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
CN113671498APending Publication Date: 2021-11-19XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2021-11-19

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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.
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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...

Claims

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