Circular SAR backprojection self-focusing method based on sub-aperture synthesis

A back projection and sub-aperture technology, which is applied in the fields of circular SAR high-precision motion compensation and synthetic aperture radar high-resolution imaging, can solve the problems of large memory consumption, inability to accurately estimate phase error, and affecting imaging accuracy, etc.

Inactive Publication Date: 2017-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the actual imaging of circular SAR, due to the anisotropy of the radar cross section (Radar Cross Section, RCS) of the target, the existing circular SAR back projection self-focusing algorithm cannot accurately estimate the phase error, which affects the imaging accuracy
And the existing circular SAR back projection self-focusing algorithm consumes a huge amount of memory, and the imaging speed is very slow

Method used

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  • Circular SAR backprojection self-focusing method based on sub-aperture synthesis
  • Circular SAR backprojection self-focusing method based on sub-aperture synthesis
  • Circular SAR backprojection self-focusing method based on sub-aperture synthesis

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Embodiment Construction

[0060] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLABR2012b. The specific implementation steps are as follows:

[0061] Step 1. Initialize circular SAR system parameters and echo data

[0062] The initial parameters of the circular SAR system include: the initial position vector P of the radar platform 0 =[0,1000,1000],x 0 = 0m is the initial position of the platform on the transverse axis of the horizontal plane, y 0 = 1000m is the initial position of the platform on the longitudinal axis of the horizontal plane, z 0 =1000m is the initial position of the platform above the vertical height of the ground; the initial velocity vector of the platform V=[150,0,0]m / s, where v x =150m / s is the velocity of the platform on the transverse axis of the horizontal plane, v y = 0m / s is the velocity of the platform in the longitudinal direction of the horizontal plane, v z = 0m / s ...

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Abstract

The invention discloses a circular SAR back projection self-focusing method based on sub-aperture synthesis. It divides the circular SAR full-aperture echo data into sub-aperture echo data, and selects strong scattering units in the observation scene to perform image sharpening based The phase error of each sub-aperture echo data is estimated by the back-projection autofocus processing with maximum degree, and then the phase errors of all sub-aperture echo data are synthesized into the phase error of the circular SAR full-aperture echo data, and finally the solved circular SAR full-aperture echo data phase error for accurate circular SAR backprojection imaging. Compared with the existing circumferential SAR back projection self-focusing algorithm, the method of the invention has the characteristics of high imaging precision and fast speed, and is suitable for processing the measured data of the large scene of the circumferential SAR.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR) high-resolution imaging, and particularly relates to the technical field of circular SAR high-precision motion compensation. Background technique [0002] Synthetic aperture radar (SAR) is a high-resolution microwave imaging system that can work all-weather and all-weather. It can obtain better imaging results in harsh environments, so it is widely used in civilian and military fields. In applications such as reconnaissance, terrain mapping, and resource detection, SAR can obtain high-resolution microwave images. [0003] Circular Synthetic Aperture Radar (CSAR) is a curved synthetic aperture radar mode that forms a circular aperture in the tangential and along-track directions. This mode is to use the radar carrier to fly around the center of the scene to form a circular trajectory and illuminate the imaging scene, and then process the collected e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9017G01S13/9088G01S13/9019
Inventor 张晓玲张博军韦顺军胡克彬
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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