SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition

A Bayesian theory and broadband interference technology, applied in the field of microwave remote sensing, can solve the problem that the universality of measured data has not been effectively verified, and achieve the effect of improving robustness and simplifying direct inference problems.

Pending Publication Date: 2021-01-26
XIDIAN UNIV
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Problems solved by technology

However, the assumption that the broadband interference is continuous along the azimuth direction has not been effectively verified for the universality of the measured data

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  • SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition
  • SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition
  • SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition

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Embodiment Construction

[0023] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0024] refer to figure 1 , the SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition provided by the invention comprises the following steps:

[0025] Step 1, establish a single echo model of SAR along the azimuth direction, and obtain the original echo signal;

[0026] Since the processing of SAR data is processed by azimuth pulses, it is only necessary to construct a single echo model along the azimuth direction. The azimuth single echo model can be expressed as a linear superposition form of signal, interference and noise:

[0027] s(k)=x(k)+i(k)+n(k)

[0028] Among them, s(k) represents the original echo signal of the k-th ra...

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Abstract

The invention belongs to the technical field of microwave remote sensing, and discloses an SAR broadband interference suppression method based on the Bayesian theory and low-rank decomposition, and the method comprises the steps: building an SAR echo representation model under a broadband interference condition; combining the Laplace distribution prior hypothesis of the time-frequency equivalent noise with the low-rank characteristic of the broadband interference time-frequency matrix to construct an SAR broadband interference reconstruction model under the maximum likelihood significance; andusing bayesian inference to estimate model parameters, so that reconstruction of an SAR broadband interference time-frequency matrix is realized, cancellation processing is performed in a data domain, and SAR echo data after interference suppression is acquired. According to the method, broadband interference can be effectively suppressed, and the robustness of the model for SAR data containing abnormal values and heavy tail noise is improved. Meanwhile, the SAR broadband interference suppression problem is converted into an optimization solution problem under a Bayesian framework, and the model parameter estimation precision is improved.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing, in particular to a SAR broadband interference suppression method based on Bayesian theory and low-rank decomposition. It can be used to suppress broadband interference in SAR echo signals, restore target information covered by interference, obtain high-quality target imaging effects, and significantly enhance the interpretation ability of SAR images. Background technique [0002] Synthetic Aperture Radar (SAR) is widely used in military and civilian fields such as imaging identification, resource exploration, ocean observation, geological surveying and mapping, and environmental perception due to its characteristics of all-day, all-weather, high resolution, and long range. Generally, in order to achieve high resolution, SAR will use a transmission signal with a large bandwidth, which will inevitably cause the same frequency band radio frequency interference to be mixed into the S...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/41G01S13/90
Inventor 周峰张致忠丁毅樊伟伟石晓然刘磊
Owner XIDIAN UNIV
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