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
CN112731394AActive Publication Date: 2021-04-30NANJING UNIV OF POSTS & TELECOMM
16 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF POSTS & TELECOMM
Publication Date
2021-04-30

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More