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A method for suppressing radio frequency interference of spaceborne sar

A radio frequency interference and spaceborne technology, which is applied in the intersection of aerospace and microwave remote sensing, can solve problems such as the determination error of the number of main eigenvalues, and achieve the effect of stable performance and good suppression effect.

Active Publication Date: 2015-10-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, for broadband radio frequency interference, due to the wide bandwidth and high power, a large number of large eigenvalues ​​will be generated during matrix eigenvalue decomposition. Error in determining the number of values

Method used

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  • A method for suppressing radio frequency interference of spaceborne sar
  • A method for suppressing radio frequency interference of spaceborne sar
  • A method for suppressing radio frequency interference of spaceborne sar

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Embodiment Construction

[0040] figure 1 It is a principle flow chart of the spaceborne SAR radio frequency interference suppression method provided by the present invention. The whole process is divided into five steps: taking a distance line echo signal of SAR data as input, the first step: constructing a data matrix, and constructing a data matrix according to the obtained distance line echo; the second step: estimating the covariance correlation matrix, using The constructed data matrix estimates its covariance correlation matrix; the third step: eigendecomposition, performs eigendecomposition on the covariance correlation matrix estimated in the second step, obtains the eigenvalues ​​and corresponding eigenvectors, and performs eigenvalues ​​from large to large Arranged in minor order, the corresponding order of the eigenvectors also corresponds to the order of the eigenvalues. Step 4: Estimate the number of main eigenvalues ​​by wavelet decomposition, construct the interference subspace, perfor...

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Abstract

The invention provides a suppression method for satellite-borne SAR radio-frequency interference. According to the technical scheme, the method includes the steps that step1, a data matrix is constructed according to obtained range line echoes; step2, a covariance correlation matrix is estimated by using the constructed data matrix; step3, eigen decomposition is performed, and eigen values and corresponding eigen vectors are obtained and sorted; step4, the number of main eigen values is estimated through wavelet decomposition, and an interference subspace is constructed by using the eigen vectors corresponding to the estimated main eigen values; step5, interference is suppressed, data are reconstructed, and then interference suppression for broadband radio frequency is completed. The suppression method can have a good suppression effect on the narrow-band radio-frequency interference and the broadband radio-frequency interference and is steady in performance.

Description

technical field [0001] The invention belongs to the intersecting technical field of aerospace and microwave remote sensing, and in particular relates to a method for suppressing radio frequency interference in spaceborne SAR (Synthetic Aperture Radar, synthetic aperture radar) data. Background technique [0002] The space-borne SAR system can complete a wide survey zone and high-resolution earth observation, and is an effective means for military surveying and battlefield surveillance. In order to meet the growing military and civilian needs, especially the urgent need for higher resolution and hidden target reconnaissance, the working frequency band of spaceborne SAR is gradually expanded to higher and lower directions, and the electromagnetic environment it faces will become more and more serious. The more complicated it is, especially the low-band spaceborne SAR system, there are a large number of broadcast television and communication systems in the operating spectrum ra...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/023G01S13/90
Inventor 张永胜赵腾飞董臻李力何峰余安喜黄海风孙造宇金光虎何志华杜湘瑜
Owner NAT UNIV OF DEFENSE TECH