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| Imaging Study of High Squint SAR Based on FMCW |
| Liang Yi; Wang Hong-xian; Xing Meng-dao;Bao Zheng |
| National Key Lab. of Radar Signal Processing, Xidian Univ, Xi’an 710071, China |
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Abstract Based on the differences of work mechanism between Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) and Pulsed Synthetic Aperture Radar, which leads to different form of received signal, this paper establishes the model of high squint FMCW SAR echo, analyzes its characteristics, and reveals the Doppler frequency shift effect induced by the continuous motion in range direction while radar transmitting and receiving signal. Meanwhile, this paper proposes a modified RD Algorithm (RDA) for high squint FMCW SAR dechirp data, which compensates for range walk in time domain, Doppler frequency shift and range curvature in frequency domain. Point target simulation verifies the analysis and validity of the algorithm. In addition, for the Doppler frequency shift induced by the platform continuous motion, this paper also analyses its effect on imaging.
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Received: 29 November 2007
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2009, Vol. 31 
