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

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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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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