Hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method

A sparse imaging, hard threshold technology, applied in radio wave measurement system, radio wave reflection/re-radiation, using re-radiation, etc.

Active Publication Date: 2014-04-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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According to my knowledge, there is currently no linear SAR...

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  • Hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method
  • Hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method
  • Hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method

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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 invention provides a hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method. A linear measurement matrix of original echo signals of a linear array SAR and scattering coefficients in a target space of an observed scene is established for the characteristic that main scattering targets are spatially sparse in the target space of the observed scene of the linear array SAR, and contrast between maximum and minimum target scattering coefficients and a target scattering coefficient change rate are used as iteration ending conditions for the iteration processing of a hard threshold OMP algorithm, so that the dependence of a conventional OMP algorithm on the number of the main scattering targets in linear array SAR sparse imaging is overcome. Compared with a conventional OMP algorithm-based linear array SAR sparse imaging method, so that the method has the advantages that the number of the main scattering targets in the target space of the observed scene is not required to be known, and the method is more applicable to the linear array SAR sparse imaging when the number of the main scattering targets is unknown under actual conditions; the imaging accuracy of the linear array SAR is improved. The method can be applied to the fields of SAR imaging, earth remote sensing and the like.

Description

technical field [0001] The technical invention belongs to the field of radar technology, and in particular relates to the field of synthetic aperture radar (SAR) imaging technology. 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...

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Application Information

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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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