A Non-stationary Clutter Suppression Method for Bibase Forward-Look SAR Based on Cascade Cancellation

A non-stationary clutter, bi-base forward-looking technology, applied in the field of radar, can solve the problems of DPCA clutter suppression performance degradation, failure, and affecting clutter suppression effect, so as to eliminate serious distance non-stationarity, realize suppression, and solve The effect of clutter difficult suppression problem

Active Publication Date: 2021-01-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the long observation time and high resolution requirements of bistatic forward-looking radar, this assumption is invalid in BFSAR
At the same time, the severe clutter distance non-stationarity in bistatic forward-looking SAR will seriously affect the clutter suppression effect
DPCA is based on the method of clutter cancellation to achieve clutter suppression; however, in bistatic forward-looking SAR, it is difficult to meet the center coincidence of the previous receiving phase and the following receiving phase due to the separation of transceivers, resulting in DPCA clutter Inhibition of performance degradation

Method used

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  • A Non-stationary Clutter Suppression Method for Bibase Forward-Look SAR Based on Cascade Cancellation
  • A Non-stationary Clutter Suppression Method for Bibase Forward-Look SAR Based on Cascade Cancellation
  • A Non-stationary Clutter Suppression Method for Bibase Forward-Look SAR Based on Cascade Cancellation

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Embodiment Construction

[0048] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0049] Such as figure 1 As shown, in this embodiment, echo data processing of three channels is taken as an example for description, that is, N=3. A kind of bistatic forward-looking SAR non-stationary clutter suppression method based on cascade cancellation of the present invention comprises:

[0050] S1. Receive echoes from 3 channels and perform preprocessing; including the following sub-steps:

[0051] S11. Establish a BFSAR space geometry structure and complete parameter initialization;

[0052] The BFSAR geometric structure adopted by the embodiment of the present invention is as follows figure 2 As shown, the system parameter table used is shown in Table 1, where the position coordinates of the transmitting station at zero time are (X ...

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Abstract

The invention discloses a bistatic forward-looking SAR non-stationary clutter suppression method based on cascade cancellation, which is applied to the field of clutter suppression in synthetic aperture radar moving target detection. The bistatic clutter has strong non-stationary characteristics, and the traditional space-time adaptive method cannot accurately estimate the covariance matrix of the clutter, which leads to the problem that the performance of clutter suppression is seriously degraded. The present invention first adopts the deskewing pre-filter and Keystone transform They are respectively used to remove Doppler ambiguity and correct range unit migration; then use time-division STAP echo domain processing to initially suppress bistatic forward-looking SAR non-stationary clutter and improve signal-to-noise ratio; finally use DPCA image domain based on BP imaging processing, reducing the clutter unit, fully suppressing the residual non-stationary clutter, and further improving the signal-to-clutter ratio, thereby realizing the detection of moving targets.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to a clutter suppression technology in the detection of a synthetic aperture radar moving target. Background technique [0002] Bistatic forward-looking synthetic aperture radar (BFSAR) is a radar mode that uses separate transceivers to obtain information directly in front of the radar. BFSAR was originally used to obtain forward-looking high-resolution imaging. With the increasing demand for moving target information acquisition, the combination of BFSAR and moving target detection technology has been promoted. However, the echoes of moving targets under the bistatic forward-looking SAR configuration are often will be submerged by strong clutter, therefore, clutter suppression has become a key step in moving target detection. [0003] The clutter non-stationarity means that the angle-Doppler trace of the clutter changes with the change of the range unit, and there is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S7/292
CPCG01S7/2923G01S7/41
Inventor 李中余刘竹天余怀秦李山川武俊杰黄钰林杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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