CN107678005A - A kind of in-orbit celestial body underground detection radar clutter suppression method - Google Patents
A kind of in-orbit celestial body underground detection radar clutter suppression method Download PDFInfo
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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
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Abstract
The invention discloses a kind of in-orbit celestial body underground detection radar clutter suppression method, the present invention is based on in-orbit celestial body underground detection radar double antenna detecting structure, there is very strong correlation feature using dipole and the non-substar area echo that monopole antenna receives, using adaptive-filtering mode, the suppression to non-substar radar clutter is realized.This method can when input signal statistical property is unknown, can adaptive regulation filter parameter, realize optimal filter.Experiment is proved in the case of noise is smaller, it is not necessary to big amount of calculation, be can be achieved with good filter effect, is completed radar clutter and suppress.
Description
Technical Field
The invention relates to a radar clutter suppression method, in particular to an on-orbit star underground detection radar clutter suppression method.
Background
With the continuous deepening of deep space exploration tasks in China, the exploration requirement on the surface layer structure of the star body is increasingly improved. The star subsurface detection radar works in an HF wave band, has strong penetrating power, can penetrate into a dry subsurface and reveals subsurface structure characteristics, so that the technology is gradually applied to detection of stars and other stars. However, the HF band radar generally employs monopole and dipole antennas, the antenna beam is wide, and receives the sub-satellite point, non-sub-satellite point surface echo and sub-surface echo at the same time, and the electromagnetic wave is attenuated when propagating in the underground dispersive medium, so that the sub-surface echo received by the radar is weak and is easily submerged in the surface echo, which causes difficulty in sub-surface imaging, and therefore the problem of radar clutter suppression must be considered.
The method for suppressing clutter of the double-antenna proportional subtraction radar is simple in principle and can obtain a good suppression effect under the condition that the terrain is known. However, the method needs to calculate the antenna gain corresponding to each angle of the ground scene, and the calculation amount is large; and the method has higher requirement on the signal to noise ratio.
Disclosure of Invention
The invention aims to provide an on-orbit star underground detection radar clutter suppression method, and solves the problems of large calculated amount and high requirement on signal-to-noise ratio in a double-antenna proportional subtraction radar clutter suppression technology in the conventional method.
The method for inhibiting clutter of the on-orbit star underground detection radar comprises the following specific steps:
first step of building radar clutter suppression system
A radar clutter suppression system comprising: the device comprises a dipole antenna receiving channel module, a monopole antenna receiving channel module, an input signal module, a reference signal input module, an adaptive filter module, an error determination module and a dual-antenna radar clutter suppression output module.
The function of the dipole antenna receiving channel module is as follows: and completing the reception of the echoes of the surfaces of the subsatellite point stars and the non-subsatellite point stars.
The monopole antenna receiving channel module has the functions of: and completing the reception of the surface and subsurface echoes of the subsatellite point stars.
The input signal module has the functions of: and completing the reading of the main channel signal of the adaptive filter.
The reference signal input module has the functions of: and completing the reading of the self-adaptive filtering reference channel signal.
The function of the adaptive filter module is: according to the change of the statistical characteristics of the input signals, the filter parameters of the filter are adjusted in a self-adaptive mode, and the requirement of the least square criterion is met.
The function of the error determination module is: and determining an error signal and an error vector inner product, and controlling the iteration times of the self-adaptive filter module and the output of a final error signal.
The double-antenna radar clutter suppression output module has the functions of: and reading the error signal finally output by the error determination module.
The output of the dipole antenna receiving channel module is used as the input of the reference signal input module; the output of the reference signal input module is used as the sum channel input of the error determination module; the output of the monopole receiving channel module is used as the input of the input signal module; the output of the input signal module is used as the input of the self-adaptive filter module; the output of the adaptive filter module is used as the difference channel input of the error determination module. And the error vector inner product output of the error determination module is used as the iteration control input of the self-adaptive filter module, and the error signal output of the error determination module is the input of the double-antenna radar clutter suppression output module.
The second step of the dipole antenna receiving channel module completes the reception of the echo of the surface and the subsurface of the satellite body of the subsatellite point, the non-subsatellite point
By utilizing the characteristic that the dipole antenna wave beam covers the detection areas of the points under the satellite and the points under the non-satellite, the dipole antenna receiving channel module receives the echoes of the points under the satellite, the surfaces of the star bodies of the points under the non-satellite and the sub-surfaces.
Thirdly, the monopole receiving channel module completes the reception of the surface and subsurface echoes of the star body of the sub-star point
By utilizing the characteristic that the gain of the monopole antenna beam at the sub-satellite point is very small, the monopole antenna receiving channel module realizes the receiving of the echo of the sub-surface and the surface of the non-sub-satellite point.
Fourthly, the input signal module finishes the reading-in of the main channel signal of the adaptive filter
The input signal module reads the output signal of the monopole antenna receiving channel module, and outputs the output signal as the input signal of the adaptive filter module after preprocessing.
Fifthly, the reference signal input module finishes the reading-in of the self-adaptive filtering reference channel signal
And the reference signal input module reads the output signal of the dipole antenna receiving channel module, and outputs the output signal as a reference signal of the adaptive filter module after preprocessing.
Sixth step adaptive filter module adjusts filter parameters
The self-adaptive filter module adjusts the weight of the filter according to the statistical characteristic change of the input signal of the error determination module and the selected self-adaptive filter model, and outputs the latest filtering signal.
The seventh step error determination module calculates the inner product of the error vectors
The error determining module calculates the error between the reference signal and the filtering output signal of the adaptive filter module to obtain an error vector, further calculates the inner product of the error signal, and controls the adaptive filter module to stop iteration when the inner product meets the least square criterion.
Input signal：。
Adaptive filter weights：。
The adaptive filter module outputs a signal:。
reference signal：。
Error signal：。
Wherein,1 st, 2 nd and 2 nd of the input signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of reference signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of error signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of error signal respectivelyAnd filter weights.
Inner product of error signal：
Is composed ofThe function of the transposition of (a) to (b),is the first of the error signalThe number of the sampled values is determined,is a serial number.
Eighth step, the dual-antenna radar clutter suppression output module reads the output error signal of the error determination module
When the adaptive filter module stops iteration, the double-antenna radar clutter suppression output module reads an error signal output by the error determination module and uses the error signal as a star subsurface detection signal after radar clutter suppression.
Therefore, clutter suppression of the on-orbit star underground detection radar is completed.
The method is based on a double-antenna detection structure of the star subsurface detection radar, utilizes the characteristic that a dipole and a non-sub-satellite-point region echo received by a monopole antenna have strong correlation, and adopts a self-adaptive filtering algorithm to realize the suppression of the non-sub-satellite-point radar clutter. The method can self-adaptively adjust the parameters of the filter when the statistical characteristics of the input signals are unknown, and realize optimal filtering. Experiments prove that under the condition of small signal-to-noise ratio, a good filtering effect can be realized without large calculation amount, and radar clutter suppression is completed.
Drawings
FIG. 1 is a structural diagram of clutter suppression of an on-orbit star underground radar.
1. The system comprises a monopole antenna receiving channel module 2, a dipole antenna receiving channel module 3, an input signal module 4, a reference signal input module 5, an adaptive filter module 6, an error determination module 7, a dual-antenna radar clutter suppression output module.
Detailed Description
The method for inhibiting clutter of the on-orbit star underground detection radar comprises the following specific steps:
first step of building radar clutter suppression system
A radar clutter suppression system comprising: the device comprises a dipole antenna receiving channel module 2, a monopole antenna receiving channel module 1, an input signal module 3, a reference signal input module 4, an adaptive filter module 5, an error determination module 6 and a dual-antenna radar clutter suppression output module 7.
The function of the dipole antenna receiving channel module 2 is as follows: and completing the reception of the echoes of the surfaces of the subsatellite point stars and the non-subsatellite point stars.
The monopole antenna receiving channel module 1 has the following functions: and completing the reception of the surface and subsurface echoes of the subsatellite point stars.
The function of the input signal module 3 is: and completing the reading of the main channel signal of the adaptive filter.
The reference signal input module 4 functions as: and completing the reading of the self-adaptive filtering reference channel signal.
The function of the adaptive filter module 5 is: according to the change of the statistical characteristics of the input signals, the filter parameters of the filter are adjusted in a self-adaptive mode, and the requirement of the least square criterion is met.
The function of the error determination module 6 is: the error signal and the error vector inner product are determined, and the iteration number of the adaptive filter module 5 and the output of the final error signal are controlled.
The dual-antenna radar clutter suppression output module 7 has the functions of: the error signal finally output by the error determination module 6 is read.
The output of the dipole antenna receiving channel module 2 is used as the input of the reference signal input module 4; the output of the reference signal input module 4 serves as the sum channel input of the error determination module 6; the output of the monopole receiving channel module is used as the input of the input signal module 3; the output of the input signal module 3 serves as the input of the adaptive filter module 5; the output of the adaptive filter module 5 is input as the difference channel of the error determination module 6. The error vector inner product output of the error determination module 6 is used as the iteration control input of the adaptive filter module 5, and the error signal output of the error determination module 6 is the input of the dual-antenna radar clutter suppression output module 7.
The second step of the dipole antenna receiving channel module 2 completes the reception of the echo of the surface and the subsurface of the satellite body of the point under the satellite or the point not under the satellite
By utilizing the characteristic that the dipole antenna wave beam covers the detection areas of the points under the satellite and the points under the non-satellite, the dipole antenna receiving channel module 2 realizes the reception of the echoes of the points under the satellite, the surfaces of the star bodies of the points under the non-satellite and the sub-surfaces.
Thirdly, the monopole receiving channel module completes the reception of the surface and subsurface echoes of the star body of the sub-star point
By utilizing the characteristic that the gain of the monopole antenna beam at the sub-satellite point is very small, the monopole antenna receiving channel module 1 realizes the reception of the echo of the sub-surface and the surface of the non-sub-satellite point.
The fourth step is that the input signal module 3 finishes the reading-in of the main channel signal of the adaptive filter
The input signal module 3 reads the output signal of the monopole antenna receiving channel module 1, and outputs the output signal as the input signal of the adaptive filter module 5 after preprocessing.
The fifth step, the reference signal input module 4 finishes the reading-in of the self-adaptive filtering reference channel signal
The reference signal input module 4 reads the output signal of the dipole antenna receiving channel module 2, and outputs the output signal as the reference signal of the adaptive filter module 5 after preprocessing.
Sixth step adaptive filter module 5 adjusts filter parameters
The adaptive filter module 5 adjusts the weight of the filter according to the statistical characteristic change of the input signal of the error determination module 6 and the selected adaptive filter model, and outputs the latest filtering signal.
The seventh step error determination module 6 calculates the inner product of the error vectors
The error determining module 6 calculates an error between the reference signal and the filtered output signal of the adaptive filter module 5 to obtain an error vector, and further calculates an inner product of the error signal, and when the inner product meets a least square criterion, the adaptive filter module 5 is controlled to stop iteration.
Input signal：。
Adaptive filter weights：。
The adaptive filter module 5 outputs a signal:。
reference signal：。
Error signal：。
Wherein,1 st, 2 nd and 2 nd of the input signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of reference signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of error signal respectivelySampled signal values of the signals.
1 st, 2 nd and 2 nd of error signal respectivelyAnd filter weights.
Inner product of error signal：
Is composed ofThe function of the transposition of (a) to (b),is the first of the error signalThe number of the sampled values is determined,is a serial number.
Eighth step, the dual-antenna radar clutter suppression output module 7 reads the output error signal of the error determination module 6
When the adaptive filter module 5 stops iteration, the dual-antenna radar clutter suppression output module 7 reads the error signal output by the error determination module 6, and the error signal is used as a star subsurface detection signal after radar clutter suppression.
Therefore, clutter suppression of the on-orbit star underground detection radar is completed.
Claims (1)
1. An on-orbit star underground detection radar clutter suppression method is characterized by comprising the following specific steps:
first step of building radar clutter suppression system
A radar clutter suppression system comprising: the device comprises a dipole antenna receiving channel module (2), a monopole antenna receiving channel module (1), an input signal module (3), a reference signal input module (4), an adaptive filter module (5), an error determination module (6) and a dual-antenna radar clutter suppression output module (7);
the function of the dipole antenna receiving channel module (2) is as follows: completing the reception of the echoes of the surfaces of the subsatellite point, the non-subsatellite point and the sub-surface;
the monopole antenna receiving channel module (1) has the functions of: completing the reception of the surface and subsurface echoes of the subsatellite point star body;
the function of the input signal module (3) is as follows: completing the reading-in of the main channel signal of the adaptive filter;
the reference signal input module (4) has the functions of: completing the reading-in of the self-adaptive filtering reference channel signal;
the function of the adaptive filter module (5) is: according to the statistical characteristic change of the input signal, self filter parameters are adjusted in a self-adaptive mode, and the requirement of a least square criterion is met;
the function of the error determination module (6) is: determining an error signal and an error vector inner product, and controlling the iteration times of the self-adaptive filter module (5) and the output of a final error signal;
the dual-antenna radar clutter suppression output module (7) has the functions of: reading an error signal finally output by the error determination module (6);
the output of the dipole antenna receiving channel module (2) is used as the input of the reference signal input module (4); the output of the reference signal input module (4) is used as the sum channel input of the error determination module (6); the output of the monopole receiving channel module is used as the input of the input signal module (3); the output of the input signal module (3) is used as the input of the adaptive filter module (5); the output of the adaptive filter module (5) is used as the difference channel input of the error determination module (6); the error vector inner product output of the error determining module (6) is used as the iteration control input of the adaptive filter module (5), and the error signal output of the error determining module (6) is the input of the dual-antenna radar clutter suppression output module (7);
the second step of the dipole antenna receiving channel module (2) completes the reception of the echo of the surface and the subsurface of the satellite at the subsatellite point and the non-subsatellite point
By utilizing the characteristic that the dipole antenna wave beam covers the detection areas of the points under the satellite and the points under the non-satellite, the dipole antenna receiving channel module (2) realizes the reception of the echoes of the points under the satellite, the surfaces of the star bodies of the points under the non-satellite and the subsurface;
thirdly, the monopole receiving channel module completes the reception of the surface and subsurface echoes of the star body of the sub-star point
By utilizing the characteristic that the gain of a monopole antenna beam at a sub-satellite point is very small, the monopole antenna receiving channel module (1) realizes the reception of the echo of the surface and the sub-surface of a non-sub-satellite point satellite;
fourthly, the input signal module (3) finishes the reading of the main channel signal of the adaptive filter
The input signal module (3) reads the output signal of the monopole antenna receiving channel module (1), and outputs the output signal as the input signal of the adaptive filter module (5) after preprocessing;
the fifth step is that a reference signal input module (4) finishes the reading-in of the self-adaptive filtering reference channel signal
The reference signal input module (4) reads the output signal of the dipole antenna receiving channel module (2), and outputs the output signal as a reference signal of the adaptive filter module (5) after preprocessing;
the sixth step is that the adaptive filter module (5) adjusts the filter parameters
The self-adaptive filter module (5) adjusts the weight of the filter according to the statistical characteristic change of the input signal of the error determination module (6) and the selected self-adaptive filter model, and outputs the latest filtering signal;
the seventh step is that the error determination module (6) calculates the inner product of the error vectors
The error determining module (6) calculates the error between the reference signal and the filtering output signal of the adaptive filter module (5) to obtain an error vector, and further calculates the inner product of the error signal, and when the inner product meets the least square criterion, the adaptive filter module (5) is controlled to stop iteration;
input signal：；
Adaptive filter weights：；
The adaptive filter module (5) outputs a signal:；
reference signal：；
Error signal：；
Wherein,1 st, 2 nd and 2 nd of the input signal respectivelySampled signal values of the signals;
1 st, 2 nd and 2 nd of reference signal respectivelySampled signal values of the signals;
1 st, 2 nd and 2 nd of error signal respectivelySampled signal values of the signals;
1 st, 2 nd and 2 nd of error signal respectivelyA filter weight;
inner product of error signal：
Is composed ofThe function of the transposition of (a) to (b),is the first of the error signalThe number of the sampled values is determined,is a serial number;
eighth step, the dual-antenna radar clutter suppression output module (7) reads the output error signal of the error determination module (6)
When the adaptive filter module (5) stops iteration, the dual-antenna radar clutter suppression output module (7) reads an error signal output by the error determination module (6) and uses the error signal as a star subsurface detection signal after radar clutter suppression;
therefore, clutter suppression of the on-orbit star underground detection radar is completed.
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