A Multi-Channel Based SAR Terrain Scattering Interference Suppression Method

A scatter interference and multi-channel technology, which is applied in the field of SAR terrain scatter interference suppression based on multi-channel, can solve the problem that terrain scatter interference cannot be well avoided, and achieve the effect of suppressing multi-path terrain scatter interference and improving anti-jamming performance.

Active Publication Date: 2021-08-13
BEIJING INST OF REMOTE SENSING EQUIP
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Problems solved by technology

[0012] The purpose of the present invention is to provide a multi-channel-based SAR terrain scattering interference suppression method to solve the problem that the prior art methods cannot well avoid terrain scattering interference

Method used

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  • A Multi-Channel Based SAR Terrain Scattering Interference Suppression Method
  • A Multi-Channel Based SAR Terrain Scattering Interference Suppression Method
  • A Multi-Channel Based SAR Terrain Scattering Interference Suppression Method

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Embodiment Construction

[0056] The specific steps of a multi-channel-based SAR terrain scattering interference suppression method are as follows:

[0057] The first step is to build a terrain scattering interference filtering processing system with a fixed filter structure

[0058] The terrain scatter interference filter processing system with fixed filter structure, including: channel data FFT module, fixed structure terrain scatter interference filter module, channel data IFFT module, terrain scatter interference covariance matrix estimation module, weight calculation module and SAR imaging processing module .

[0059] The function of the channel data FFT module is: transform the channel data from the time domain to the frequency domain;

[0060] The function of the terrain scattering interference filter module with a fixed structure is: to construct and filter the terrain scattering interference filter based on the characteristics of SAR imaging;

[0061] The function of the channel data IFFT mo...

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Abstract

The invention discloses a terrain scattering interference suppression method based on multi-channel SAR. First, build a terrain scatter interference pre-filter processing system with a fixed filter structure, including: channel data FFT module, fixed structure terrain scatter interference filter module, channel data IFFT module, terrain scatter interference covariance matrix estimation module, weight calculation module and SAR Image processing module. After transforming the channel data to the frequency domain, filter processing is performed, and the covariance matrix is ​​constructed using the filtered data to estimate the weight vector, and finally the space-fast time adaptive processing is realized through the weighted calculation of the weight vector and the original channel data. The invention can effectively suppress the multi-path terrain scattering interference and at the same time preserve the target intact, and improve the anti-interference performance of the SAR system.

Description

technical field [0001] The invention relates to an interference suppression method, in particular to a multi-channel-based SAR terrain scattering interference suppression method. Background technique [0002] Terrain scattering interference (also known as "thermal clutter" interference, "TSJ" in literature) is the interference formed by the energy emitted by the interference source from the side lobe or main lobe of the radar antenna after being scattered by the ground, and its energy depends on the radar The relative position of the platform and the interference source, the propagation path and the scattering characteristics of the ground. Since general radar antennas can achieve low sidelobe or ultra-low sidelobe, terrain scattering interference is mainly used as main lobe interference. Terrain scattering interference seriously affects the target detection performance of airborne radar. Since the mid-1990s, some scholars have studied the method of suppressing it. The meth...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 李然毕建权叶佩陈常平
Owner BEIJING INST OF REMOTE SENSING EQUIP
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