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Bistatic forward-looking SAR non-stationary clutter suppression method based on cascade cancellation

A non-stationary clutter, dual-base forward-looking technology, applied in the field of radar, can solve the problems of DPCA clutter suppression performance degradation, failure, affecting the clutter suppression effect, etc., to eliminate serious distance non-stationarity, achieve suppression, and solve Effect of clutter difficult to suppress problem

Active Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Bistatic forward-looking SAR non-stationary clutter suppression method based on cascade cancellation
  • Bistatic forward-looking SAR non-stationary clutter suppression method based on cascade cancellation
  • Bistatic forward-looking SAR non-stationary clutter suppression method 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, and is applied to the field of clutter suppression in moving target detection of synthetic aperture radars. The method aims at solving the problem that clutter suppression performance is seriously reduced because a traditional space-time self-adaptive method cannot accurately estimate a covariance matrix of clutter due to a strong non-stationary characteristic of bistatic clutter in the prior bistatic forward-looking SAR, and comprises the following steps that a de-skew pre-filter and Keystone transformation are firstly adopted to respectively remove Doppler ambiguity and correcting range cell migration; time division STAP echo domain processing is then adopted topreliminarily inhibit bistatic forward looking SAR non-stationary clutter, and a signal-to-noise ratio is improved; and DPCA image domain processing based on BP imaging is finally adopted, a clutterunit is reduced, residual non-stationary clutter is fully inhibited, and the signal-to-clutter ratio is further improved, thereby achieving the detection of a moving target.

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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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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