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| Real-time Image Formation for Airborne High Resolution Spotlight SAR Based on FPGA |
| Zhou Fang Tang Yu Zhang Jia-jia Xing Meng-dao Wang Yu |
| Key Laboratory for Radar Signal Processing, Xidian University, Xi'an 710071, China |
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Abstract This paper designs and realizes a real-time image processor for SAR based on Field Programmable Gate Arrays (FPGA). The system is suitable for high resolution airborne spotlight mode SAR. The scheme applies the Polar Format Algorithm (PFA) first. Then the motion error phase is estimated and compensated in azimuth wavenumber domain. In this paper, the design approaches and the hardware system architecture are given and the resource usage, processing speed and image result are analyzed in detail. The real-time experiment results show that the system can process 1024 MB SAR raw data within 11 s, when the FPGA processing units work at 100 MHz. The good experimental image also proves the validity and reliability of the proposed system.
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Received: 03 September 2010
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Corresponding Authors:
Zhou Fang
E-mail: xdzhoufang@163.com
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2011, Vol. 33 
