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SAR radio frequency interference suppression method based on low rank and dual sparse matrix decomposition

A radio frequency interference, sparse matrix technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problem of inaccurate models, improve model accuracy, achieve RFI suppression, and reduce reconstruction errors. Effect

Pending Publication Date: 2021-11-19
XIDIAN UNIV
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Problems solved by technology

However, this method only uses part of the characteristics of the interference and signal, and the model is not accurate enough, which will cause certain reconstruction errors

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  • SAR radio frequency interference suppression method based on low rank and dual sparse matrix decomposition
  • SAR radio frequency interference suppression method based on low rank and dual sparse matrix decomposition
  • SAR radio frequency interference suppression method based on low rank and dual sparse matrix decomposition

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0023] refer to figure 1 , a kind of SAR radio frequency interference suppression method based on low rank and double sparse matrix decomposition provided by the present invention, comprises the following steps:

[0024] Step 1. Establish a single RFI-containing echo model of the SAR along the azimuth direction, and use the short-time Fourier transform to convert the single-time RFI-containing echo signal to the time-frequency domain to obtain the time-frequency domain echo signal;

[0025] A single echo of SAR along the azimuth direction can be expressed as a linear superposition form of signal, interference and noise:

[0026] s(k)=x(k)+i(k)+n(k)

[0027] Among them, ...

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Abstract

The invention belongs to the technical field of SAR signal processing, and discloses an SAR radio frequency interference suppression method based on low rank and dual sparse matrix decomposition. On the basis of SAR echo signal time-frequency characteristic analysis, what is proposed is that an RFI time-frequency matrix has low-rank and sparse characteristics, and in combination with sparsity of a target echo signal, an SAR echo signal separation model combining low-rank and double sparse characteristic constraints is established. And the multi-constrained signal separation optimization problem is converted into two optimization solution sub-problems by adopting an alternating iterative projection strategy: interference low-rank reconstruction and signal sparse recovery. In order to solve the problem of low-rank reconstruction of interference, a bilateral random projection strategy is adopted to carry out low-rank estimation, and sparse solution of RFI and target echo signals is realized in combination with a hard threshold method. According to the method, the RFI is subjected to refined constraint, so that the model is more accurate, and the fitting precision of the model to the data is improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and further relates to a radio frequency interference suppression method based on low rank and double sparse matrix decomposition in the field of synthetic aperture radar (SAR) signal processing. The invention can be used to suppress the radio frequency interference (RFI) in the SAR echo signal, recover the covered target information, obtain high-quality target imaging effect, and significantly enhance the SAR image interpretation capability. Background technique [0002] SAR has the advantages of all-day, all-weather, long range, large surveying and mapping bandwidth, high-resolution imaging, etc., and has broad application prospects in the fields of target detection and identification, resource exploration and geological surveying and mapping. However, with the rapid increase of electromagnetic radiation sources and the overlapping utilization of spectrum resources, the electrom...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9021
Inventor 周峰张照东丁毅樊伟伟田甜石晓然刘磊
Owner XIDIAN UNIV
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