Squint SAR ground moving target extracting method

A ground moving target and extraction method technology, applied in the field of squint SAR ground moving target extraction, can solve the problems of processing, unable to determine the defocus of the original image, etc.

Active Publication Date: 2015-06-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in general, it is not possible to determine to what extent the original image was defocused; moreover, weak targets are covered by echoes from strongly scattered targets

Method used

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  • Squint SAR ground moving target extracting method
  • Squint SAR ground moving target extracting method
  • Squint SAR ground moving target extracting method

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Embodiment Construction

[0077] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctness on Matlab2012. The technical solution of the present invention will be further described in detail with respect to specific embodiments and accompanying drawings.

[0078] Such as figure 1 As shown, a ground moving target extraction method for squint SAR, firstly remove the moving target and the first-order RCM of the stationary scene. Then the second-order range migration correction is performed in the range frequency domain, azimuth time domain and the range compression is completed. Then, the Doppler center of mass and frequency modulation slope of the static target point are equalized by using the variable parameter extended azimuth nonlinear CS algorithm, and then the corresponding deskewing factor is used for azimuth focusing; finally, the two images are focused in the azimuth frequency domain and the distance time After subtr...

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Abstract

The invention discloses a squint SAR ground moving target extracting method. The squint SAR ground moving target extracting method comprises the following steps that 1, echo signals of a stationary target and a moving target are computed; 2, range direction Fourier transformation is carried out; 3, consistent range walk correction is carried out on a range frequency domain and an orientation time domain; 4, range direction residual phase compensation is carried out; 5, variable parameter extension azimuth nonlinear CS is carried out; 6 the echo signals subjected to the extension azimuth nonlinear CS are multiplied by corresponding azimuth minus factors respectively and are transformed to the azimuth frequency domain; 7, the amplitudes of the two echoes are subtracted, the echo of the stationary target is removed, and stationary target clutter suppression is achieved; 8, amplitude detection and moving target extraction are carried out. The method solves the problems that the range and azimuth are coupled seriously in a ground moving target under the single-channel squint mode and moving target movement parameters are unknown, estimation of movement parameters is not needed, efficiency is higher, and the method can be widely used in the fields of clutter suppression, moving target extraction and the like.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a squint SAR ground moving target extraction method in synthetic aperture radar (SAR) imaging technology. Background technique [0002] Squint Synthetic Aperture Radar (SAR) can change the beam pointing according to actual application requirements, and has high flexibility and mobility. It can be applied to continuous observation and reconnaissance in designated areas, and realize repeated observations of hot spots. In addition, the radar platform working in squint mode is farther away from the target scene, which increases the concealment and safety of the platform. Using squint SAR to extract moving targets on the ground can detect moving targets in advance and obtain their position information and motion parameter information. Therefore, it is of great practical significance to study the extraction of ground moving targets in squint SAR. [0003] However, there are two proble...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S7/35G01S13/90
CPCG01S7/2927G01S7/354G01S13/9029G01S13/9041
Inventor 孙稚超武俊杰杨建宇黄钰林杨海光李中余杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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