aspect, an embodiment of the present application further provides an electronic device, including: the system comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, the processor and the memory are communicated through the bus when the electronic device is running, and the machine-readable instructions are executed by the processor to perform the steps of the method for calibrating the phased array antenna in the first aspect or any possible implementation manner of the first aspect.
The embodiment of the application provides a calibration method and device for a phased array antenna and electronic equipment, aiming at an antenna to be calibrated in the phased array antenna: determining a calibration reference antenna for carrying out receiving and transmitting channel calibration processing on an antenna to be calibrated, wherein the calibration reference antenna is any one of adjacent antennas of the antenna to be calibrated; and establishing a signal transmission link, wherein the signal transmission link comprises a radio frequency signal transmitted by a transmitter, and is sequentially transmitted to a receiver through a transmitting phase control synthesis network, a transmitting antenna, a receiving antenna and a receiving phase control synthesis network, wherein the transmitting antenna is one of an antenna to be calibrated and a calibration reference antenna, the receiving antenna is the other of the antenna to be calibrated and the calibration reference antenna, and the receiving and transmitting channel calibration processing is completed according to the signal received by a signal receiving device and the signal transmitted by the transmitting phase control synthesis network. The application utilizes the mutual coupling effect between the adjacent antennas of the phased array antenna to finish the calibration of the receiving and transmitting channels of the phased array antenna, reduces the calibration cost and the calibration power consumption, and improves the calibration precision.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art based on embodiments of the application without making any inventive effort, fall within the scope of the application.
The phased array radar is a radar area array composed of a large number of identical radiating units, each radiating unit is independently controlled by a wave control and a phase shifter in terms of phase and amplitude, an accurate and predictable radiation pattern and beam pointing can be obtained, each channel of the phased array radar can show larger amplitude-phase errors due to the influence of consistency of manufacturing processes and mutual coupling of antennas, and if the antenna pattern is not corrected, the problems of antenna pattern distortion, radiation efficiency reduction and the like can be caused, and therefore, the receiving and transmitting channels corresponding to each radiating unit are required to be calibrated, so that the receiving and transmitting performance meets the design requirement.
At present, most manufacturers mainly adopt a periodic far-field calibration or coupling calibration channel calibration method, but for the coupling calibration channel calibration method, a coupling calibration channel is added on hardware to complete the calibration and calibration of a receiving and transmitting channel, so that the complexity of the hardware is increased and the cost is increased, and the periodic far-field calibration increases the calibration power consumption and reduces the reliability of products.
Based on this, the embodiment of the application provides a calibration method, a calibration device and electronic equipment for phased array antennas, which utilize the mutual coupling action between adjacent antennas of the phased array antennas to complete the calibration of a receiving and transmitting channel of the phased array antennas, reduce the calibration cost and the calibration power consumption and improve the calibration precision, and specifically comprises the following steps:
referring to fig. 1, fig. 1 shows a flowchart of a calibration method of a phased array antenna according to an embodiment of the present application. As shown in fig. 1, the method provided by the embodiment of the application is applied to an active phased array radar system, and the following transmit-receive channel calibration processing is performed for an antenna to be calibrated in a phased array antenna:
S100, determining a calibration reference antenna for carrying out receiving and transmitting channel calibration processing on an antenna to be calibrated from the phased array antenna.
The calibration reference antenna is any one of adjacent antennas of the antenna to be calibrated.
S20, establishing a signal transmission link.
The signal transmission link comprises a radio frequency signal transmitted by a transmitter, and the radio frequency signal is transmitted to a receiver through a transmitting phase control synthesis network, a transmitting antenna, a receiving antenna and a receiving phase control synthesis network in sequence, wherein the transmitting antenna is one of an antenna to be calibrated and a calibration reference antenna, and the receiving antenna is the other of the antenna to be calibrated and the calibration reference antenna.
S300, according to the signals received by the receiver and the signals sent by the transmitting phase control synthesis network, the calibration processing of the receiving and transmitting channels is completed.
In a specific implementation, the active phased array radar system comprises a phased array antenna, at least one transmitting phased array synthesis network, at least one receiving phased array synthesis network, at least one transmitter and at least one receiver, wherein the phased array antenna comprises a plurality of radiating units with the same structure, each radiating unit comprises an antenna, a circulator, a transmitting channel and a receiving channel, when the active phased array radar system is used as a signal transmitter, the transmitting channel is opened, a radiation signal emitted by the transmitter sequentially passes through the transmitting phased array synthesis network, the circulator and the antenna to realize outward radiation, and when the active phased array radar system is used as a signal receiver, the receiving channel is opened, and signal receiving is completed through the antenna, the circulator, the receiving channel, the receiving phased array synthesis network and the receiver sequentially.
When the radiation units are used as transmitters, the transmitters generate radio frequency signals required by radar detection, the transmitting phased combination network is responsible for controlling the amplitude and the phase of the radio frequency signals sent by the transmitters and distributing the radio frequency signals to the transmitting channels corresponding to the radiation units to form a transmitting antenna pattern, the transmitting channels at least comprise a power amplifier used for amplifying the power of the radio frequency signals sent by the transmitting phased combination network and sending the radio frequency signals to the circulator, and the circulator transmits the amplified radio frequency signals through corresponding antennas.
When the radiation units are used as a receiver, the circulator receives radio frequency signals and sends the radio frequency signals to a receiving channel, the receiving channel at least comprises a low noise amplifier, the low noise amplifier amplifies the received signals in a low noise mode, the low noise amplifier sends the signals to a receiving phase control synthesis network, and the receiving phase control synthesis network is responsible for receiving signals of the corresponding receiving channels of the radiation units, and sends the signals to the receiver after amplitude phase weighting and combining to obtain a receiving antenna pattern.
In the steps S100-S300, under the condition that a coupling check channel is not additionally added on hardware, the signal mutual coupling effect between adjacent antennas in the linear array antenna is utilized, any one of the adjacent antennas of the antenna to be calibrated is used as a calibration reference antenna, the calibration of a receiving and transmitting channel of the antenna to be calibrated is completed through the mutual coupling principle between the antenna to be calibrated and the calibration reference antenna, and a signal transmission link is mainly established between the antenna to be calibrated and the calibration reference antenna.
Specifically, when the transmitting channel corresponding to the antenna to be calibrated is calibrated, the transmitting channel corresponding to the antenna to be calibrated works, the receiving channel does not work, namely the antenna to be calibrated is used as the transmitting antenna, the receiving channel corresponding to the reference antenna to be calibrated works, namely the reference antenna to be calibrated is used as the receiving antenna, and at the moment, the calibration processing of the transmitting channel corresponding to the antenna to be calibrated is completed according to the signal received by the signal receiving device and the signal sent by the transmitting phase control synthesis network.
Specifically, when the receiving channel corresponding to the antenna to be calibrated is calibrated, the receiving channel corresponding to the antenna to be calibrated works, the transmitting channel does not work, namely the antenna to be calibrated is used as the receiving antenna, the transmitting channel corresponding to the reference antenna to be calibrated works, namely the reference antenna to be calibrated is used as the transmitting antenna, and at the moment, the calibration processing of the receiving channel corresponding to the antenna to be calibrated is completed according to the signal received by the signal receiving device and the signal sent by the transmitting phase control synthesis network.
The calibration of the receiving and transmitting channels of the radiating units is completed, so that the corresponding receiving and transmitting channels of the antennas to be calibrated in the linear array antenna need to be determined and assisted.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a part of a structure of a source phased array radar system according to an embodiment of the application. As shown in fig. 2, the transmission phased synthetic network includes a first transmission phased synthetic network Tb1 and a second transmission phased synthetic network Tb2 that are mutually backup, the reception phased synthetic network includes a first reception phased synthetic network Rb1 and a second reception phased synthetic network Rb2 that are mutually backup, the transmitter includes a first transmitter E1 and a second transmitter E2 that are mutually backup, and the receiver includes a first receiver R1 and a second receiver R2 that are mutually backup.
For the antenna A1 to be calibrated, the antenna C1 is connected to the power amplifier PA1 and the low noise amplifier LNA1, respectively, and the reference antenna A2 corresponding to the antenna A1 to be calibrated is connected to the power amplifier PA2 and the low noise amplifier LNA2, respectively, through the circulator C2.
The power amplifier PA1 is connected to the first transmission phase control synthesis network Tb1 or the second transmission phase control synthesis network Tb2 by a transmission network switching switch TK1, the power amplifier PA2 is connected to the first transmission phase control synthesis network Tb1 or the second transmission phase control synthesis network Tb2 by another transmission network switching switch TK2, and the first transmission phase control synthesis network Tb1 and the second transmission phase control synthesis network Tb2 are connected to the first transmitter E1 or the second transmitter E2 by a transmitter switching switch K1.
The low noise amplifier LNA1 is connected to the first and second receiving phased composite networks Rb1 and Rb2, the low noise amplifier LNA2 is connected to the first and second receiving phased composite networks Rb1 and Rb2, the first receiver R1 is connected to the first phased composite network Rb1 or the transmitter through a receiver switch S1, and the second receiver R2 is connected to the second phased composite network Rb2 or the transmitter through another receiver switch S2.
In a preferred embodiment, the transmitter scaling process is performed prior to the transmit-receive channel scaling process:
Starting a target receiver, wherein the target receiver is one of a first receiver and a second receiver, a first transmitter calibration link is established, the first transmitter calibration link comprises radio frequency signals transmitted by the first transmitter and is transmitted to the target receiver, a first transmission attenuation rate corresponding to the first transmitter is determined according to the radio frequency signals transmitted by the first transmitter and the radio frequency signals received by the receiver, a second transmitter calibration link is established, the second transmitter calibration link comprises radio frequency signals transmitted by the second transmitter and is transmitted to the target receiver, a second transmission attenuation rate corresponding to the second transmitter is determined according to the radio frequency signals transmitted by the second transmitter and the radio frequency signals received by the receiver, the first transmission attenuation rate and the second transmission attenuation rate are compared, if the comparison results are consistent, the transmitter calibration processing is completed, and if the comparison results are inconsistent, the transmission amplitude compensation values and the transmission phase compensation values corresponding to the first transmitter and the second transmitter are adjusted until the comparison results are consistent.
In a specific embodiment, before formally calibrating a transceiver channel corresponding to an antenna to be calibrated, the transmitter needs to be calibrated to ensure accuracy of a subsequent calibration result, specifically, as shown in fig. 2, assuming that a first receiver R1 is used as a target receiver to calibrate the transmitter, at this time, the transmitting network switches TK1 and TK2 are controlled to be in a disconnected state (in suspension), that is, the first transmitting phase control synthesis network Tb1 and the second transmitting phase control synthesis network Tb2 do not work, the subsequent transmitting channel is disconnected, and then:
1a, controlling the transmitter switch K1 to switch on the first transmitter E1, and the receiver switch S1 to switch on the RC1 (controlling the common terminal of the transmitter switch K1), at this time, a first transmitter calibration link between the first transmitter E1 and the first receiver R1 is established, the first transmitter E1 transmits a known radio frequency signal c (t), and obtains a radio frequency signal r_e1 (t) received by the first receiver R1 through the first transmitter calibration link, so as to determine a first transmission attenuation rate h_e1 (t) =r_e1 (t)/c (t).
1B, controlling the transmitter change-over switch K1 to switch on the second transmitter E2, and the receiver switch S1 to switch on the RC1 end, at this time, establishing a second transmitter calibration link between the second transmitter E2 and the first receiver R1, transmitting a known radio frequency signal c (t) to the first receiver R1 by the second transmitter E2 through the second transmitter calibration link, obtaining a radio frequency signal r_e2 (t) received by the first receiver R1, and determining a second transmission attenuation rate h_e2 (t) =r_e2 (t)/c (t).
1C, comparing h_e1 (t) with h_e2 (t), if the difference between h_e1 (t) and h_e2 (t) is within a first preset range, determining that the comparison result is consistent, recording and storing the good phase compensation values respectively corresponding to the first transmitter E1 and the second transmitter E2, wherein the good phase compensation values comprise transmission amplitude compensation values and transmission phase compensation values, directly completing the calibration processing of the first transmitter E1 and the second transmitter E2, if the difference between h_e1 (t) and h_e2 (t) exceeds the first preset range, determining that the comparison result is inconsistent, adjusting the signal transmission amplitude compensation values and the signal transmission phase compensation values corresponding to the first transmitter E1 and the second transmitter E2, and repeatedly executing steps 1 a-1 c each time until the comparison result is consistent.
In another preferred embodiment, the second receiver R2 may be selected as the target receiver, and the receiver switch S2 is only required to be turned on to the RC2 end (to control the common end of the transmitter switch K1) in steps 1a to 1c, so that the good fortune phase calibration of the first transmitter E1 and the second transmitter E2 can be completed, and the specific process is similar to steps 1a to 1c, and will not be repeated here.
In another preferred embodiment, the receiver scaling process is performed before the transmit-receive channel scaling process is performed:
starting a target transmitter, wherein the target transmitter is one of a first transmitter and a second transmitter, a receiver calibration link is established, the receiver calibration link comprises a radio frequency signal transmitted by the transmitter and transmitted to the first receiver and the second receiver respectively, a first receiving attenuation rate corresponding to the first receiver is determined according to the radio frequency signal transmitted by the transmitter and the radio frequency signal received by the first receiver, a second receiving attenuation rate corresponding to the second receiver is determined according to the radio frequency signal transmitted by the transmitter and the radio frequency signal received by the second receiver, the first receiving attenuation rate and the second receiving attenuation rate are compared, if the comparison results are consistent, the receiver calibration processing is completed, and if the comparison results are inconsistent, the signal receiving amplitude and the signal receiving phase corresponding to the first receiver and the second receiver are adjusted until the comparison results are consistent.
In a specific embodiment, before formally calibrating a transceiver channel corresponding to an antenna to be calibrated, the receiver needs to be calibrated to ensure accuracy of a subsequent calibration result, specifically, as shown in fig. 2, assuming that a first transmitter E1 is used as a target transmitter to calibrate the receiver, at this time, the transmitting network switches TK1 and TK2 are controlled to be in a disconnected state (in suspension), that is, the first transmitting phase control synthesis network Tb1 and the second transmitting phase control synthesis network Tb2 do not work, the subsequent transmitting channel is disconnected, and then:
2a, controlling the transmitter switch K1 to switch on the first transmitter E1, the receiver switch S1 to switch on the RC1 end and the receiver switch S2 to switch on the RC2 end, at this time, establishing a receiver calibration link between the first transmitter E1 and the first and second receivers R1 and R2, the first transmitter E1 transmitting a known radio frequency signalAcquiring radio frequency signals/>, received by a first receiver R1 and a second receiver R2 through a receiver calibration link, respectivelyAnd/>Then a first receive decay rate may be determined=/>Second reception attenuation Rate/>=/>。
2B, comparisonAnd/>If/>And/>If the difference between the two is in the second preset range, determining that the comparison results are consistent, recording and storing the good phase compensation values corresponding to the first receiver R1 and the second receiver R2 respectively, directly completing the calibration processing of the first receiver R1 and the second receiver R2, if/>And/>If the difference exceeds the second preset range, determining that the comparison results are inconsistent, adjusting the signal receiving amplitude compensation value and the signal receiving phase compensation value corresponding to the first receiver R1 and the second receiver R2, and repeatedly executing the steps 2 a-2 b each time until the comparison results are consistent.
In another preferred embodiment, the second transmitter E2 may be selected as the target receiver, and the second transmitter E2 may be turned on by the transmitter switch K1 in step 2a, so that the first receiver R1 and the second receiver R2 may be calibrated, and the specific process is similar to steps 2 a-2 b, and will not be repeated here.
In a preferred embodiment, the transmit phased composite network scaling process is performed prior to the transmit receive channel scaling process:
And establishing a signal transmission link by taking the antenna to be calibrated as a transmitting antenna and the calibration reference antenna as a receiving antenna, respectively adjusting the amplitude adjustment quantity and the phase adjustment quantity of the receiving phase control synthesis network aiming at the receiving antenna to a first preset amplitude value and a first preset phase value, recording the signal amplitude and the signal phase received by a receiver, respectively comparing the signal amplitude and the signal phase received by the receiver with the signal amplitude and the signal phase corresponding to the radio frequency signal output by the transmitting phase control synthesis network, if the comparison results are consistent, completing the calibration processing of the transmitting phase control synthesis network, and if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity corresponding to the transmitting phase control synthesis network until the comparison results are consistent.
In a specific embodiment, after the calibration of the receiver is completed, the calibration of the transmit phased composite network is performed, as shown in fig. 2, to exemplify the calibration of the first transmit phased composite network Tb1, which is specifically as follows:
3a, the transmitter change-over switch K1 is connected to the first transmitter E1, the transmitting network change-over switch Tk1 is connected to the first transmitting phase control synthesis network Tb1 through the terminal EC1_1, the transmitting network change-over switch Tk2 is connected to the first transmitting phase control synthesis network Tb1 through the terminal EC1_2, the first receiver R1 is connected to the first receiving phase control synthesis network Rb1 through the receiver switch S1, the receiver switch S2 is suspended, at this time, only the first receiving phase control synthesis network Rb1 and the first receiver R1 work, and the second receiving phase control synthesis network Rb2 and the second receiver R2 do not work.
The first transmit phased combining network Tb1 attenuates the signal output to the power amplifier PA2 through the terminal ec1_2 to 0 (i.e., turns on the transmit channel corresponding to the antenna to be calibrated, turns off the transmit channel corresponding to the reference antenna to be calibrated, and uses the antenna to be calibrated as the transmit antenna), and the first receive phased combining network Rb1 attenuates the input corresponding to the low noise amplifier LNA1 to 0 (i.e., turns off the receive channel corresponding to the antenna to be calibrated, turns on the receive channel corresponding to the reference antenna to be calibrated, and uses the reference antenna to be calibrated as the receive antenna).
The first receiving phased combining network Rb1 adjusts the amplitude adjustment amount and the phase adjustment amount corresponding to the low noise amplifier LNA2 to a first preset amplitude value and a first preset phase value, at this time, the radio frequency signal sent by the first transmitter E1 sequentially completes radiation through the first transmitting phased combining network Tb1, the power amplifier PA1, the circulator C1 and the antenna A1 to be calibrated, and the calibration reference antenna A2 receives the radiation signal sent by the antenna A1 to be calibrated through the mutual coupling effect and sequentially transmits the radiation signal to the first receiver R1 through the circulator C2, the low noise amplifier LNA2 and the first receiving phased combining network Rb 1.
And 3b, respectively comparing the signal amplitude and the signal phase received by the first receiver R1 with the signal amplitude and the signal phase corresponding to the radio frequency signal output by the first transmitting phase control synthesis network Tb1, and if the comparison results are consistent, recording the amplitude adjustment quantity and the phase adjustment quantity of the first transmitting phase control synthesis network Tb1 aiming at the transmitting channel corresponding to the antenna to be calibrated, thereby finishing the output calibration of the first transmitting phase control synthesis network Tb1 on the transmitting channel corresponding to the antenna to be calibrated.
3C, if the signal amplitude received by the first receiver R1 is inconsistent with the signal amplitude output by the first transmission phase control synthesis network Tb1, changing the amplitude output by the first transmission phase control synthesis network Tb1 to the power amplifier PA1 through the terminal ec1_1 according to the preset amplitude nominal value, and returning to execute the step 3b until the signal amplitude received by the first receiver R1 is consistent with the signal amplitude output by the first transmission phase control synthesis network Tb 1.
And 3d, if the phase of the signal received by the first receiver R1 is inconsistent with the phase of the signal output by the first emission phase control synthesis network Tb1, changing the phase of the signal output by the first emission phase control synthesis network Tb1 to the power amplifier PA1 through the terminal ec1_1 according to the preset phase nominal value, and returning to execute the step 3b until the phase of the signal received by the first receiver R1 is consistent with the phase of the signal output by the first emission phase control synthesis network Tb 1.
In another preferred embodiment, in the steps 3a to 3d, the second transmitter E2 may be used instead of the first transmitter E1, or the second receiver R2 may be used instead of the first receiver R1.
Alternatively, in step 3a to step 3d, the power amplifier PA1 may be connected to the terminal ec2_1 through the transmission network switching switch TK1 to access the second transmission phase control synthesis network Tb2, the power amplifier PA2 may be connected to the terminal ec2_2 (or may be suspended) through the transmission network switching switch TK2, so that the power amplifier PA2 is connected to the second transmission phase control synthesis network Tb2, and at this time, the second transmission phase control synthesis network Tb2 is used to replace the first transmission phase control synthesis network Tb1, so that the amplitude and the phase of the corresponding transmission channel of the antenna to be calibrated may be calibrated by outputting the second transmission phase control synthesis network Tb2 to the terminal ec2_1.
In a preferred embodiment, the calibration process of the receive phased composite network is performed prior to the transmit-receive channel calibration process:
And establishing a signal transmission link by taking the antenna to be calibrated as a receiving antenna and the calibration reference antenna as a transmitting antenna, respectively adjusting the amplitude adjustment quantity and the phase adjustment quantity of the transmitting phase control synthesis network aiming at the transmitting antenna to a second preset amplitude value and a second preset phase value, recording the signal amplitude and the signal phase received by a receiver, respectively comparing the signal amplitude and the signal phase received by the receiver with the signal amplitude and the signal phase of a radio frequency signal input by the transmitting phase control synthesis network, if the comparison results are consistent, completing the calibration processing of the receiving phase control synthesis network, and if the comparison results are inconsistent, changing the amplitude adjustment quantity and the phase adjustment quantity of the receiving phase control synthesis network aiming at the receiving antenna until the comparison results are consistent.
In a specific embodiment, after the calibration of the receiver is completed, the calibration of the receiving phased composite network is further performed, as shown in fig. 2, to exemplify the calibration of the first receiving phased composite network Rb1, which is specifically as follows:
4a, controlling the transmitter switching switch K1 to switch on the target transmitter (the target transmitter is the first transmitter E1 or the second transmitter E2), the transmitting network switching switch Tk1 switches on the first target terminal (the first target terminal is the terminal ec1_1 or the terminal ec2_1), and the transmitting network switching switch Tk2 switches on the second target terminal (the second target terminal is the terminal ec2_1 or the terminal ec2_2), so that the power amplifiers PA1 and PA2 switch on the target transmitting phase control synthesis network (the target transmitting phase control synthesis network is the first transmitting phase control synthesis network Tb1 or the second transmitting phase control synthesis network Tb 2), and the first target terminal and the second target terminal access the same transmitting phase control synthesis network.
The target receiver (the first receiver or the second receiver) is connected to the target receiving phased composite network through a corresponding receiver switch (the target receiving phased composite network may be the first receiving phased composite network Rb1 or the second receiving phased composite network Rb 2), and the target receiver corresponds to the target receiving phased composite network.
The target transmit phase control synthesis network attenuates the signal output to the power amplifier PA2 through the second target terminal to 0 (i.e., turns on the transmit channel corresponding to the antenna to be calibrated, turns off the transmit channel corresponding to the reference antenna to be calibrated, uses the antenna to be calibrated as the transmit antenna), and the target receive phase control synthesis network attenuates the input corresponding to the low noise amplifier LNA1 to 0 (i.e., turns off the receive channel corresponding to the antenna to be calibrated, turns on the receive channel corresponding to the reference antenna to be calibrated, and uses the reference antenna to be calibrated as the receive antenna).
And adjusting the amplitude adjustment amount and the phase adjustment amount corresponding to the target transmitting phase control synthesis network to a second preset amplitude value and a second preset phase value, and keeping unchanged, wherein at the moment, a radio frequency signal sent by the target transmitter sequentially completes radiation outwards through the target transmitting phase control synthesis network, the power amplifier PA1, the circulator C1 and the antenna A1 to be calibrated, the calibration reference antenna A2 receives a radiation signal sent by the antenna A1 to be calibrated through the mutual coupling effect, and sequentially passes through the circulator C2, the low noise amplifier LNA2 and the target receiving phase control synthesis network to be transmitted to a target receiver corresponding to the target receiving phase control synthesis network.
4B, comparing the signal amplitude and the signal phase received by the target receiver with the signal amplitude and the signal phase corresponding to the radio frequency signal output by the target transmitting phase control synthesis network respectively, if the comparison results are consistent, recording the amplitude adjustment quantity and the phase adjustment quantity of the target receiving phase control synthesis network corresponding to the receiving channel of the calibration reference antenna, and finishing the output calibration of the target phase control synthesis network corresponding to the receiving channel of the calibration reference antenna.
4C, if the signal amplitude received by the target receiver is inconsistent with the signal amplitude output by the target transmitting phase control synthesis network, changing the amplitude output by the target receiving phase control synthesis network to the target receiver according to a preset amplitude nominal value, and returning to execute the step 4b until the signal amplitude received by the target receiver is consistent with the signal amplitude output by the target transmitting phase control synthesis network.
4D, if the phase of the signal received by the target receiver is inconsistent with the phase of the signal output by the target transmitting phase control synthesis network, changing the phase of the signal output by the target receiving phase control synthesis network to the target receiver according to a preset phase nominal value, and returning to the step 4b until the phase of the signal received by the target receiver is consistent with the phase of the signal output by the target transmitting phase control synthesis network.
Alternatively, in step 4a to step 4d, the target transmit phase control synthesis network may attenuate the signal output to the power amplifier PA1 through the first target terminal to 0 (i.e., close the transmit channel corresponding to the antenna to be calibrated, open the transmit channel corresponding to the calibration reference antenna, and use the calibration reference antenna as the transmit antenna), and the target receive phase control synthesis network attenuates the input corresponding to the low noise amplifier LNA2 to 0 (i.e., close the receive channel corresponding to the calibration reference antenna, open the receive channel corresponding to the antenna to be calibrated, and use the antenna to be calibrated as the receive antenna), where, in this case, the calibration of the amplitude and phase adjustment amount of the target receive phase control synthesis network corresponding to the receive channel of the antenna to be calibrated may be completed through step 4a to step 4 d.
In a preferred embodiment, the transmit-receive channel calibration process comprises a transmit channel calibration process, the signal transmission link comprises a first transmit channel calibration link and a second transmit channel calibration link, wherein the transmit channel calibration process for the antenna to be calibrated is accomplished by: the method comprises the steps of creating a first transmitting channel calibration link, wherein the first transmitting component calibration link comprises a transmitting channel corresponding to a transmitting antenna, a transmitting channel corresponding to a receiving antenna, a receiving channel corresponding to a reflecting target, a calibrating reference antenna and a receiving channel corresponding to a calibrating reference antenna, which are sequentially transmitted by a transmitter through a transmitting phase control synthesis network, the transmitting channel corresponding to the transmitting antenna, the receiving channel corresponding to the receiving phase control synthesis network, the receiving antenna, a reflecting target, the receiving channel corresponding to the receiving antenna and the receiving phase control synthesis network, which are sequentially transmitted to a receiver, the receiving channel corresponding to the receiving antenna, the receiving channel corresponding to the receiving signal is compared with the receiving phase corresponding to the receiving phase of the receiving signal, and if the comparing result is consistent, the transmitting channel calibration processing of the receiving antenna is completed, and if the comparing result is inconsistent, the amplitude adjustment quantity and the adjustment quantity of the transmitting channel corresponding to the receiving antenna are changed, and if the comparing result is inconsistent.
In a specific embodiment, as shown in fig. 2, under the condition that the receiving channel is fixed, the power amplifiers PA1 and PA2 are sequentially selected to perform signal transmission, and according to the comparison receiving result, the amplitude and the phase of the transmitting channel ttb_a1 (the antenna A1 to be calibrated, the circulator C1, the power amplifier PA 1) corresponding to the antenna to be calibrated and the transmitting channel ttb_a2 (the calibrating reference antenna A2, the circulator C2, the power amplifier PA 2) corresponding to the calibrating reference antenna can be calibrated.
Specifically, as shown in fig. 2, the transmitter switch K1 is switched to the target transmitter (E1 or E2), the transmitting network switches TK1 and TK2 are switched to the target transmitting phased composite network (Tb 1 or Tb 2), the output of the power amplifier PA2 by the target transmitting phased composite network is attenuated to 0, the receiver switch S1 or the receiver switch S2 is closed, so that the target receiver (R1 or R2) is connected to the corresponding target phased receiving network (Rb 1 or Rb 2), and then, a first transmitting channel calibration link is formed, including: the radio frequency signal transmitted by the target transmitter is sequentially transmitted to a target receiver corresponding to the target receiving phase control synthesis network through the target transmitting phase control synthesis network, the power amplifier PA1, the antenna A1 to be calibrated, a reflecting target (not shown in the figure), the calibration reference antenna A2, the low noise amplifier LAN2 and the target receiving phase control synthesis network, and the first receiving signal received by the target receiver is recorded.
Then maintaining the output of the target transmitter, attenuating the output of the target transmitting phase-controlled synthesis network to the power amplifier PA1 to 0, and recovering the output of the target transmitting phase-controlled synthesis network to the power amplifier PA2 to form a second transmitting channel calibration link, comprising: the radio frequency signal transmitted by the target transmitter (E1 or E2) is sequentially transmitted to the corresponding target receiver through the target transmitting phased composite network (Tb 1 or Tb 2), the power amplifier PA2, the calibration reference antenna A2, the reflecting target (not shown in the figure), the antenna A1 to be calibrated, the low noise amplifier LAN1 and the target receiving phased composite network, and the second received signal received by the target receiver is recorded.
And comparing the amplitude and the phase corresponding to the first receiving signal with the amplitude and the phase corresponding to the second receiving signal, and if the amplitude corresponding to the first receiving signal is consistent with the amplitude corresponding to the second receiving signal and the phase corresponding to the first receiving signal is consistent with the phase corresponding to the second receiving signal, recording the amplitude and phase adjustment quantity of the transmitting channel corresponding to the antenna to be calibrated, and completing the calibration processing of the transmitting channel of the antenna to be calibrated.
And if the phase corresponding to the first receiving signal is inconsistent with the phase corresponding to the second receiving signal, adjusting the phase adjustment quantity of the transmitting channel corresponding to the antenna to be calibrated until the amplitude is consistent.
The transceiver channel calibration process further comprises a receive channel calibration process, the signal transmission link comprises a receive channel calibration link, and in a preferred embodiment, the receive channel calibration process for the antenna to be calibrated is accomplished by:
Creating a receive channel calibration link, comprising: the radio frequency signals transmitted by the transmitter are sequentially transmitted to the receiver through the transmitting phase control synthesis network, the transmitting channel corresponding to the transmitting antenna, the reflecting target, the receiving antenna, the receiving channel and the receiving phase control synthesis network, the third receiving signal received by the receiver through the receiving channel calibration link and the fourth receiving signal received by the calibration reference antenna are recorded, the signal amplitude and the signal phase of the third receiving signal are respectively compared with the signal amplitude and the signal phase of the fourth receiving signal, if the comparison results are consistent, the calibration processing of the receiving channel of the antenna to be calibrated is completed, and if the comparison results are inconsistent, the amplitude adjustment amount and the phase adjustment amount corresponding to the receiving channel of the antenna to be calibrated are changed until the comparison results are consistent.
In a specific embodiment, as shown in fig. 2, the transmitter switch K1 is switched to the target transmitter (E1 or E2), the transmitting network switches TK1 and TK2 are switched to the target transmitting phased composite network (Tb 1 or Tb 2), the output of the target transmitting phased composite network to the target power amplifier (PA 1 or PA 2) is maintained, the output of the target transmitting phased composite network to the other power amplifier except the target power amplifier is attenuated to 0, the receiver switch S1 and the receiver switch S2 are all closed so that the receiver R1 is connected to the first phased receiving network Rb1, the receiver R2 is connected to the second phased receiving network Rb2, the first phased receiving network Rb1 is attenuated to 0 to the received signal from the low noise amplifier LAN2, the second phased receiving network Rb2 is attenuated to 0 to the received signal from the low noise amplifier LAN1, and then, a receiving channel link is formed, which includes: the radio frequency signal emitted by the target transmitter completes signal radiation sequentially through the target emission phase control synthesis network, the target power amplifier, the antenna A1 to be calibrated, the reflecting target (not shown in the figure), the reflected signal is transferred to the second receiver R2 through the calibration reference antenna A2, the low noise amplifier LAN2 and the second receiving phase control synthesis network Rb2, and the reflected signal is transferred to the first receiver R1 through the reference antenna A1 to be calibrated, the low noise amplifier LAN1 and the first receiving phase control synthesis network Rb 1.
Recording a third receiving signal (corresponding to an antenna receiving channel to be calibrated) received by the first receiver R1 and a fourth receiving signal (corresponding to a reference antenna receiving channel to be calibrated) received by the second receiver R2, and comparing the signal amplitude and the signal phase of the third receiving signal with those of the fourth receiving signal on the assumption that the amplitude and phase adjustment quantity corresponding to the reference antenna receiving channel to be calibrated is a rated value;
If the comparison result is consistent, the amplitude and phase adjustment quantity corresponding to the receiving channel of the antenna A1 to be calibrated is recorded, the calibration processing of the receiving channel of the antenna to be calibrated is completed, if the signal amplitude of the third receiving signal is inconsistent with the signal amplitude of the fourth receiving signal, the amplitude adjustment quantity corresponding to the receiving channel of the antenna to be calibrated is changed until the comparison result is consistent, and if the signal phase of the third receiving signal is inconsistent with the signal phase of the fourth receiving signal, the phase adjustment quantity corresponding to the receiving channel of the antenna to be calibrated is changed until the comparison result is consistent.
In another preferred embodiment, alternatively, during the process of calibrating the receiving channel of the antenna A1 to be calibrated, the first receiver R1 (the first receiving phased combining network Rb1 is enabled) may be used to receive the echo signals of the RA1_rb (the antenna A1 to be calibrated, the circulator C1, and the LNA 1) and then the second receiver R2 (the second receiving phased combining network Rb2 is enabled) may be used to receive the echo signals of the RA2_rb (the calibration reference antenna A2, the circulator C2, and the LNA 2), and the time-sharing received echo signals may be compared.
Based on the same application conception, the embodiment of the application also provides a calibration device based on the phased array antenna, which corresponds to the calibration method based on the phased array antenna provided by the embodiment, and because the principle of solving the problem of the device in the embodiment of the application is similar to that of the calibration method based on the phased array antenna provided by the embodiment of the application, the implementation of the device can refer to the implementation of the method, and the repetition is omitted.
Referring to fig. 3, fig. 3 shows a functional block diagram of a calibration device for a phased array antenna according to an embodiment of the present application. As shown in fig. 3, the apparatus includes:
The determining module 400 is configured to determine a calibration reference antenna for performing a transmit-receive channel calibration process on an antenna to be calibrated from the phased array antenna, where the calibration reference antenna is any one of adjacent antennas of the antenna to be calibrated.
The link creation module 410 is configured to create a signal transmission link, where the signal transmission link includes a radio frequency signal transmitted by a transmitter and is sequentially transmitted to a receiver through a transmission phased composite network, a transmission antenna, a receiving antenna, and a receiving phased composite network, where the transmission antenna is one of an antenna to be calibrated and a calibration reference antenna, and the receiving antenna is the other of the antenna to be calibrated and the calibration reference antenna.
And the calibration module 420 is configured to complete the calibration process of the transceiver channel according to the signal received by the receiver and the signal sent by the transmitting phase control synthesis network.
Based on the same application concept, please refer to fig. 4, fig. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 4, the electronic device 500 includes: processor 510, memory 520, and bus 530, memory 520 storing machine-readable instructions executable by processor 510, the machine-readable instructions being in communication with memory 520 via bus 530 when electronic device 500 is in operation, the machine-readable instructions being executed by processor 510 to perform the steps of a method of calibrating a phased array antenna as provided in any of the embodiments described above.
Based on the same application conception, the embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program executes the steps of the phased array antenna calibration method provided by the embodiment when being executed by a processor.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again. In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.