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Linear array SAR (synthetic aperture radar) three-dimensional imaging method based on compressed sensing

A technology of three-dimensional imaging and compressed sensing, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as low-resolution multi-element large data collection and storage burden

Inactive Publication Date: 2012-01-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0008] In order to overcome the shortcomings of the existing linear array SAR system and matched filter imaging algorithm in the cross-track direction, low resolution, multi-array elements and large data collection and storage burden, the present invention provides a linear array SAR based on compress

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  • Linear array SAR (synthetic aperture radar) three-dimensional imaging method based on compressed sensing
  • Linear array SAR (synthetic aperture radar) three-dimensional imaging method based on compressed sensing
  • Linear array SAR (synthetic aperture radar) three-dimensional imaging method based on compressed sensing

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[0060] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0061] Step 1. Use computer simulation to generate linear array SAR simulation data. The system parameters required for simulation are as follows: Figure 4 As shown, and define the synthetic aperture radar imaging space and initialize the imaging system parameters.

[0062] Initialize the relative ground velocity vector of the linear array platform Linear array antenna working center frequency λ = 0.03m, linear array antenna element number N = 501, spacing between adjacent elements d = λ / 2 = 0.015m, linear array length L = 7.5m, linear array transmitting antenna Element initial position vector The initial position vector of the i-th receiving antenna element of the linear array i = 1, 2, ..., N, using the formula Get the position vector at the nth PRF moment of the...

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Abstract

The invention provides a linear array SAR (synthetic aperture radar) imaging algorithm based on compressed sensing. Aiming at the characteristic that the scattering targets are sparse in an actual linear array SAR three-dimensional scene space, the method comprises the following steps of: only selecting less linear array antenna array elements to work in stead of adopting full array elements to receive an echoed signal; performing two-dimensional compression on the distance direction and along-track direction of the linear array SAR echoed data by utilizing a matched filtering technology; establishing a linear measuring matrix of a cross track direction signal and a sparse target scattering coefficient by adopting a compressed sensing technology; and finally, reconfiguring a cross track direction target through solving an optimization problem to realize sparse target imaging processing in a three-dimensional space. By using the method, the defect of the existing linear array SAR matched filtering imaging algorithm can be overcome, the linear array antenna array element quantity and system data acquiring and storage burden are greatly reduced, and the cross track direction imaging precision of the linear array SAR is improved.

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] Synthetic Aperture Radar (SAR) is a high-resolution microwave imaging system. Synthetic aperture radar relies on the relative motion between the radar and the target to synthesize a virtual array to obtain high resolution in the azimuth direction, and uses a large bandwidth signal to achieve high resolution in the range direction, and can perform two-dimensional imaging of the illuminated scene. The linear array synthetic aperture radar (Linear array SAR) 3D imaging system is a new type of synthetic aperture radar system that installs the linear array antenna on the moving platform. The linear array SAR 3D imaging system places a line array antenna in the tangential track direction (perpendicular to the range direction - along the track direction plane), uses pulse co...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张晓玲韦顺军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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