技术领域technical field
本发明涉及一种剩余响应抑制方法，尤其涉及一种基于硬件电路的主动式剩余响应抑制方法，属于测试技术领域。The invention relates to a residual response suppression method, in particular to a hardware circuit-based active residual response suppression method, which belongs to the technical field of testing.
背景技术Background technique
对于通用的超外差信号接收机，剩余响应是其最基本的一个性能指标，它表征了该接收机在没有外部信号输入的情况下接收机本身假响应幅值的大小，限制了在剩余响应频率点上的最小测试电平和测量准确度。一般为保证整机剩余响应指标的实现，需要对变频通路进行优化布局、器件选型、通道隔离、波段滤波等各种通道处理设计。随着该指标的不断提升，一味的依靠传统的硬件模拟电路保证指标的实现，不仅电路实现复杂，体积庞大，成本高昂，而且稳定性和可靠性都不易保证。For a general-purpose superheterodyne signal receiver, the residual response is the most basic performance index, which characterizes the magnitude of the false response amplitude of the receiver itself when there is no external signal input, limiting the residual response Minimum test level and measurement accuracy at frequency points. Generally, in order to ensure the realization of the remaining response indicators of the whole machine, various channel processing designs such as optimized layout, device selection, channel isolation, and band filtering need to be carried out on the frequency conversion channel. With the continuous improvement of this index, blindly relying on traditional hardware analog circuits to ensure the realization of the index, not only the circuit implementation is complicated, the volume is large, the cost is high, but also the stability and reliability are not easy to guarantee.
在通用的多级超外差接收机实现方案中，两路本振信号之间相互作用产生的带内高阶交调信号即为整机的一种剩余响应点，由于本振信号功率较大，变频器本身端口间隔离度有限，由此产生的剩余响应是接收机最难以解决的顽疾，已成为整机剩余响应指标提高的瓶颈因素。现有的解决方案完全依靠混频器本身的端口隔离度、通路中的带通滤波或低通滤波器的带外抑制能力以及变频通道本身空间隔离屏蔽设计性能。要想降低剩余相应指标，主要靠减小滤波器过度带、提高滤波器带外抑制，一般是增加滤波器阶数或采用多个滤波器串联方式来实现，这无疑会增加体积和成本，而且会影响通路损耗，降低整机测量灵敏度。新增加的滤波器电路对杂波信号抑制有限，且需要考虑跟原电路的匹配等因素，加上本身随温度、湿度等外界环境影响容易发生漂移导致滤波抑制效果大打折扣，稳定性和可靠性较差。In the general multi-stage superheterodyne receiver implementation scheme, the in-band high-order intermodulation signal generated by the interaction between the two local oscillator signals is a residual response point of the whole machine. Due to the large power of the local oscillator signal , The isolation between the ports of the inverter itself is limited, and the resulting residual response is the most difficult problem for the receiver, and has become a bottleneck factor for the improvement of the residual response index of the whole machine. Existing solutions rely entirely on the port isolation of the mixer itself, the out-of-band rejection capability of the band-pass filter or low-pass filter in the channel, and the spatial isolation and shielding design performance of the frequency conversion channel itself. In order to reduce the remaining corresponding indicators, it is mainly to reduce the excessive band of the filter and improve the out-of-band rejection of the filter, which is generally achieved by increasing the order of the filter or using multiple filters in series, which will undoubtedly increase the volume and cost, and It will affect the path loss and reduce the measurement sensitivity of the whole machine. The newly added filter circuit has limited suppression of clutter signals, and factors such as matching with the original circuit need to be considered. In addition, it is prone to drift with external environmental influences such as temperature and humidity, resulting in a greatly reduced filter suppression effect, stability and reliability. poor.
发明内容Contents of the invention
本发明的目的在于提供一种基于硬件电路的主动式剩余响应抑制方法，设计合理，克服了现有技术的不足，降低了剩余响应指标，提高了剩余响应点附近的测量范围和精确度。The object of the present invention is to provide an active residual response suppression method based on a hardware circuit, which has a reasonable design, overcomes the shortcomings of the prior art, reduces the residual response index, and improves the measurement range and accuracy near the residual response point.
为解决上述技术问题，本发明采用以下技术方案予以实现：In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to achieve:
一种基于硬件电路的主动式剩余响应抑制方法，A hardware circuit-based active residual response suppression method,
具有以下硬件电路：预选器、本地振荡器、第一耦合器、第二耦合器、混频器、幅相控制器和中频通道；It has the following hardware circuits: preselector, local oscillator, first coupler, second coupler, mixer, amplitude and phase controller and intermediate frequency channel;
所述本地振荡器产生本振信号，经第一耦合器输出至混频器，所述预选器选择射频输入信号至混频器，混频器将第一耦合器输出的本振信号和预选器选择的射频输入信号进行变频，得到中频信号和本振泄露信号及其他小信号；The local oscillator generates a local oscillator signal, which is output to the mixer through the first coupler, and the preselector selects the radio frequency input signal to the mixer, and the mixer combines the local oscillator signal output by the first coupler with the preselector Convert the selected RF input signal to obtain intermediate frequency signal, local oscillator leakage signal and other small signals;
所述幅相控制器对第一耦合器输出的本振信号进行调幅调相，得到调谐信号；The amplitude and phase controller performs amplitude modulation and phase modulation on the local oscillator signal output by the first coupler to obtain a tuning signal;
调谐信号经第二耦合器输出至中频通道，抵消掉中频通道中的本振泄露信号，得到中频信号及其他小信号；The tuning signal is output to the intermediate frequency channel through the second coupler, and the local oscillator leakage signal in the intermediate frequency channel is offset to obtain the intermediate frequency signal and other small signals;
利用以上硬件电路的主动式剩余响应抑制方法，包括以下步骤：The active residual response suppression method utilizing the above hardware circuit comprises the following steps:
步骤1：本地振荡器产生本振信号至第一耦合器；Step 1: the local oscillator generates a local oscillator signal to the first coupler;
步骤2：第一耦合器输出本振信号至混频器；Step 2: the first coupler outputs the local oscillator signal to the mixer;
步骤3：预选器选择射频输入信号至混频器；Step 3: The preselector selects the RF input signal to the mixer;
步骤4：混频器将第一耦合器输出的本振信号和预选器选择的射频输入信号进行变频，得到中频信号和本振泄露信号及其他小信号至第二耦合器；Step 4: The mixer converts the local oscillator signal output by the first coupler and the radio frequency input signal selected by the preselector to obtain an intermediate frequency signal, local oscillator leakage signal and other small signals to the second coupler;
步骤5：第一耦合器输出本振信号至幅相控制器；Step 5: the first coupler outputs the local oscillator signal to the amplitude and phase controller;
步骤6：幅相控制器对第一耦合器输出的本振信号进行调幅调相，得到调谐信号至第二耦合器；Step 6: The amplitude and phase controller performs amplitude modulation and phase modulation on the local oscillator signal output by the first coupler, and obtains a tuning signal to the second coupler;
步骤7：在第二耦合器中，本振泄露信号和调谐信号幅度相等，相位相反，本振泄露信号和调谐信号完全抵消，得到中频信号及其他小信号至中频通道。Step 7: In the second coupler, the leakage signal of the local oscillator is equal to the amplitude of the tuning signal, and the phase is opposite. The leakage signal of the local oscillator and the tuning signal are completely canceled, and the intermediate frequency signal and other small signals are sent to the intermediate frequency channel.
优选地，所述幅相控制器采用现场可编程门阵列，用于幅相调节。Preferably, the amplitude and phase controller adopts a field programmable gate array for amplitude and phase adjustment.
优选地，所述中频通道包括放大器和带通滤波器。Preferably, the intermediate frequency channel includes an amplifier and a bandpass filter.
本发明的有益效果是：本发明一种基于硬件电路的主动式剩余响应抑制方法，设计合理，增加了辅助信号通道，但是不增加变频通道损耗，不影响整机测量灵敏度，稳定可靠。采用数字化调节控制技术，可根据测试需要对当前剩余响应点进行实时校准，降低了剩余响应指标，提高了剩余响应点附近的测量范围和精确度。The beneficial effects of the present invention are: an active residual response suppression method based on a hardware circuit of the present invention has a reasonable design, increases auxiliary signal channels, but does not increase frequency conversion channel loss, does not affect the measurement sensitivity of the whole machine, and is stable and reliable. Using digital adjustment control technology, the current remaining response points can be calibrated in real time according to the test needs, which reduces the remaining response indicators and improves the measurement range and accuracy near the remaining response points.
附图说明Description of drawings
图1为本发明一种基于硬件电路的主动式剩余响应抑制方法的原理图。FIG. 1 is a schematic diagram of an active residual response suppression method based on a hardware circuit according to the present invention.
图2为本发明一种基于硬件电路的主动式剩余响应抑制方法的流程框图。FIG. 2 is a flow chart of an active residual response suppression method based on a hardware circuit according to the present invention.
具体实施方式Detailed ways
下面结合附图1和附图2对本发明进行举例说明。The present invention is illustrated below in conjunction with accompanying drawing 1 and accompanying drawing 2.
如图1所述，本发明一种基于硬件电路的主动式剩余响应抑制方法的原理图，As shown in Figure 1, a schematic diagram of an active residual response suppression method based on a hardware circuit of the present invention,
具有以下硬件电路：预选器、本地振荡器、第一耦合器、第二耦合器、混频器、幅相控制器和中频通道；It has the following hardware circuits: preselector, local oscillator, first coupler, second coupler, mixer, amplitude and phase controller and intermediate frequency channel;
所述本地振荡器产生本振信号，经第一耦合器输出至混频器，所述预选器选择射频输入信号至混频器，混频器将第一耦合器输出的本振信号和预选器选择的射频输入信号进行变频，得到中频信号和本振泄露信号及其他小信号；The local oscillator generates a local oscillator signal, which is output to the mixer through the first coupler, and the preselector selects the radio frequency input signal to the mixer, and the mixer combines the local oscillator signal output by the first coupler with the preselector Convert the selected RF input signal to obtain intermediate frequency signal, local oscillator leakage signal and other small signals;
所述幅相控制器对第一耦合器输出的本振信号进行调幅调相，得到调谐信号；The amplitude and phase controller performs amplitude modulation and phase modulation on the local oscillator signal output by the first coupler to obtain a tuning signal;
调谐信号经第二耦合器输出至中频通道，抵消掉中频通道中的本振泄露信号，得到中频信号及其他小信号；The tuning signal is output to the intermediate frequency channel through the second coupler, and the local oscillator leakage signal in the intermediate frequency channel is offset to obtain the intermediate frequency signal and other small signals;
利用以上硬件电路的主动式剩余响应抑制方法(如图2所示)，包括以下步骤：The active residual response suppression method (as shown in Figure 2) utilizing the above hardware circuit comprises the following steps:
步骤1：本地振荡器产生本振信号至第一耦合器；Step 1: the local oscillator generates a local oscillator signal to the first coupler;
步骤2：第一耦合器输出本振信号至混频器；Step 2: the first coupler outputs the local oscillator signal to the mixer;
步骤3：预选器选择射频输入信号至混频器；Step 3: The preselector selects the RF input signal to the mixer;
步骤4：混频器将第一耦合器输出的本振信号和预选器选择的射频输入信号进行变频，得到中频信号和本振泄露信号及其他小信号至第二耦合器；Step 4: The mixer converts the local oscillator signal output by the first coupler and the radio frequency input signal selected by the preselector to obtain an intermediate frequency signal, local oscillator leakage signal and other small signals to the second coupler;
步骤5：第一耦合器输出本振信号至幅相控制器；Step 5: the first coupler outputs the local oscillator signal to the amplitude and phase controller;
步骤6：幅相控制器对第一耦合器输出的本振信号进行调幅调相，得到调谐信号至第二耦合器；Step 6: The amplitude and phase controller performs amplitude modulation and phase modulation on the local oscillator signal output by the first coupler, and obtains a tuning signal to the second coupler;
步骤7：在第二耦合器中，本振泄露信号和调谐信号幅度相等，相位相反，本振泄露信号和调谐信号完全抵消，得到中频信号及其他小信号至中频通道。Step 7: In the second coupler, the leakage signal of the local oscillator is equal to the amplitude of the tuning signal, and the phase is opposite. The leakage signal of the local oscillator and the tuning signal are completely canceled, and the intermediate frequency signal and other small signals are sent to the intermediate frequency channel.
优选地，所述幅相控制器采用现场可编程门阵列，用于幅相调节。Preferably, the amplitude and phase controller adopts a field programmable gate array for amplitude and phase adjustment.
优选地，所述中频通道包括放大器和带通滤波器。Preferably, the intermediate frequency channel includes an amplifier and a bandpass filter.
当然，上述说明并非是对本发明的限制，本发明也并不仅限于上述举例，本技术领域的技术人员在本发明的实质范围内所做出的变化、改型、添加或替换，也应属于本发明的保护范围。Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410570703.8ACN104300996A (en) | 2014-10-23 | 2014-10-23 | An Active Residual Response Suppression Method Based on Hardware Circuit |
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| CN201410570703.8ACN104300996A (en) | 2014-10-23 | 2014-10-23 | An Active Residual Response Suppression Method Based on Hardware Circuit |
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| CN104300996Atrue CN104300996A (en) | 2015-01-21 |
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| CN201410570703.8APendingCN104300996A (en) | 2014-10-23 | 2014-10-23 | An Active Residual Response Suppression Method Based on Hardware Circuit |
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