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SRC Imaging Method of De-chirped Broadband LFM Signal and Its Real Time Implementation |
Yao Ping①②; Zhang Tao②; Li Ming-feng②; Wang Zhen-song② |
①Institute of Electronics; Chinese Academy of Sciences Beijing 100080 China;②Institute of Computing Technology,Chinese Academy of Sciences, Beijing 100080, China |
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Abstract Based on the analysis of the time and frequency domain character of the de-chirped broadband LFM signal, this paper presents the SRC imaging method of S AR with de-chirped LFM signal. In comparison with the RD and SRC method of normal LFM signal with the same swath and resolution, this method is proved suitable for real time processing with a decrease of data to be processed and a little amount of calculation increased. Data collected in de-chirp LFM SAR system is formed into images with this method and demonstrates it is better than RD to form fine-resolution images when there exits a squint angle in SAR system, which is usually the case in reality.
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Received: 30 August 2002
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