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Sparse Imaging Method for Linear Array SAR Based on Hard Threshold Orthogonal Matching Pursuit

A quadrature matching tracking, hard threshold technology, used in radio wave measurement systems, reflection/re-radiation of radio waves, use of re-radiation, etc.

Active Publication Date: 2016-01-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

According to my knowledge, there is currently no linear array SAR sparse reconstruction imaging method based on hard-threshold orthogonal matching pursuit

Method used

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  • Sparse Imaging Method for Linear Array SAR Based on Hard Threshold Orthogonal Matching Pursuit
  • Sparse Imaging Method for Linear Array SAR Based on Hard Threshold Orthogonal Matching Pursuit
  • Sparse Imaging Method for Linear Array SAR Based on Hard Threshold Orthogonal Matching Pursuit

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Embodiment Construction

[0073] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified on MATLABR2008b. The specific implementation steps are as follows:

[0074] Step 1. Initialize the linear array SAR system parameters required for simulation:

[0075] Initialize the values ​​of the linear array SAR system parameters such as image 3 shown, including: motion platform velocity vector The total number of array elements of the linear array antenna N=201, the initial position vector of each array element of the linear array antenna Where n is the array element number of the nth linear array antenna, n=1,2,...,N, N=201, the length of the linear array antenna is L=3m, and the distance between adjacent array elements of the linear array antenna is d= 0.015m, radar center frequency f c =10GHz, the signal width B of the baseband signal of the radar transmitter r =300MHz, radar transmit signal pulse width T P =10 -6 s, frequency m...

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Abstract

The present invention provides a linear array SAR sparse imaging method based on a hard threshold OMP, which is aimed at the spatially sparse characteristics of the main scattering target in the linear array SAR observation scene object space, by establishing the linear array SAR original echo signal and observation The linear measurement matrix of the scattering coefficient in the scene target space, using the maximum and minimum contrast of the target scattering coefficient and the change rate of the target scattering coefficient as the iteration termination condition of the iterative processing of the hard threshold OMP algorithm, overcomes the traditional orthogonal matching pursuit algorithm in linear SAR sparse imaging Dependence on the number of main scattering targets, compared with linear array SAR sparse imaging based on the traditional orthogonal matching pursuit algorithm, it does not need to know the number of main scattering targets in the target space of the observation scene, and is more suitable for main scattering targets in actual situations Sparse imaging of linear array SAR when the number is unknown; Improving the imaging accuracy of linear array SAR. The invention can be applied to the fields of synthetic aperture radar imaging, earth remote sensing and the like.

Description

technical field [0001] The technical invention belongs to the technical field of radar, and in particular relates to the technical field of synthetic aperture radar (SAR) imaging. Background technique [0002] Traditional Synthetic Aperture Radar (SAR) uses the linear motion of a single antenna to synthesize a one-dimensional virtual linear array antenna to obtain high resolution in the azimuth direction, and then uses pulse compression technology to obtain high resolution in the radar line of sight direction, thereby realizing two-dimensional imaging of the observation scene . However, due to the terrain occlusion shadow effect and symmetrical blurring problems during side-view imaging, 2D SAR cannot obtain satisfactory imaging results in complex undulating terrains such as cities, mountains, and canyons. The basic principle of 3D SAR is to synthesize a virtual 2D area array antenna through antenna movement to obtain 2D high resolution in the plane of the array, and then c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904
Inventor 张晓玲韦顺军师同彦何蜀丰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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