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Flow structure non-uniform linear motion synthetic aperture radar imaging method

A synthetic aperture radar, aperture technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as large memory consumption

Inactive Publication Date: 2013-07-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the large memory consumption of the back projection algorithm on the FPGA and GPU platforms, the present invention proposes a flow structure non-uniform linear motion synthetic aperture radar imaging method

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  • Flow structure non-uniform linear motion synthetic aperture radar imaging method
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  • Flow structure non-uniform linear motion synthetic aperture radar imaging method

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Embodiment Construction

[0097] In order to verify the feasibility of the method proposed in the present invention, the applicant has carried out the actual measurement data processing experiment using the GTX590 GPU device of NVidia company as the platform.

[0098] Step 1. Initialize imaging processing parameters

[0099] In order to realize the synthetic aperture radar imaging processing, the imaging system needs to provide the following initialization parameters, including: working wavelength λ=0.05m; transmitting signal time width T Puls =10us; receiver sampling frequency f s =500MHz; receive gate delay T Delay =70us; the number of sampling points in the distance direction N r =10000; the number of pulse repetition cycles N included in the SAR antenna phase center data file Azi =10000; the theoretical resolution ρ of the imaging system in the range direction r =1m; the theoretical resolution of the imaging system in the azimuth direction ρ a =1m; Synthetic Aperture Radar Squint Offset Disp ...

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Abstract

The invention discloses a flow structure non-uniform linear motion synthetic aperture radar imaging method. According to the method, a circular buffering data structure is adopted to improve a traditional working mode in which matching is achieved by means of the back-projection algorithm in a pixel-by-pixel mode to a working mode of synthetic aperture sliding window projection, the data size needing to be stored in a internal storage of a processing system is enabled to be irrelevant to azimuth length of a scene to be processed at any time, and the problem that internal storage consumption is large in an actual synthetic aperture radar imaging process is solved; and non-uniform linear motion synthetic aperture radar high-precision imaging processing is achieved by replacing platform average speed in a traditional imaging process with antenna phase centrode. The flow structure non-uniform linear motion synthetic aperture radar imaging method can be used for real-time or off-line imaging processing of onboard synthetic aperture radar data of various working modes.

Description

technical field [0001] The invention belongs to the technical field of radar, and particularly relates to the technical field of synthetic aperture radar imaging. Background technique [0002] High-precision imaging processing method is one of the important issues in the field of synthetic aperture radar research. High-precision synthetic aperture radar images are of great significance for improving SAR interferometric phase extraction accuracy, image recognition accuracy, and expanding the application range of synthetic aperture radar. According to the documents known to the inventor and published, for example: Documents: H. Cantalloube; P. Dubois-Fernandez, "Airborne X-band SAR imaging with 10cm resolution: technical challenge and preliminary results", IEE Proceedings-Radar, Sonar and Navigation , vol.153, Issue: 2, pp.163-176, 2006, and references WeiXian Tan; DaoJing Li; Wen Hong, "Airborne Spotlight SAR Imaging with Super High Resolution based on Back-Projection and Aut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 师君张晓玲马龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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