CN-121995325-A - Self-adaptive polarization filtering method and system based on radar

CN121995325ACN 121995325 ACN121995325 ACN 121995325ACN-121995325-A

Abstract

The specification provides a radar-based adaptive polarization filtering method and system, and relates to the technical field of radar signal processing. The method comprises the steps of obtaining main channel discrete data and auxiliary channel discrete data, processing the main channel discrete data with a preset weight coefficient to obtain main channel polarization data, obtaining a cancellation weight coefficient of an auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data, and carrying out polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation. The method calculates the weighting coefficients of the two channels through the orthogonal polarization channel signals, and suppresses clutter interference of the main channel in a mode of the auxiliary channel to clutter in the main channel, so that the signal-to-noise ratio is improved, the receiving quality of useful signals is effectively improved, and the target detection capability is further improved. Moreover, the mode has the advantage of automatically compensating the uneven transverse amplitude among channels, and has the advantage of easy engineering realization.

Inventors

Cheng Xiangjuan
ZHANG PAN
SUN YILONG
LI RUSONG
WAN YUHANG
WANG JIANMING
ZHOU ZILING
YANG LIXUAN
ZHANG JIAQI
JIA ZONGHENG

Assignees

北京遥感设备研究所

Dates

Publication Date: 20260508
Application Date: 20251216

Claims (10)

1. A radar-based adaptive polarization filtering method, comprising: acquiring main channel discrete data and auxiliary channel discrete data, wherein the polarization states of the main channel and the auxiliary channel are orthogonal; Processing the main channel discrete data by using a preset weight coefficient to obtain main channel polarization data; obtaining a cancellation weight coefficient of the auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data; and carrying out polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation.
2. The radar-based adaptive polarization filtering method according to claim 1, wherein the acquiring the main channel discrete data and the auxiliary channel discrete data includes: Collecting primary channel original signal data and secondary channel original signal data; respectively performing analog-to-digital conversion on the primary channel original signal data and the secondary channel original signal data to obtain digital signal data; and performing down-conversion and filtering processing on the digital signal data to respectively obtain the main channel discrete data and the auxiliary channel discrete data.
3. The radar-based adaptive polarization filtering method according to claim 1, wherein the obtaining the cancellation weight coefficient of the auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data includes: Obtaining an autocorrelation matrix of the auxiliary channel signal according to the auxiliary channel discrete data; obtaining a cross-correlation matrix of the main channel signal and the auxiliary channel signal according to the auxiliary channel discrete data and the main channel polarization data; And obtaining the cancellation weight coefficient of the auxiliary channel according to the autocorrelation matrix of the auxiliary channel signal and the cross-correlation matrix of the main channel signal and the auxiliary channel signal.
4. A radar-based adaptive polarization filtering method according to claim 3, wherein the autocorrelation matrix R HH of the auxiliary channel signal is: R HH ＝H*H T wherein h= [ H 1 ,h 2 ,…,h i ,…,h m ] T ] is the discrete data of the auxiliary channel, and H i is the discrete data of the ith auxiliary channel.
5. The radar-based adaptive polarization filtering method according to claim 4, wherein the cross-correlation matrix R HV of the main channel signal and the auxiliary channel signal is: wherein V dbf ＝[v S ,v Y ,v Z ,v D ] T is the main channel polarization data, V S 、v Y 、v Z and V D are four paths of main channel polarization data respectively, Is the conjugate transpose of V dbf .
6. The adaptive polarization filtering method based on radar according to claim 5, wherein the cancellation weight coefficient of the auxiliary channel is: W n ＝inv(R HH )*R HV Wherein W n is the cancellation weight coefficient of the auxiliary channel, and inv (R HH ) is the inverse matrix of R HH .
7. The radar-based adaptive polarization filtering method according to claim 1, wherein the performing polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation includes: Determining the maximum value of the cancellation weight coefficient according to the cancellation weight coefficient of the auxiliary channel; normalizing the cancellation weight coefficient of the auxiliary channel according to the maximum value of the cancellation weight coefficient to obtain a normalized weight coefficient of the main channel; Normalizing the main channel polarization data by using the normalization weight coefficient of the main channel to obtain normalized main channel polarization data; and carrying out polarization cancellation on the main channel polarization data after normalization processing according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation.
8. The radar-based adaptive polarization filtering method according to claim 7, wherein the main channel signal data after cancellation is: V O ＝w a V dbf -W n *H T Wherein W a is a normalized weight coefficient of the main channel, V dbf ＝[v S ,v Y ,v Z ,v D ] T is polarization data of the main channel, V S 、v Y 、v Z and V D are polarization data of four paths of main channels, W n is a cancellation weight coefficient of the auxiliary channel, h= [ H 1 ,h 2 ,…,h i ,…,h m ] T ] is discrete data of the auxiliary channel, and H i is discrete data of the ith auxiliary channel.
9. The radar-based adaptive polarization filtering method according to claim 1, wherein the cancellation weight coefficient of the auxiliary channel is calculated based on a double-precision floating point number mode of the FPGA chip.
10. A radar-based adaptive polarization filtering system, comprising: The acquisition module is used for acquiring main channel discrete data and auxiliary channel discrete data, and the polarization states of the main channel and the auxiliary channel are orthogonal; the processing module is used for processing the main channel discrete data with a preset weight coefficient to obtain main channel polarization data; The computing module is used for obtaining a cancellation weight coefficient of the auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data; And the cancellation module is used for performing polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation.

Description

Self-adaptive polarization filtering method and system based on radar Technical Field The present disclosure relates to the field of radar signal processing technologies, and in particular, to a radar-based adaptive polarization filtering method and system. Background Radar technology is widely used in the fields of meteorological monitoring, military national defense, aerospace, traffic monitoring and the like. In a traditional receiver, a filtering method often depends on a preset model or parameter, and cannot be adaptively adjusted according to different clutter environments, so that a filtering effect is poor. When the interference and the signal direction of the single-polarization adaptive receiver are the same or close, the expected signal is also easy to be seriously canceled, and under the condition of larger clutter and noise, the target detection precision is reduced, and clutter suppression is difficult. Disclosure of Invention The present disclosure is directed to a radar-based adaptive polarization filtering method that overcomes the above-described drawbacks of conventional receiver filtering methods. The embodiments of the present specification are implemented as follows: in one aspect, the present disclosure provides a radar-based adaptive polarization filtering method, which mainly includes: acquiring main channel discrete data and auxiliary channel discrete data, wherein the polarization states of the main channel and the auxiliary channel are orthogonal; Processing the main channel discrete data by using a preset weight coefficient to obtain main channel polarization data; obtaining a cancellation weight coefficient of the auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data; and carrying out polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation. In another aspect, the present disclosure provides a radar-based adaptive polarization filtering system, comprising: The acquisition module is used for acquiring main channel discrete data and auxiliary channel discrete data, and the polarization states of the main channel and the auxiliary channel are orthogonal; the processing module is used for processing the main channel discrete data with a preset weight coefficient to obtain main channel polarization data; The computing module is used for obtaining a cancellation weight coefficient of the auxiliary channel according to the auxiliary channel discrete data and the main channel polarization data; And the cancellation module is used for performing polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain main channel signal data after cancellation. Embodiments of the present description have at least the following advantages or benefits: According to the radar-based adaptive polarization filtering method, the weighting coefficients of the two channels are calculated through orthogonal polarization channel signals, clutter interference of the main channel is restrained in a mode that the auxiliary channel cancels clutter in the main channel, so that the signal to noise ratio is improved, the receiving quality of useful signals is effectively improved, and the target detection capability is further improved. Moreover, the mode has the advantage of automatically compensating the uneven transverse amplitude among channels, and has the advantage of easy engineering realization. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present description, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present description and should therefore not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Fig. 1 is a schematic flow chart of a radar-based adaptive polarization filtering method provided in the present specification; FIG. 2 is a schematic flow chart of a radar-based adaptive polarization filtering method according to the present disclosure; Fig. 3 is a schematic diagram of signal spectrum before S-path polarization in the vertical direction provided in the present specification; Fig. 4 is a schematic diagram of signal spectrum after S-path polarization in the vertical direction provided in the present specification; fig. 5 is a schematic diagram of signal spectrum before Z-path polarization in the vertical direction provided in the present specification; fig. 6 is a schematic diagram of signal spectrum after Z-path polarization in the vertical direction provided in