CN115561743A - Nonlinear node detection method and detector - Google Patents
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/04—Systems determining presence of a target
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
Description
Technical Field
The invention belongs to the technical field of nonlinear node detectors, and particularly relates to a nonlinear node detection method and a detector.
Background
In the prior art, a nonlinear node detector has a transmitting unit (TX) and a receiving unit (RX), a detection signal is transmitted through an antenna, if a nonlinear node exists in the coverage area of the antenna, a harmonic signal is generated, the harmonic signal is received by the receiving unit, and whether the nonlinear node exists in the detected area can be indicated according to the strength of the received harmonic signal, and the method is used for searching for hidden electronic products (generally, eavesdropping devices).
When the existing nonlinear node detector is used in practice, a hidden nonlinear node needs to be found by searching a detected area in a back-and-forth scanning mode, and scanning type searching needs more time and has the risk of missing scanning for an area with a larger area.
Disclosure of Invention
In order to solve the problems of the prior art, an object of the present invention is to provide a method and a detector for detecting a nonlinear node, which can quickly and accurately find out a direction or a position of a nonlinear node.
In order to achieve the above object, the present invention provides a nonlinear node detection method, wherein the detector comprises a transmitting unit and at least two receiving units, and the method comprises the following steps:
s1, a receiving unit is arranged at different positions, a transmitting unit transmits detection signals, and if nonlinear nodes exist in a detection range, the receiving unit receives harmonic signals fed back by the nonlinear nodes and acquires phase data of different harmonic signals; if the nonlinear node does not exist, the receiving unit cannot receive the harmonic signal;
and S2, calculating the phase difference of the receiving signals of every two receiving units, and obtaining the direction angle of the nonlinear node according to the phase difference and the distance between the receiving units.
Further, in step S2, the method for calculating the direction angle of the nonlinear node includes: the phases of the received signals of the two receiving units are respectively PH1 And pH2 Phase difference Δ PH = PH between them1 -PH2 (ii) a The wavelength of the known harmonic signal is lambda, and the distance between the two receiving units is S; the distance difference of the harmonic signal to two receiving units is d, then
The direction angle of the non-linear junction
Further, in step S1, the receiving unit includes a first receiving unit, a second receiving unit and a third receiving unit, which are located at the vertex of the right triangle, and the second receiving unit is located at the vertex of the right angle.
Further, in step S2, a vertical pitch angle of the nonlinear node is obtained according to a distance and a phase difference between the first receiving unit and the second receiving unit; and obtaining the horizontal deflection angle of the nonlinear node according to the distance and the phase difference between the second receiving unit and the third receiving unit.
Furthermore, the receiving unit further includes a fourth receiving unit, the first receiving unit, the second receiving unit, the third receiving unit and the fourth receiving unit are respectively located at four vertices of the rectangle, the first receiving unit and the third receiving unit are located at diagonal vertices of the rectangle, and the second receiving unit and the fourth receiving unit are located at diagonal vertices of the rectangle.
Further, the phase difference between the first receiving unit and the fourth receiving unit and the phase difference between the second receiving unit and the third receiving unit are averaged, and then the horizontal deflection angle of the nonlinear node is obtained by combining the distance; and averaging the phase difference between the second receiving unit and the first receiving unit and the phase difference between the third receiving unit and the fourth receiving unit, and combining the distances to obtain the vertical pitch angle of the nonlinear node.
Further, in step S1, the receiving unit includes a first receiving unit, a second receiving unit, a third receiving unit, and a fourth receiving unit, and a connection line between the first receiving unit and the third receiving unit is perpendicular to a connection line between the second receiving unit and the fourth receiving unit.
Further, in step S2, a horizontal deflection angle of the nonlinear node is obtained according to a distance and a phase difference between the first receiving unit and the third receiving unit; and obtaining the vertical pitch of the nonlinear node according to the distance and the phase difference between the second receiving unit and the fourth receiving unit.
Furthermore, the receiving unit further comprises a fourth receiving unit, the plane where the first receiving unit, the second receiving unit and the third receiving unit are located is a reference plane, the fourth receiving unit is located above or below the reference plane, and the distance from the nonlinear node to the reference plane is obtained according to the vertical pitch angle, the phase difference and the vertical distance between the fourth receiving unit and the third unit, and the distance from the fourth receiving unit to the reference plane.
The invention also provides a nonlinear node detector, which applies the nonlinear node detection method and comprises the following steps:
a transmitting unit for transmitting a probe signal;
the receiving units are provided with at least two receiving units and are used for receiving second harmonic signals fed back by the nonlinear nodes;
the data processing unit is used for calculating and processing the azimuth data of the nonlinear node;
after the transmitting unit transmits the detection signal, if the nonlinear node exists in the range, the receiving unit acquires phase data of a second harmonic signal fed back by the nonlinear node, and the data processing unit calculates and obtains azimuth data of the nonlinear node according to the phase data and the distance of the receiving unit.
Compared with the prior art, the invention has the beneficial effects that: when the hidden electronic equipment with the nonlinear nodes is searched and detected, if the nonlinear nodes exist in the searching range, the direction and the position of the hidden nonlinear nodes in the detected area can be quickly obtained according to the phase difference of harmonic signals received by the plurality of receiving units, the searching operation does not need to be carried out back and forth, the searching operation time is saved, and the detecting efficiency and the detecting accuracy of the nonlinear node detector are improved.
Drawings
FIG. 1 is a first schematic diagram of angle measurement according to a first embodiment of the present invention;
FIG. 2 is a second schematic angle measurement diagram according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a first two-dimensional angle measurement method according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a second two-dimensional angle measurement method according to a first embodiment of the invention;
FIG. 5 is a schematic diagram of a two-dimensional angle measurement method III according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a first three-dimensional angle measurement method according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram of a three-dimensional angle measurement method according to a first embodiment of the present invention;
fig. 8 is a structural connection diagram of a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
the embodiment of the invention provides a nonlinear node detection method, wherein a detector comprises a transmitting unit TX and at least two receiving units RX, and the method comprises the following steps:
s1, a receiving unit RX is arranged at different positions, a transmitting unit TX transmits a detection signal, and if a nonlinear node exists in a detection range, the receiving unit RX receives a harmonic signal fed back by the nonlinear node and acquires phase data of different harmonic signals; if there is no nonlinear node, the receiving unit RX does not receive the harmonic signal;
and S2, calculating the phase difference of the receiving signals of every two receiving units RX, and obtaining the direction angle of the nonlinear node according to the phase difference and the distance between the receiving units RX.
Therefore, when the hidden electronic equipment with the nonlinear nodes is searched and detected, if the nonlinear nodes exist in the searching range, the direction and the position of the hidden nonlinear nodes in the detected area can be quickly indicated according to the phase difference of harmonic signals received by the plurality of receiving units RX, the searching operation time is saved without back and forth searching, and the detection efficiency and the detection accuracy of the nonlinear nodes are improved.
In this embodiment, as shown in fig. 1-6, RX1 is a first receiving unit, RX2 is a second receiving unit, RX3 is a third receiving unit, RX4 is a fourth receiving unit, and TX is a transmitting unit.
In step S2, the method for calculating the direction angle of the nonlinear node is as follows:
as shown in fig. 1 and 2, the transmitting unit TX, the first receiving unit RX1 and the second receiving unit RX2 are all on the same antenna board, or are directly designed as PCB antennas; knowing that the first receiving unit RX1 and the second receiving unit RX2 have a spacing S, the wavelength of the harmonic signal is λ;
the phase measurement (fourier transform or other method) is performed on the baseband signals received by the first receiving unit RX1 and the second receiving unit RX2, respectively, to obtain the phases of the signals received by the first receiving unit RX1 and the second receiving unit RX2 as PH, respectively1 And pH2 Phase difference Δ PH = PH between them1 -PH2 ；
When the distance between the nonlinear node to be measured and the receiving unit is far larger than the distance S, the electromagnetic waves received by the first receiving unit RX1 and the second receiving unit RX2 are basically equivalent to parallel waves, and the distance difference between the harmonic signals and the two receiving units is calculated through the phase difference delta PH
The deflection angle of the incident harmonic signal can be obtained from d
The deflection angle θ is a one-dimensional direction angle of the nonlinear node.
The one-dimensional angle measurement method of the embodiment comprises the following steps:
the receiving unit RX comprises a first receiving unit RX1 and a second receiving unit RX2, and the transmitting unit TX is located at the midpoint of the connection line of the first receiving unit RX1 and the second receiving unit RX 2; the one-dimensional direction angle of the nonlinear node can be rapidly obtained by referring to the angle measurement calculation method.
The two-dimensional angle measurement method of the embodiment is as follows:
as shown in fig. 3, the receiving unit RX includes a first receiving unit RX1, a second receiving unit RX2 and a third receiving unit RX3, which are located at the vertices of a right triangle;
the connecting line of the first receiving unit RX1 and the second receiving unit RX2 is perpendicular to the connecting line of the second receiving unit RX2 and the third receivingunit RX 3. By adopting the calculation method, the vertical pitch angle of the nonlinear node is obtained according to the distance and the phase difference between the first receiving unit RX1 and the second receiving unit RX2
According to the distance and the phase difference between the second receiving unit RX2 and the third receiving unit RX3, the horizontal deflection angle θ of the nonlinear node is obtained.
Wherein the phases of the signals received by the first receiving unit RX1, the second receiving unit RX2 and the third receiving unit RX3 are respectively PH1 、PH2 、PH3 (ii) a The second receiving unit RX2 and the third receiving unit RX3 have a spacing S1 The distance between the second receiving unit RX2 and the first receiving unit RX1 is S2 (ii) a The wavelength of the harmonic signal is lambda;
phase difference Δ PH between the reception signals of the second reception unit RX2 and the third reception unit RX31 ＝PH2 -PH3 The difference in distance from the detected target node is
The phase difference Δ PH between the reception signals of the second reception unit RX2 and the first reception unit RX12 ＝PH2 -PH1 (ii) a The difference of distance from the detected target node is
Then the process of the first step is carried out,
horizontal deflection angle of incident harmonic signal
Vertical depression of incident harmonic signalsElevation angle
Thus, the horizontal deflection angle theta and the vertical pitch angle are integrated
And obtaining a two-dimensional direction angle of the target node, and positioning the azimuth angle of the target nonlinear node more accurately.
In the method, the first receiving unit RX1, the second receiving unit RX2 and the third receiving unit RX3 are preferably arranged at three vertices of an isosceles right triangle, such that S1 ＝S2 And the calculation is more convenient. Meanwhile, the transmitting unit TX is arranged at the middle point of the hypotenuse of the isosceles right triangle, so that the structure layout is more attractive, and the measuring precision is higher.
The second two-dimensional angle measurement method of the embodiment:
as shown in fig. 4, the receiving unit RX may further include a first receiving unit RX1, a second receiving unit RX2, a third receiving unit RX3, and a fourth receiving unit RX4 respectively located at four vertices of a rectangle, the first receiving unit RX1 and the third receiving unit RX3 located at diagonal vertices of the rectangle, and the second receiving unit RX2 and the fourth receiving unit RX4 located at diagonal vertices of the rectangle.
The phases of the signals received by the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3 and the fourth receiving unit RX4 are PH1 、PH2 、PH3 、PH4 。
The distance between the first receiving unit RX1 and the fourth receiving unit RX4 is equal to the distance between the second receiving unit RX2 and the third receiving unit RX3, and is S1 (ii) a The distance between the first receiving unit RX1 and the second receiving unit RX2 is equal to the distance between the third receiving unit RX3 and the fourth receiving unit RX4, and is S2 (ii) a The wavelength of the harmonic signal is lambda; and (3) taking an average value of the phase differences to further improve the detection precision:
ΔPH1 ＝[(PH1 -PH4 )+(PH2 -PH3 )]÷2
ΔPH2 ＝[(PH2 -PH1 )+(PH3 -PH4 )]÷2
the receiving units positioned at two horizontal sides of the rectangle have the distance difference with the detected target node
The receiving units positioned at two vertical edges of the rectangle have the distance difference with the detected target node
Then: horizontal deflection angle of incident harmonic signal
Vertical pitch angle of incident harmonic signal
Thus, according to the horizontal deflection angle theta and the vertical pitch angle
The azimuth angle of the target nonlinear node can be more accurately positioned.
In the method, preferably, the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3, and the fourth receiving unit RX4 are respectively located at four vertices of a square, and then S1 ＝S2, Thus, the calculation is faster; the transmitting unit TX is positioned at the center point of the square, so that the structural layout is more attractive, and the measurement precision is higher.
The two-dimensional angle measurement method of the embodiment three:
as shown in fig. 5, the receiving unit RX may further include a first receiving unit RX1, a second receiving unit RX2, a third receiving unit RX3, and a fourth receiving unit RX4, wherein a connection line between the first receiving unit RX1 and the third receiving unit RX3 is perpendicular to a connection line between the second receiving unit RX2 and the fourth receiving unit RX 4;
wherein the phases of the received signals of the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3 and the fourth receiving unit RX4 are PH respectively1 、PH2 、PH3 、PH4 (ii) a The distance between the first receiving unit RX1 and the third receiving unit RX3 is S1 The distance between the second receiving unit RX2 and the fourth receiving unit RX4 is S2 (ii) a The wavelength of the harmonic signal is lambda;
the phase difference Δ PH between the received signals of the first receiving unit RX1 and the third receiving unit RX31 ＝PH1 -PH3 And a difference in distance from the detected target node of
Phase difference Δ PH between the reception signals of the second reception unit RX2 and the fourth reception unit RX42 ＝PH2 -PH4 (ii) a The difference of distance from the detected target node is
Then the process of the first step is carried out,
horizontal deflection angle of incident harmonic signal
Vertical pitch angle of incident harmonic signal
Thus, according to the horizontal deflection angle theta and the vertical pitch angle
The azimuth angle of the target nonlinear node can be more accurately positioned.
Preferably, the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3, and the fourth receiving unit RX4 are respectively located at four vertices of a square, and the transmitting unit TX is located at a center point of the square. Then, S1 ＝S2, Thus calculating moreAnd the method is quick, and can more accurately and quickly locate the specific position of the target nonlinear node. The method has the maximum implementation probability and better technical effect.
The three-dimensional angle measurement method of the embodiment comprises the following steps:
as shown in fig. 6 and 7, on the basis of the first two-dimensional angle measurement method, a plane in which the first receiving unit RX1, the second receiving unit RX2, and the third receiving unit RX3 are located is taken as a reference plane, and the fourth receiving unit RX4 is located above or below the reference plane.
The phases of the signals received by the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3 and the fourth receiving unit RX4 are PH1 、PH2 、PH3 、PH4 . The fourth receiving unit RX is at a distance h from the reference plane. The second receiving unit RX1 and the third receiving unit RX2 have a spacing S1 The first receiving unit RX2 and the second receiving unit RX3 have a spacing S2 (ii) a The wavelength of the harmonic signal is lambda;
the signal phase difference of the receiving unit is:
ΔPH1 ＝PH2 -PH3
ΔPH2 ＝PH2 -PH1
ΔPH3 ＝PH3 -PH4
as shown in fig. 6, the distance differences of the receiving unit from the target nonlinear node are:
according to d1 Calculating the horizontal deflection angle of the incident harmonic signal as
According to d2 Calculating the vertical pitch angle of the incident harmonic signal as
According to d3 Calculating the pitch angle of the incident harmonic signal relative to the normal of the plane of the third receiving unit RX 3-the fourth receiving unit RX4
According to s2 And h may calculate the pitch angle of the normal to the RX3-RX4 plane with respect to the horizontal plane as
As shown in FIG. 7, the distance d from the target node to the reference plane4 Height d5 And h,
The relationship of (a) to (b) is as follows:
according to h,
And
the distance d from the target node to the reference plane can be obtained4 ：
Finally, synthesizing horizontal deflection angle theta and vertical pitch angle
And a distance d4 Then is coming toThe specific spatial position of the nonlinear node can be accurately positioned.
In the method, preferably, the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3, and the fourth receiving unit RX4 are respectively located at four vertices of a square, and then S1 ＝S2, Thus, the calculation is faster; the transmitting unit TX is positioned at the center point of the square, so that the structural layout is more attractive, and the measurement precision is higher.
Example two:
a second embodiment of the present invention provides a nonlinear node detector, to which the nonlinear node detection method provided in the first embodiment is applied, as shown in fig. 8, including:
a transmittingunit 1 for transmitting a probe signal;
the receiving units 2 are provided with at least two receiving units and are used for receiving second harmonic signals fed back by the nonlinear nodes;
thedata processing unit 3 is used for calculating and processing the azimuth data of the nonlinear node;
after the transmittingunit 1 transmits the detection signal, if a nonlinear node exists in the range, the receiving unit 2 obtains phase data of a second harmonic signal fed back by the nonlinear node, and thedata processing unit 3 calculates azimuth data of the nonlinear node according to the phase data and the distance of the receiving unit 2.
Thedata processing unit 3 includes a transmission baseband data processing unit 31 and a reception baseband data processing unit 32.
The transmittingunit 1 includes: a transmittingantenna 11, a first low pass filter 12, a first amplifier 13, a quadrature modulator 14, a first band pass filter 15, a digital-to-analog converter 16, and a first local oscillation unit 17.
The first local oscillator unit 17 is configured to generate a carrier of a radio frequency fundamental wave signal, where the frequency of the carrier is F0 The transmission baseband data processing unit 31 generates a frequency F1 Is processed by a digital-to-analog converter 16 and a first band-pass filter 15 and then by a quadrature modulator 14 to generate a signal having a frequency F0 +F1 The fundamental wave signal is amplified by an amplifier 13, and then is filtered by a low-pass filter 12 to remove higher harmonics, and finallyIs transmitted via the transmittingantenna 11.
In this embodiment, the number of the receiving units 2 is preferably four, and each receiving unit 2 includes: a receivingantenna 21, a second band-pass filter 22, a second amplifier 23, a quadrature demodulator 24, a second low-pass filter 25, an analog-to-digital converter 26, and a second local oscillation unit 27.
When the fundamental wave coverage area has nonlinear nodes, the nonlinear nodes can generate second harmonics (and other harmonic signals), the harmonic signals generated by the nonlinear nodes are received by the receivingantenna 21, the fundamental wave signals are filtered by the second band-pass filter 22, then the harmonic signals enter the second amplifier 23 for amplification, and then the harmonic signals enter the orthogonal demodulator 24 for demodulation (the local oscillator signal is 2*F)0 ) The base band for obtaining the harmonic wave is 2*F1 Then, the digital signal is processed by the second band-pass filter 25, enters the analog-to-digital converter 7 for digital processing, and is finally processed by the receiving baseband data processing unit 32.
The present embodiment further comprises a control and display unit 4, which is connected to the transmit data processing unit 31 and the receive baseband data processing unit 32, for controlling and displaying the operating conditions of the transmitunit 1 and the receive unit 2.
The embodiment adopts the structure of the single transmitting unit and the multiple receiving units, can quickly indicate the direction and the position of the nonlinear node in the detected area according to the phase difference of harmonic signals received by the multiple receiving units when searching and detecting the hidden electronic equipment with the nonlinear node, does not need to search back and forth, saves the time of searching operation, quickly finds the hidden target nonlinear node, and improves the detection efficiency and the accuracy of the nonlinear node
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (19)
1. A method of nonlinear node probing, wherein a probe comprises a transmitting unit and at least two receiving units, comprising the steps of:
s1, the receiving unit is arranged at different positions, the transmitting unit transmits detection signals, and if nonlinear nodes exist in a detection range, the receiving unit receives harmonic signals fed back by the nonlinear nodes and acquires phase data of different harmonic signals; if the nonlinear node does not exist, the receiving unit cannot receive the harmonic signal; the wavelength of the known harmonic signal is lambda;
and S2, obtaining the direction angle of the nonlinear node according to the phase data, the wavelength lambda of the harmonic signal and the distance between the receiving units.
2. The nonlinear node detection method according to claim 1, wherein in step S2, the method of calculating the direction angle of the nonlinear node is: the phases of the received signals of the two receiving units are respectively PH1 And pH2 Phase difference Δ PH = PH between them1 -PH2 (ii) a The distance between the two receiving units is S; if the distance difference between the harmonic signal and two receiving units is d, then d =
The direction angle of the non-linear junction
3. The nonlinear node detection method according to claim 1, wherein in step S1, the receiving unit includes a first receiving unit, a second receiving unit and a third receiving unit, which are located at vertices of a right triangle, and the second receiving unit is located at the vertex of the right angle;
the transmitting unit is located at the midpoint of the hypotenuse of the right triangle.
4. The nonlinear node detection method according to claim 3, wherein in step S2, a vertical pitch angle of the nonlinear node is obtained according to a distance and a phase difference between the first receiving unit and the second receiving unit; and obtaining the horizontal deflection angle of the nonlinear node according to the distance and the phase difference between the second receiving unit and the third receiving unit.
5. The nonlinear node detection method of claim 4, wherein the phases of the signals received by the first receiving unit, the second receiving unit and the third receiving unit are PH1 、PH2 、PH3 (ii) a The distance between the second receiving unit and the third receiving unit is S1 The distance between the second receiving unit and the first receiving unit is S2 ；
Phase difference Δ PH between the received signals of the second receiving unit and the third receiving unit1 ＝PH2 -PH3 The difference in distance from the detected target node is
Phase difference Δ PH of reception signals of the second reception unit and the first reception unit2 ＝PH2 -PH1 (ii) a The difference of distance from the detected target node is
Then, the calculation yields:
horizontal deflection angle of incident harmonic signal
Vertical pitch angle of incident harmonic signal
6. The compound of claim 5, whereinLinear node detection method, characterized in that said spacing S1 Equal to the spacing S2 。
7. The nonlinear node detector of any of claims 1-6, wherein the at least two receiving units each comprise a receiving antenna, the transmitting unit comprises a transmitting antenna, and the receiving antennas and the transmitting antennas of the at least two receiving units are both fabricated on the same antenna board, or the receiving antennas and the transmitting antennas of the at least two receiving units are designed as PCB antennas.
8. The nonlinear node detection method according to claim 4, wherein the receiving unit further includes a fourth receiving unit, a plane on which the first receiving unit, the second receiving unit, and the third receiving unit are located is a reference plane, and the fourth receiving unit is located above or below the reference plane; and obtaining the distance from the nonlinear node to the reference plane according to the vertical pitch angle, the phase difference and the vertical distance between the fourth receiving unit and the third unit and the distance from the fourth receiving unit to the reference plane.
9. A nonlinear node detector, comprising:
a transmitting unit for transmitting a probe signal;
the receiving units are provided with at least two receiving units and used for receiving second harmonic signals fed back by the nonlinear nodes, and the at least two receiving units are arranged at different positions;
the data processing unit is used for calculating and processing the azimuth data of the nonlinear node;
after the transmitting unit transmits the detection signal, if a nonlinear node exists in the range, the at least two receiving units acquire phase data of a second harmonic signal fed back by the nonlinear node, wherein the wavelength of the harmonic signal is lambda;
and the data processing unit calculates the direction angle of the nonlinear node according to the phase data, the wavelength lambda of the harmonic signal and the distance between the receiving units.
10. The nonlinear node detector of claim 9, wherein the data processing unit calculates the direction angle of the nonlinear node by: the phases of the received signals of the two receiving units are respectively PH1 And pH2 Phase difference Δ PH = PH between them1 -PH2 (ii) a The distance between the two receiving units is S; the distance difference between the harmonic signal and two receiving units is d, then
The direction angle of the non-linear junction
11. The nonlinear node detector of claim 9, wherein the receiving unit comprises a first receiving unit, a second receiving unit, and a third receiving unit, which are located at vertices of a right triangle, the second receiving unit being located at the vertices of a right angle; the transmitting unit is located at the midpoint of the hypotenuse of the right triangle.
12. The nonlinear node detector of claim 11, wherein the data processing unit obtains a vertical pitch angle of the nonlinear node according to a distance and a phase difference between the first receiving unit and the second receiving unit; and the data processing unit obtains the horizontal deflection angle of the nonlinear node according to the distance and the phase difference between the second receiving unit and the third receiving unit.
13. The nonlinear node detector of claim 12, wherein the first receiving unit, the second receiving unit, and the third receiving unit receive the signalThe phases of the numbers are respectively PH1 、PH2 、PH3 (ii) a The distance between the second receiving unit and the third receiving unit is S1 The distance between the second receiving unit and the first receiving unit is S2 ；
Phase difference Δ PH between the received signals of the second receiving unit and the third receiving unit1 ＝PH2 -PH3 The difference in distance from the detected target node is
Phase difference Δ PH of received signals of second receiving unit and first receiving unit2 ＝PH2 -PH1 (ii) a The difference of distance from the detected target node is
Then, the data processing unit calculates:
horizontal deflection angle of incident harmonic signal
Vertical pitch angle of incident harmonic signal
14. The nonlinear node detector of claim 13, wherein the spacing S1 Equal to the spacing S2 。
15. The nonlinear node detector of claim 12, wherein the receiving unit further comprises a fourth receiving unit, a plane on which the first receiving unit, the second receiving unit, and the third receiving unit are located is a reference plane, and the fourth receiving unit is located above or below the reference plane; and obtaining the distance from the nonlinear node to the reference plane according to the vertical pitch angle, the phase difference and the vertical distance between the fourth receiving unit and the third unit and the distance from the fourth receiving unit to the reference plane.
16. The nonlinear node detector of any of claims 9-15, wherein the at least two receiving units each comprise a receiving antenna, the transmitting unit comprises a transmitting antenna, and the receiving antennas and the transmitting antennas of the at least two receiving units are both fabricated on the same antenna board, or the receiving antennas and the transmitting antennas of the at least two receiving units are designed as PCB antennas.
17. The nonlinear node detector of claim 9, wherein the data processing unit comprises a transmit baseband data processing unit and a receive baseband data processing unit;
the transmitting unit comprises a transmitting antenna, a first low-pass filter, a first amplifier, an orthogonal modulator, a first band-pass filter, a digital-to-analog converter and a first local oscillator unit;
the first local oscillator unit is used for generating a carrier wave of a radio frequency fundamental wave signal, and the frequency of the carrier wave signal is F0 Said transmitting baseband data processing unit generating a frequency of F1 After being processed by a digital-to-analog converter and a first band-pass filter, the sine wave is processed by a quadrature modulator to generate a frequency F0 +F1 The fundamental wave signal is amplified by an amplifier, and then is filtered by a low-pass filter to remove higher harmonics, and finally is transmitted by a transmitting antenna.
18. The nonlinear node detector of claim 17, wherein each receiving unit comprises: the receiving antenna, the second band-pass filter, the second amplifier, the quadrature demodulator, the second low-pass filter, the analog-to-digital converter and the second local oscillator unit;
when the fundamental wave signal coverage area has nonlinear nodes, the nonlinear nodes can generate second harmonics, and harmonic signals generated by the nonlinear nodes are receivedReceiving by an antenna, filtering fundamental wave signals by a second band-pass filter, then amplifying by a second amplifier, and demodulating by an orthogonal demodulator to obtain a harmonic baseband of 2*F1 And the digital signals are processed by a second band-pass filter, enter an analog-to-digital converter for digital processing, and are finally processed by a receiving baseband data processing unit.
19. The nonlinear node detector of claim 17, further comprising a control and display unit coupled to the transmit data processing unit and the receive baseband data processing unit for controlling and displaying operating conditions of the transmit unit and the receive unit.
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| CN116520444A (en)* | 2023-05-09 | 2023-08-01 | 深圳市小安智慧科技有限公司 | A nonlinear node detection module, a security inspection device and a security inspection door |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030151541A1 (en)* | 2000-02-08 | 2003-08-14 | Oswald Gordon Kenneth Andrew | Methods and apparatus for obtaining positional information |
| EP1744177A1 (en)* | 2005-07-12 | 2007-01-17 | Rafael-Armament Development Authority Ltd. | Radar system and method for locating and identifying objects by their non-linear echo signals |
| CN102540262A (en)* | 2010-12-27 | 2012-07-04 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector |
| CN103728668A (en)* | 2014-01-07 | 2014-04-16 | 山东大学 | Single-hole directional geological radar for tunnel advanced geological exploration |
| US20140316261A1 (en)* | 2013-04-18 | 2014-10-23 | California Institute Of Technology | Life Detecting Radars |
| CN107004961A (en)* | 2017-01-22 | 2017-08-01 | 深圳市大疆创新科技有限公司 | Two-dimensional antenna system, method and device for locating a target |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2381077B (en)* | 1999-06-04 | 2003-10-01 | Res Electronics Internat | Pulse transmitting non-linear junction detector |
| US6163259A (en)* | 1999-06-04 | 2000-12-19 | Research Electronics International | Pulse transmitting non-linear junction detector |
| JP4875541B2 (en)* | 2006-08-28 | 2012-02-15 | 株式会社日本自動車部品総合研究所 | Direction detection method, object detection device, program |
| DE102010027972A1 (en)* | 2010-04-20 | 2011-10-20 | Robert Bosch Gmbh | Arrangement for determining the distance and the direction to an object |
| US9121943B2 (en)* | 2011-05-23 | 2015-09-01 | Sony Corporation | Beam forming device and method |
| CN103176181A (en)* | 2011-12-20 | 2013-06-26 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector of frequency modulation continuous wave system |
| CN203250023U (en)* | 2013-03-15 | 2013-10-23 | 程晓辉 | Non-linear junction detector based on S-wave band |
| CN104849764A (en)* | 2015-05-26 | 2015-08-19 | 上海海潮新技术研究所 | Array non-linear object detection system and method |
| CN204731427U (en)* | 2015-05-26 | 2015-10-28 | 上海海潮新技术研究所 | Array Nonlinear Parameter sniffer |
| CN106443669B (en)* | 2016-07-26 | 2019-02-26 | 中石化石油工程技术服务有限公司 | A four-antenna receiver array radar logging system imaging method |
| CN106443572A (en)* | 2016-09-09 | 2017-02-22 | 西北工业大学 | Spatial target two-dimensional angle quick estimation method based on crossed array |
| KR102647693B1 (en)* | 2016-11-28 | 2024-03-15 | 주식회사 에이치엘클레무브 | Radar Apparatus and Error Correction Method thereof |
| CN107085198B (en)* | 2017-06-23 | 2019-10-18 | 中国电子科技集团公司第三十六研究所 | A method and device for constructing a four-element three-dimensional array |
| JP6570610B2 (en)* | 2017-12-22 | 2019-09-04 | 三菱電機株式会社 | Radar equipment |
| KR102167097B1 (en)* | 2018-04-09 | 2020-10-16 | 주식회사 만도 | Radar Apparatus and Antenna Apparatus therefor |
| CN209215416U (en)* | 2018-06-27 | 2019-08-06 | 南京信息工程大学 | A Two-Dimensional Ultrasonic Wind Meter |
| CN108919270A (en)* | 2018-08-08 | 2018-11-30 | 中国航空工业集团公司雷华电子技术研究所 | A kind of single-emission and double-receiving CW with frequency modulation phased array radar system |
| CN109143218B (en)* | 2018-08-15 | 2023-10-27 | 武汉大学 | Lightning positioning system and lightning positioning method based on VHF radar |
| CN109239555B (en)* | 2018-10-15 | 2023-12-05 | 云南电网有限责任公司红河供电局 | Automatic directional transformer station partial discharge monitoring and positioning device and method |
| CN109633643B (en)* | 2018-12-11 | 2020-11-03 | 上海无线电设备研究所 | Terahertz ISAR three-dimensional imaging method based on back projection |
| CN109814064B (en)* | 2019-02-28 | 2023-04-14 | 中国电子科技集团公司第三十六研究所 | A direction-finding method and device based on a three-element L-shaped rectangular array interferometer |
- 2020
- 2020-07-17CNCN202211168623.0Apatent/CN115561745A/enactivePending
- 2020-07-17CNCN202211168620.7Apatent/CN115561744B/enactiveActive
- 2020-07-17CNCN202010694283.XApatent/CN111856439B/enactiveActive
- 2020-07-17CNCN202211168618.XApatent/CN115561743A/enactivePending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030151541A1 (en)* | 2000-02-08 | 2003-08-14 | Oswald Gordon Kenneth Andrew | Methods and apparatus for obtaining positional information |
| EP1744177A1 (en)* | 2005-07-12 | 2007-01-17 | Rafael-Armament Development Authority Ltd. | Radar system and method for locating and identifying objects by their non-linear echo signals |
| CN102540262A (en)* | 2010-12-27 | 2012-07-04 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector |
| US20140316261A1 (en)* | 2013-04-18 | 2014-10-23 | California Institute Of Technology | Life Detecting Radars |
| CN103728668A (en)* | 2014-01-07 | 2014-04-16 | 山东大学 | Single-hole directional geological radar for tunnel advanced geological exploration |
| CN107004961A (en)* | 2017-01-22 | 2017-08-01 | 深圳市大疆创新科技有限公司 | Two-dimensional antenna system, method and device for locating a target |
Non-Patent Citations (1)
| Title |
|---|
| 王智: "基于FPGA的谐波雷达设计与实现", 中国优秀硕士学位论文全文数据库信息科技辑, 5 January 2020 (2020-01-05), pages 3* |
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|---|---|
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| CN115561744B (en) | 2023-11-17 |
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