CN111856439A - Nonlinear node detection method and detector - Google Patents

Nonlinear node detection method and detector Download PDF

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CN111856439A
CN111856439A CN202010694283.XA CN202010694283A CN111856439A CN 111856439 A CN111856439 A CN 111856439A CN 202010694283 A CN202010694283 A CN 202010694283A CN 111856439 A CN111856439 A CN 111856439A
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receiving unit
nonlinear
receiving
nonlinear node
unit
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CN111856439B (en
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别体军
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Shenzhen Anweipu Technology Co ltd
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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
    • 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
    • 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
    • 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

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Abstract

The invention discloses a nonlinear node detection method and a detector, wherein the detector comprises a transmitting unit and at least two receiving units, and the method comprises the following steps: s1, the receiving unit is arranged at different positions, the transmitting unit transmits detection signals, and if nonlinear nodes exist in the 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. 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

Nonlinear node detection method and detector
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, the receiving unit is arranged at different positions, the transmitting unit transmits detection signals, and if nonlinear nodes exist in the 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 PH1And pH2The phase difference Δ PH ═ PH of the two1-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
Figure BDA0002590417510000021
The direction angle of the non-linear junction
Figure BDA0002590417510000022
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 the distance and the 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, the receiving unit RX is arranged at different positions, the transmitting unit TX transmits detection signals, if nonlinear nodes exist in the detection range, the receiving unit RX receives harmonic signals fed back by the nonlinear nodes 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 the first receiving unit, RX2 is the second receiving unit, RX3 is the third receiving unit, RX4 is the fourth receiving unit, and TX is the 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 designed directly as PCB antennas; knowing the spacing between the first receiving unit RX1 and the second receiving unit RX2 as 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 received signals of the first receiving unit RX1 and the second receiving unit RX2 as PH, respectively 1And pH2The phase difference Δ PH ═ PH of the two1-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
Figure BDA0002590417510000051
The deflection angle of the incident harmonic signal can be obtained from d
Figure BDA0002590417510000052
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 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 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
Figure BDA0002590417510000066
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 PH1、PH2、PH3(ii) a The second receiving unit RX2 and the third receiving unit RX3 have a spacing S1The 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;
the phase difference Δ PH between the reception signals of the second reception unit RX2 and the third reception unit RX31＝PH2-PH3The difference in distance from the detected target node is
Figure BDA0002590417510000061
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
Figure BDA0002590417510000062
Then the process of the first step is carried out,
horizontal deflection angle of incident harmonic signal
Figure BDA0002590417510000063
Vertical pitch angle of incident harmonic signal
Figure BDA0002590417510000064
Thus, the horizontal deflection angle theta and the vertical pitch angle are integrated
Figure BDA0002590417510000065
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, preferably, the first receiving unit RX1, the second receiving unit RX2 and the third receiving unit RX3 are disposed at three vertexes of an isosceles right triangle, so that S1＝S2And 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 are located at diagonal vertices of the rectangle, and the second receiving unit RX2 and the fourth receiving unit RX4 are located at diagonal vertices of the rectangle.
The phases of the signals received by the first RX1, the second RX2, the third RX3 and the fourth RX4 are PH1、PH2、PH3、PH4。
The distance between the first RX1 and the fourth RX4 is equal to the distance between the second RX2 and the third RX3, which is S1(ii) a The distance between the first RX1 and the second RX2 is equal to the distance between the third RX3 and the fourth RX4, which 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
Figure BDA0002590417510000071
The receiving units positioned at two vertical edges of the rectangle have the distance difference with the detected target node
Figure BDA0002590417510000072
Then: horizontal deflection angle of incident harmonic signal
Figure BDA0002590417510000073
Vertical pitch angle of incident harmonic signal
Figure BDA0002590417510000074
Thus, according to the horizontal deflection angle theta and the vertical pitch angle
Figure BDA0002590417510000075
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 first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3 and the fourth receiving unit RXRX4 the phases of the received signals are respectively PH1、PH2、PH3、PH4(ii) a The first receiving unit RX1 is separated from the third receiving unit RX3 by a distance S1The 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;
the phase difference Δ PH between the received signals of the first receiving unit RX1 and the third receiving unit RX31＝PH1-PH3The difference in distance from the detected target node is
Figure BDA0002590417510000081
The 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
Figure BDA0002590417510000082
Then the process of the first step is carried out,
horizontal deflection angle of incident harmonic signal
Figure BDA0002590417510000083
Vertical pitch angle of incident harmonic signal
Figure BDA0002590417510000084
Thus, according to the horizontal deflection angle theta and the vertical pitch angle
Figure BDA0002590417510000085
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,Therefore, the calculation is faster, and the specific direction of the target nonlinear node can be accurately and quickly positioned. 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 RX1, the second RX2, the third RX3 and the fourth 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 S1The 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:
Figure BDA0002590417510000091
according to d1Calculating the horizontal deflection angle of the incident harmonic signal as
Figure BDA0002590417510000092
According to d2Calculating the vertical pitch angle of the incident harmonic signal as
Figure BDA0002590417510000093
According to d3Calculating 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
Figure BDA0002590417510000101
According to s2And h may calculate the pitch angle of the normal to the RX3-RX4 plane with respect to the horizontal plane as
Figure BDA0002590417510000102
As shown in FIG. 7, the distance d from the target node to the reference plane4Height d5And h,
Figure BDA0002590417510000103
The relationship of (a) to (b) is as follows:
Figure BDA0002590417510000104
Figure BDA0002590417510000105
according to h,
Figure BDA0002590417510000106
And
Figure BDA0002590417510000107
the distance d from the target node to the reference plane can be obtained4：
Figure BDA0002590417510000108
Finally, the horizontal deflection angle theta and the vertical pitch angle are synthesized
Figure BDA0002590417510000109
And a distance d4The 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, 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 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 oscillator unit 17 is configured to generate a carrier of a radio frequency fundamental wave signal, where the frequency of the carrier is F0The transmitting baseband data processing unit 31 generates a frequency F1Is 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+F1The fundamental wave signal is amplified by an amplifier 13, and then is filtered by a low-pass filter 12 to remove higher harmonics, and finally is transmitted by a transmitting antenna 11.
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, 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 oscillation signals are 2 × F)0) The base band of the harmonic is obtained as 2 x F1Then, 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.
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 (10)

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 the 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.
2. The method for detecting nonlinear nodes according to claim 1, wherein in step S2, the method for calculating the direction angle of the nonlinear node is: the phases of the received signals of the two receiving units are respectively PH1And pH2The phase difference Δ PH ═ PH of the two1-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 between the harmonic signal and two receiving units is d, then
Figure FDA0002590417500000011
The direction angle of the non-linear junction
Figure FDA0002590417500000012
3. The nonlinear node detection method according to claim 1 or 2, 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-angled triangle, and the second receiving unit is located at a vertex of a right-angled triangle.
4. The method according to claim 3, wherein in step S2, the vertical pitch angle of the nonlinear node is obtained according to the distance and the 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 probing method according to claim 4, wherein 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 a 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.
6. The nonlinear node detection method according to claim 5, wherein a phase difference between the first receiving unit and the fourth receiving unit and a phase difference between the second receiving unit and the third receiving unit are averaged, and then a horizontal deflection angle of the nonlinear node is obtained by combining a 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 distance to obtain the vertical pitch angle of the nonlinear node.
7. The nonlinear node probing method according to claim 1 or 2, wherein in step S1, the receiving unit comprises 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.
8. The nonlinear node detection method according to claim 7, wherein 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 angle of the nonlinear node according to the distance and the phase difference between the second receiving unit and the fourth receiving unit.
9. 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.
10. A nonlinear node detector, applying the nonlinear node detection method of any one of claims 1-19, comprising:
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 a 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 azimuth data of the nonlinear node according to the phase data and the distance of the receiving unit.
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