Improved chirp scaling algorithm for parallel-track bistatic SAR |
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Authors: | Li Feng Li Shu Zhao Yigong |
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Institution: | 1. School of Electronics Engineering, Xidian Univ., Xi'an 710071, P. R. China;Dept. of Information Science and Electronic Engineering, Zhejiang Univ., Hangzhou 310058, P. R. China 2. EAAF Equipment Inst. of Land-based Air Defense, Beijing 100085, P. R. China 3. School of Electronics Engineering, Xidian Univ., Xi'an 710071, P. R. China |
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Abstract: | The curvature factor of the parallel-track bistatic SAR is range dependent, even without variation of the effective velocity. Accounting for this new characteristic, a parallel-track chirp scaling algorithm (CSA) is derived, by introducing the method of removal of range walk (RRW) in the time domain. Using the RRW before the CSA, this method can reduce the varying range of the curvature factor, without increasing the computation load obviously. The azimuth dependence of the azimuth-FM rate, resulting from the RRW, is compensated by the nonlinear chirp scaling factor. Therefore, the algorithm is extended into stripmap imaging. The realization of the method is presented and is verified by the simulation results. |
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Keywords: | bistatic synthetic aperture radar chirp scaling range walk curvature factor parallel track |
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