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| A Frequency-domain Algorithm Based on Local Cartesian Coordinate and Subregion Processing for Missile-borne SAR Imaging |
| BIE Bowen①② SUN Lu③ XING Mengdao①② LIANG Yi①② SUN Guangcai①② |
①(National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China)
②(Collaborative Innovation Center of Information Sensing and Understand, Xidian University, Xi’an 710071, China)
③(China Air Force Equipment Headquarter, Beijing 100843, China) |
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Abstract The missile-borne SAR platform has the characteristics of nonlinear trajectory and high-squint mode. A frequency-domain imaging algorithm based on local Cartesian coordinate and subregion processing is proposed. For high-squint mode, the range model is built in local Cartesian coordinate to match accurately the azimuth signal after range walk correction. To compensate the azimuth-dependent range cell migration and Doppler parameters accurately, the imaging area is divided into several subregions. The final focused image can be obtained when all the subregion images are interpolated uniformly into the ground coordinate. Finally, the point targets simulation and real SAR data verify the effectiveness of the proposed algorithm.
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Received: 24 November 2017
Published: 23 May 2018
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| Fund:The National Natural Science Foundation of China (61621005), The High Resolution Earth Observation System major Project (41-Y20A13-9001-15116) |
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Corresponding Authors:
BIE Bowen
E-mail: biebowen@gmail.com
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