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Bunching SAR clutter suppression and moving target refocusing method based on approximate observation matrix

An observation matrix and clutter suppression technology, applied in the field of radar, can solve the problems of low efficiency, high computational complexity and high storage cost

Active Publication Date: 2021-04-30
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this method needs to accumulate data and radar projection matrices into column vectors, and the computational complexity and storage cost are much higher, so it is not efficient to apply it to large scene conditions

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  • Bunching SAR clutter suppression and moving target refocusing method based on approximate observation matrix
  • Bunching SAR clutter suppression and moving target refocusing method based on approximate observation matrix
  • Bunching SAR clutter suppression and moving target refocusing method based on approximate observation matrix

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Embodiment Construction

[0070] Embodiments of the present invention will be disclosed in the following diagrams. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary.

[0071] The present invention is a kind of spotlight SAR clutter suppression and moving target refocusing based on approximate observation matrix. The spotlight SAR clutter suppression and moving target refocusing based on approximate observation matrix are realized through the following steps:

[0072] Step 1, constructing the geometric model of SAR data collection, obtain the echo signal, this signal is the mixed signal of moving target and static target;

[0073] Step 2, performing PFA imaging processing on the mixed signal, using the FRFT algorithm to estimate the motion parameters of the...

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Abstract

The invention discloses a bunching SAR clutter suppression and moving target refocusing method based on an approximate observation matrix, and the method comprises the following steps: 1, building a geometric model of SAR data collection, and obtaining an echo signal; 2, performing PFA imaging processing on the mixed signal, estimating motion parameters of the moving target by adopting an FRFT algorithm, and constructing a dictionary of a radar projection matrix of the moving target; 3, constructing a joint projection matrix of the static target and the moving target to obtain an approximate observation matrix for clutter suppression and moving target separation; and 4, constructing an iterative shrinkage threshold algorithm based on the approximate observation matrix to obtain a clutter suppressed and focused moving target image. According to the invention, clutter suppression and moving target refocusing are realized by using the joint projection matrix of the moving and static targets, and a radar projection matrix and data are prevented from being stacked into a column vector by using an approximate observation matrix method, so that the calculation complexity and the storage memory are reduced.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for suppressing clutter of a spotlight SAR and refocusing a moving target based on an approximate observation matrix. Background technique [0002] Synthetic aperture radar (SAR) is an advanced remote sensing system that has been widely used in the past few decades. SAR systems can achieve precise target classification, recognition and location finding after imaging processing, however, when there are multiple moving targets (MTs) in the illuminated scene, smearing and geometric position deviation usually appear in the constructed image , therefore, Ground Moving Target Imaging (GMTIm) has become very important and has received increasing attention in recent years. [0003] Since radar data is received in a mixed manner, the suppression of clutter and the separation of moving targets are crucial. When the Doppler frequency of the moving target is distinguishe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/36
CPCG01S13/9019G01S7/36
Inventor 王昕乔玲李涛张若愚肖玉洁杨子恒
Owner NANJING UNIV OF POSTS & TELECOMM
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