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Circumference SAR back projection self-focusing method based on subaperture synthesis

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

Inactive Publication Date: 2015-06-24
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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  • Circumference SAR back projection self-focusing method based on subaperture synthesis
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  • Circumference SAR back projection self-focusing method based on subaperture 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 circumference SAR back projection self-focusing method based on subaperture synthesis. The method includes the steps of dividing circumference SAR full-aperture echo data into subaperture echo data, selecting a strong scattering unit in an observation scene to conduct back projection self-focusing processing based on image acutance maximization so that the phase error of each subaperture echo datum can be estimated, synthesizing the phase errors of all the subaperature echo data into the circumference SAR full-aperture echo data phase error, and finally obtaining the circumference SAR full-aperture echo data phase error so that the accurate circumference SAR back projection imaging can be conducted. Compared with an existing circumference SAR back projection self-focusing algorithm, the method has the advantages of being high in imaging accuracy and speed and is suitable for processing circumference SAR large-scene measured data.

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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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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