CN111856439B - Nonlinear node detection method and detector - Google Patents
Nonlinear node detection method and detector Download PDFInfo
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- CN111856439B CN111856439B CN202010694283.XA CN202010694283A CN111856439B CN 111856439 B CN111856439 B CN 111856439B CN 202010694283 A CN202010694283 A CN 202010694283A CN 111856439 B CN111856439 B CN 111856439B
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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
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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, 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. 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 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 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.
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, 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, searching back and forth is not needed, the time of searching operation is saved, and the detecting efficiency and the detecting accuracy of the nonlinear node detector are improved.
Drawings
FIG. 1 is a first schematic 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 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, 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 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 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 PH of the signals received by the first receiving unit RX1 and the second receiving unit RX2, 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 equal to parallel waves, and harmonic signals are calculated to the two receiving units through the phase difference delta PHDistance difference of
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 positioned at the middle point of the connecting 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 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
And obtaining a horizontal deflection angle theta of the nonlinear node according to the distance and the phase difference between the second receiving unit RX2 and the third receiving unit RX 3.
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;
second receiving unit RX2Phase difference Δ PH with the reception signal of 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 user can use the device to make a visual display,
horizontal deflection angle of incident harmonic signal
Vertical pitch angle of incident harmonic signal
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, so 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 the distance 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 the distance 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 positioned at two horizontal sides of the rectangle have the distance difference with the detected target node
The receiving units positioned at two vertical sides 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 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 of the first receiving unit RX1 and the third receiving unit RX3 is perpendicular and orthogonal to a connection line of 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;
the 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 And a difference in distance from the detected target node of
Phase difference Δ PH of reception signals of second reception unit RX2 and fourth reception unit RX4 2 ＝PH 2 -PH 4 (ii) a The difference of distance from the detected target node is
Then the user can use the device to make a visual display,
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, Therefore, the calculation is faster, and the specific direction of the target nonlinear node can be accurately and quickly positioned. The method has the advantages of 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 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 respectively PH 1 、PH 2 、PH 3 、PH 4 . The distance between the fourth receiving unit RX and the reference plane is h. The second receiving unit RX2 and the third receiving unit RX3 have a spacing S 1 The first receiving unit RX1 and the second receiving unit RX2 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
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 vertical distance d from the target node to the first predetermined plane 4 And the vertical height d from the target node to the second preset plane 5 H, and h,
The relationship of (c) is as follows:
the first preset plane is parallel to the reference plane and is a plane where the fourth receiving unit RX4 is located, the second preset plane is perpendicular to the reference plane and passes through a median line of a right triangle, wherein the first receiving unit RX1, the second receiving unit RX2 and the third receiving unit RX3 are located at the vertex of the right triangle, and the median line is parallel to a connecting line between the second receiving unit RX2 and the third receiving unit RX 3;
according to h,
And
the vertical distance d from the target node to the first preset plane can be obtained 4 ：
Thus, the vertical distance d from the target node to the reference plane can be obtained 6 ：
Finally, synthesizing horizontal deflection angle theta and vertical pitch angle
And a distance d 6 The specific spatial position of the nonlinear node can be accurately positioned.
In the method, preferably, the vertical projections of the first receiving unit RX1, the second receiving unit RX2, the third receiving unit RX3 and the fourth receiving unit RX4 on the reference plane are respectively located at four vertexes of a squareAbove, then, S 1 ＝S 2, Therefore, 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 unit 2 is provided with at least two units and is 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 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, 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 signals) 0 ) Obtaining the base band of harmonic wave as 2 x F 1 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
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 (6)
1. A nonlinear node detection method, characterized in that 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 the first receiving unit, the second receiving unit and the third receiving unit are located at the vertexes of a right triangle, the second receiving unit is located at the vertexes of a right angle, 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 the reference plane, the distance between the fourth receiving unit and the reference plane is h, the vertical projection of the fourth receiving unit on the reference plane, the first receiving unit, the second receiving unit and the third receiving unit are located at the four vertexes of a rectangle, the transmitting unit is located at the central point of the rectangle, the distance between the second receiving unit and the third receiving unit is S1, the distance between the first receiving unit and the second receiving unit is S2, the transmitting unit transmits a detection signal, and if nonlinear nodes exist in a detection range, the four receiving units receive harmonic signals fed back by the nonlinearity, and acquire phase positions of PH signals respectively of the harmonic signals received by the four receiving units 1 、PH 2 、PH 3 And pH 4 The wavelength of the harmonic signal is lambda; if the nonlinear node does not exist, the four receiving units cannot receive harmonic signals;
s2, according to the PH 1 、PH 2 、PH 3 And pH 4 And λ, S 1 、S 2 And h, calculating the horizontal deflection angle theta of the projection of the harmonic signal fed back by the nonlinear node on the reference plane relative to the perpendicular line of the connecting line between the second receiving unit and the third receiving unit in the reference plane, and calculating the vertical pitch angle of the harmonic signal fed back by the nonlinear node relative to the normal line of the reference plane
Calculating the pitch angle of the harmonic signal fed back by the nonlinear node relative to the plane normal of the third receiving unit and the fourth receiving unit
And calculating the pitch angle of the plane normal of the third receiving unit and the fourth receiving unit relative to the reference plane normal
According to
And h calculating the vertical distance d between the nonlinear node and the reference plane 6 The method specifically comprises the following steps:
synthesizing the horizontal deflection angle theta and the vertical pitch angle
And a distance d 6 The specific spatial location of the nonlinear node can be located.
2. The nonlinear node detection method according to claim 1, wherein in step S2:
calculating a horizontal deflection angle theta of the harmonic signal fed back by the nonlinear node, specifically: a phase difference Δ PH of the harmonic signals received by the second receiving unit and the third receiving unit 1 ＝PH 2 -PH 3 Distance difference of harmonic signals received by the second receiving unit and the third receiving unit
The horizontal deflection angle of the harmonic signal fed back by the nonlinear node
Calculating the vertical pitch angle of the harmonic signal fed back by the nonlinear node
The method comprises the following specific steps: phase difference Δ PH of harmonic signals received by the second receiving unit and the first receiving unit 2 ＝PH 2 -PH 1 Distance difference between harmonic signals received by the second receiving unit and the first receiving unit
Vertical pitch angle of harmonic signal fed back by nonlinear node
Calculating the pitch angle of the harmonic signal fed back by the nonlinear node relative to the plane normal of the third receiving unit and the fourth receiving unit
The method specifically comprises the following steps: a phase difference Δ PH of the harmonic signals received by the third receiving unit and the fourth receiving unit 3 ＝PH 3 -PH 4 Distance difference of harmonic signals received by the third receiving unit and the fourth receiving unit
The pitch angle of the harmonic signal fed back by the nonlinear node relative to the normal of the plane where the third receiving unit and the fourth receiving unit are located
Calculating the pitch angle of the plane normal of the third receiving unit and the fourth receiving unit relative to the reference plane normal
The method specifically comprises the following steps:
wherein, the vertical distance d from the nonlinear node to the first preset plane 4 Vertical height d from the nonlinear node to the second predetermined plane 5 H, and h,
The relationship of (a) to (b) is as follows:
the first preset plane is parallel to the reference plane and is a plane where the fourth receiving unit is located, the second preset plane is perpendicular to the reference plane and passes through a median line of a right triangle, the first receiving unit, the second receiving unit and the third receiving unit are located at the top point of the right triangle, and the median line is parallel to a connecting line between the second receiving unit and the third receiving unit;
thereby, the vertical distance d from the nonlinear node to the reference plane is obtained 6 :
3. The nonlinear node detection method according to claim 1 or 2, wherein in step S1, a vertical projection of the fourth receiving unit on the reference plane, the first receiving unit, the second receiving unit, and the third receiving unit are located at four vertices of a square, and the transmitting unit is located at a center point of the square.
4. A nonlinear node detector, comprising:
a transmitting unit for transmitting a probe signal;
the four receiving units are arranged at different positions, wherein the first receiving unit, the second receiving unit and the third receiving unit are positioned at the vertex of a right triangle, the second receiving unit is positioned at the vertex of a right angle, the plane where the first receiving unit, the second receiving unit and the third receiving unit are positioned is a reference plane, the fourth receiving unit is positioned above the reference plane, the distance between the fourth receiving unit and the reference plane is h, the vertical projection of the fourth receiving unit on the reference plane, the first receiving unit, the second receiving unit and the third receiving unit are positioned at the four vertices of a rectangle, the transmitting unit is positioned at the central point of the rectangle, the distance between the second receiving unit and the third receiving unit is S1, and the distance between the first receiving unit and the second receiving unit is S2;
the data processing unit is used for calculating and processing the azimuth data and the distance of the nonlinear node so as to position the specific spatial position 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 、S 2 And h, calculating the non-lineThe projection of the harmonic signal fed back by the nonlinear node on the reference plane is relative to the horizontal deflection angle theta of the perpendicular line of the connecting line between the second receiving unit and the third receiving unit in the reference plane, and the vertical pitch angle theta of the harmonic signal fed back by the nonlinear node relative to the normal line of the reference plane is calculated
Calculating the pitch angle of the harmonic signal fed back by the nonlinear node relative to the plane normal of the third receiving unit and the fourth receiving unit
And calculating the pitch angle of the plane normal of the third receiving unit and the fourth receiving unit relative to the reference plane normal
According to
And h calculating the vertical distance d between the nonlinear node and the reference plane 6 The method specifically comprises the following steps:
synthesizing the horizontal deflection angle theta and the vertical pitch angle
And a distance d 6 The specific spatial location of the nonlinear node can be located.
5. The nonlinear node detector of claim 4, wherein the data processing unit calculates a horizontal deflection angle θ of the harmonic signal fed back by the nonlinear node, specifically: the second receiving listPhase difference of harmonic signals received by element and third receiving unit 1 ＝PH 2 -PH 3 Distance difference of harmonic signals received by the second receiving unit and the third receiving unit
The horizontal deflection angle of the harmonic signal fed back by the nonlinear node
The data processing unit calculates the vertical pitch angle of the harmonic signal fed back by the nonlinear node
The method comprises the following specific steps: phase difference Δ PH of harmonic signals received by the second receiving unit and the first receiving unit 2 ＝PH 2 -PH 1 Distance difference between harmonic signals received by the second receiving unit and the first receiving unit
Vertical pitch angle of harmonic signal fed back by nonlinear node
The data processing unit calculates the pitch angle of the harmonic signal fed back by the nonlinear node relative to the plane normal of the third receiving unit and the fourth receiving unit
The method comprises the following specific steps: a phase difference Δ PH of the harmonic signals received by the third receiving unit and the fourth receiving unit 3 ＝PH 3 -PH 4 Distance difference of harmonic signals received by the third receiving unit and the fourth receiving unit
The pitch angle of the harmonic signal fed back by the nonlinear node relative to the normal of the plane where the third receiving unit and the fourth receiving unit are located
The data processing unit calculates the pitch angle of the plane normal of the third receiving unit and the fourth receiving unit relative to the reference plane normal
The method specifically comprises the following steps:
wherein, the vertical distance d between the nonlinear node and the first preset plane 4 Vertical height d from the nonlinear node to the second predetermined plane 5 H, and h,
The relationship of (c) is as follows:
the first preset plane is parallel to the reference plane and is a plane where the fourth receiving unit is located, the second preset plane is perpendicular to the reference plane and passes through a median line of a right triangle, the first receiving unit, the second receiving unit and the third receiving unit are located at the vertex of the right triangle, and the median line is parallel to a connecting line between the second receiving unit and the third receiving unit;
thus, the data processing unit calculates the vertical distance d from the nonlinear node to the reference plane 6 :
6. The nonlinear node detector of claim 4 or 5, wherein a vertical projection of the fourth receiving unit on the reference plane, the first receiving unit, the second receiving unit, and the third receiving unit are located at four vertices of a square, and the transmitting unit is located at a center point of the square.
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