CN115561745A - Nonlinear node detection method and detector - Google Patents
Nonlinear node detection method and detector Download PDFInfo
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- CN115561745A CN115561745A CN202211168623.0A CN202211168623A CN115561745A CN 115561745 A CN115561745 A CN 115561745A CN 202211168623 A CN202211168623 A CN 202211168623A CN 115561745 A CN115561745 A CN 115561745A
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- 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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/04—Systems determining presence of a target
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- 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
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
Abstract
The invention discloses a nonlinear node detection method and a detector, wherein the detector comprises a transmitting unit and four 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 no nonlinear node exists, 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. The nonlinear node detector comprises a transmitting unit, a receiving unit and a data processing unit. The invention can quickly indicate the direction and the position point of the nonlinear node in the detected area according to the phase difference of the harmonic signals received by a plurality of receiving units.
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 actually used, a detected region needs to be searched in a back-and-forth scanning mode to find a hidden nonlinear node, and for a region with a large area, scanning type searching needs to spend much time and has the risk of missing scanning.
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 the 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 PH 1 And pH 2 Phase difference Δ PH = PH between them 1 -PH 2 (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 triangle.
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, averaging 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, and then combining the distances to obtain a horizontal deflection angle of a nonlinear node; 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 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 further described in 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 will 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 nonlinear nodes hidden in the detected area can be quickly indicated according to the phase difference of the harmonic signals received by the plurality of receiving units RX, the searching operation is not needed to be repeated, the time of the searching operation is saved, 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 directly designed as PCB antennas; knowing that the distance between the first receiving unit RX1 and the second receiving unit RX2 is S, and the wavelength of the harmonic signal is lambda;
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, respectively 1 And pH 2 Phase difference Δ PH = PH between them 1 -PH 2 ；
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;
a line connecting the first receiving unit RX1 and the second receiving unit RX2 is perpendicular to a line connecting the second receiving unit RX2 and the third receiving unit 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 PH 1 、PH 2 、PH 3 (ii) a The second receiving unit RX2 and the third receiving unit RX3 have a spacing S 1 The distance between the second receiving unit RX2 and the first receiving unit RX1 is S 2 (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 RX3 1 ＝PH 2 -PH 3 The difference in distance from the detected target node is
Phase difference Δ PH between the received signals of the second receiving unit RX2 and the first receiving unit RX1 2 ＝PH 2 -PH 1 (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 S 1 ＝S 2 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 PH 1 、PH 2 、PH 3 、PH 4 。
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 S 1 (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 S 2 (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:
ΔPH 1 ＝[(PH 1 -PH 4 )+(PH 2 -PH 3 )]÷2
ΔPH 2 ＝[(PH 2 -PH 1 )+(PH 3 -PH 4 )]÷2
the receiving units on two horizontal sides of the rectangle have a 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 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 S 1 ＝S 2, 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 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 PH 1 、PH 2 、PH 3 、PH 4 (ii) a The distance between the first receiving unit RX1 and the third receiving unit RX3 is S 1 The distance between the second receiving unit RX2 and the fourth receiving unit RX4 is S 2 (ii) a The wavelength of the harmonic signal is lambda;
phase difference Δ PH between the received signals of the first receiving unit RX1 and the third receiving unit RX3 1 ＝PH 1 -PH 3 The difference in distance from the detected target node is
Phase difference Δ PH between the reception signals of the second reception unit RX2 and the fourth reception unit RX4 2 ＝PH 2 -PH 4 (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 located at four vertices of a square, respectively, and the transmitting unit TX is located at a center point of the square. Then, S 1 ＝S 2, Thus, calculate 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 PH 1 、PH 2 、PH 3 、PH 4 . 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 S 1 The first receiving unit RX2 and the second receiving unit RX3 have a spacing S 2 (ii) a The wavelength of the harmonic signal is lambda;
the signal phase difference of the receiving unit is:
ΔPH 1 ＝PH 2 -PH 3
ΔPH 2 ＝PH 2 -PH 1
ΔPH 3 ＝PH 3 -PH 4
as shown in fig. 6, the distance differences of the receiving unit from the target nonlinear node are:
according to d 1 Calculating the horizontal deflection angle of the incident harmonic signal as
According to d 2 Calculating the vertical pitch angle of the incident harmonic signal as
According to d 3 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 as
According to s 2 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 plane 4 Height d 5 And h,
The relationship of (c) is as follows:
according to h,
And
the distance d from the target node to the reference plane can be obtained 4 ：
Finally, synthesizing horizontal deflection angle theta and vertical pitch angle
And a distance d 4 Then is ready toTo precisely locate the specific spatial location of the nonlinear node.
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 S 1 ＝S 2, 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 transmitting unit 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;
the data processing unit 3 is used for calculating and processing the azimuth data of the nonlinear node;
after the transmitting unit 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 the data processing unit 3 calculates azimuth data of the nonlinear node according to the phase data and the distance of the receiving unit 2.
The data processing unit 3 includes a transmission baseband data processing unit 31 and a reception baseband data processing unit 32.
The transmitting unit 1 includes: a transmitting antenna 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 oscillation unit 17 is used for generating a carrier wave of a radio frequency fundamental wave signal, and the frequency of the carrier wave signal is F 0 The transmitting baseband data processing unit 31 generates a frequency F 1 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 F 0 +F 1 The fundamental wave signal is amplified by an amplifier 13, filtered by a low-pass filter 12 to remove higher harmonics, and finally filtered by a low-pass filter 12The transmitting antenna 11 transmits.
In this embodiment, the number of the receiving units 2 is preferably four, and each receiving unit 2 includes: a receiving antenna 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 receiving antenna 21, the fundamental wave signals are filtered by the second band-pass filter 22, amplified by the second amplifier 23, and demodulated by the orthogonal demodulator 24 (the local oscillation signals are 2 × f signals) 0 ) Obtaining the base band of harmonic wave as 2 x F 1 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 transmit unit 1 and the receive unit 2.
In the embodiment, a structure of a single transmitting unit and multiple receiving units is adopted, so that when the hidden electronic equipment with the nonlinear nodes is searched and detected, the direction and the position of the nonlinear nodes in a detected area can be quickly pointed out according to the phase difference of harmonic signals received by the multiple receiving units, the back-and-forth search is not needed, the time of searching operation is saved, the hidden target nonlinear node is quickly found, the detection efficiency and the accuracy of the nonlinear nodes are improved, and the hidden target nonlinear node is also quickly found
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (15)
1. A nonlinear node detection method, wherein a detector comprises a transmitting unit and four receiving units, the four receiving units comprise a first receiving unit, a second receiving unit, a third receiving unit, and a fourth receiving unit, and the nonlinear node detection method comprises the following steps:
s1, the four receiving units are arranged at different positions, wherein a connecting line of the first receiving unit and the third receiving unit is perpendicular and orthogonal to a connecting line of the second receiving unit and the fourth receiving unit, and the distance between the first receiving unit and the third receiving unit is S 1 The distance between the second receiving unit and the fourth receiving unit is S 2 The four transmitting units transmit detection signals, and if nonlinear nodes exist in a detection range, the four receiving units receive harmonic signals fed back by the nonlinear nodes and acquire phase data of different harmonic signals; if the nonlinear node does not exist, the four receiving units cannot receive harmonic signals; the wavelength of the known harmonic signal is λ;
s2, calculating the phase difference of the receiving signals of the first receiving unit and the third receiving unit, calculating the phase difference of the receiving signals of the second receiving unit and the fourth receiving unit, and calculating the phase difference according to the phase difference, the wavelength lambda of the harmonic signal and the distance S 1 、S 2 And obtaining the horizontal deflection angle and the vertical pitch angle of the nonlinear node.
2. The nonlinear node detection method according to claim 1, wherein in step S2, the distance S between the first receiving unit and the third receiving unit is determined according to 1 Obtaining a horizontal deflection angle of the nonlinear node by the wavelength lambda and the phase difference of the harmonic signal; according to the distance S between the second receiving unit and the fourth receiving unit 2 The wavelength lambda of the harmonic signal and the phase difference are calculated to obtain the vertical pitch angle of the nonlinear node.
3. The nonlinear node detection method of claim 2, wherein the first node is a node of a treeThe phases of the received signals of the receiving unit and the third receiving unit are respectively PH 1 And pH 2 Phase difference of Δ PH between them 1 ＝PH 1 -PH 2 The difference in distance from the detected target node is
The phases of the received signals of the second receiving unit and the fourth receiving unit are respectively PH 2 And pH 4 Phase difference of Δ PH between them 2 ＝PH 2 -PH 4 The difference in distance from the detected target node is
4. The nonlinear node detection method of claim 3, wherein a horizontal deflection angle of a harmonic signal fed back by the nonlinear node is set
Vertical pitch angle of harmonic signal fed back by nonlinear node
5. The nonlinear node detection method according to any one of claims 1 to 4, wherein the four receiving units respectively include receiving antennas, the transmitting unit includes transmitting antennas, and the receiving antennas and the transmitting antennas of the four receiving units are all fabricated on the same antenna board, or the receiving antennas and the transmitting antennas of the four receiving units are designed as PCB antennas.
6. The nonlinear node detection method according to claim 5, wherein the receiving antennas of the four receiving units are located on the same reference plane; and the transmission antenna is arranged on a crossing point of a connecting line of the first receiving unit and the third receiving unit and a connecting line of the second receiving unit and the fourth receiving unit, which is vertically orthogonal.
7. A nonlinear node detector, comprising:
a transmitting unit for transmitting a probe signal;
four receiving units for receiving second harmonic signals fed back by nonlinear nodes, wherein the four receiving units comprise a first receiving unit, a second receiving unit, a third receiving unit and a fourth receiving unit, the four receiving units are arranged at different positions, a connecting line of the first receiving unit and the third receiving unit is perpendicular and orthogonal to a connecting line of the second receiving unit and the fourth receiving unit, and the distance between the first receiving unit and the third receiving unit is S 1 The distance between the second receiving unit and the fourth receiving unit is S 2 ；
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 nonlinear nodes exist in the range, the phases of the second harmonic signals obtained by the four receiving units and fed back by the nonlinear nodes are respectively PH 1 、PH 2 、PH 3 And pH 4 The wavelength of the harmonic signal is lambda;
the data processing unit is according to the PH 1 、PH 2 、PH 3 And pH 4 And λ, S 1 And S 2 And calculating the horizontal deflection angle and the vertical pitch angle of the nonlinear node.
8. The nonlinear node detector of claim 7, wherein the data processing unit is based on a spacing S between the first receiving unit and the third receiving unit 1 Calculating the wavelength lambda and the phase difference of the harmonic signals to obtain the horizontal deflection angle of the nonlinear node; the data processing unit is used for receiving the fourth receiving unit and the second receiving unitSpacing S between elements 2 And calculating the vertical pitch angle of the nonlinear node according to the wavelength lambda and the phase difference of the harmonic signal.
9. The nonlinear node detector of claim 8, wherein the phases of the received signals of the first receiving unit and the third receiving unit are respectively PH 1 And pH 2 Phase difference of Δ PH between them 1 ＝PH 1 -PH 2 The difference in distance from the detected target node is
The phases of the received signals of the second receiving unit and the fourth receiving unit are respectively PH 2 And pH 4 Phase difference of Δ PH between them 2 ＝PH 2 -PH 4 The difference in distance from the detected target node is
10. The nonlinear node detector of claim 9, wherein a horizontal deflection angle of a harmonic signal fed back by the nonlinear node is a horizontal deflection angle of a harmonic signal fed back by the nonlinear node
Vertical pitch angle of harmonic signal fed back by nonlinear node
11. The nonlinear node detector of any one of claims 7-10, wherein the four receiving units respectively comprise receiving antennas, the transmitting unit comprises transmitting antennas, and the receiving antennas and the transmitting antennas of the four receiving units are all fabricated on the same antenna board, or the receiving antennas and the transmitting antennas of the four receiving units are designed as PCB antennas.
12. The nonlinear node detector of claim 11, wherein the receive antennas of the four receive units are located on a same reference plane; and the transmission antenna is arranged on a crossing point of a connecting line of the first receiving unit and the third receiving unit and a connecting line of the second receiving unit and the fourth receiving unit, which is vertically orthogonal.
13. The nonlinear node detector of claim 7, 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 F 0 Said transmit baseband data processing unit generates a frequency of F 1 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 F 0 +F 1 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.
14. The nonlinear node detector of claim 13, 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, harmonic signals generated by the nonlinear nodes are received by the receiving antenna, the fundamental wave signals are filtered by the second band-pass filter, then the harmonic signals enter the second amplifier for amplification, and then the harmonic signals enter the orthogonal demodulator for demodulation, so that the base band of the harmonic waves is 2 x F 1 Processed by a second band-pass filter and enters a modeThe digital converter is used for carrying out digital processing, and finally, the receiving baseband data processing unit is used for carrying out processing.
15. The nonlinear node detector of claim 13, 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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