Research on Phase Compensating Factors in Chirp Scaling Algorithm

Wang Liang; Wang Jian; Huang Xiao-tao; Zhou Zhi-min

doi:10.3724/SP.J.1146.2005.00634

Volume 29 Issue 1

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Wang Liang, Wang Jian, Huang Xiao-tao, Zhou Zhi-min. Research on Phase Compensating Factors in Chirp Scaling Algorithm[J]. Journal of Electronics & Information Technology, 2007, 29(1): 6-11. doi: 10.3724/SP.J.1146.2005.00634

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Wang Liang, Wang Jian, Huang Xiao-tao, Zhou Zhi-min. Research on Phase Compensating Factors in Chirp Scaling Algorithm[J]. Journal of Electronics & Information Technology, 2007, 29(1): 6-11. doi: 10.3724/SP.J.1146.2005.00634

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Research on Phase Compensating Factors in Chirp Scaling Algorithm

doi: 10.3724/SP.J.1146.2005.00634

Received Date: 2005-06-06
Rev Recd Date: 2005-11-22
Publish Date: 2007-01-19

Abstract

Abstract

In this paper the two-dimensional frequency expression of SAR echoes are first analyzed. Then, the standard chirp scaling algorithm and its several modified forms used both in high frequency narrow band SAR and low frequency Ultra WideBand (UWB) SAR are compared in a united frame of two-dimensional frequency expression. The approximations made by different algorithms are evaluated in detail. So a new depiction for SAR image formation is proposed, which is a process of constructing phase compensating factors in frequency or time domain according to the characteristics of echo spectrum. Especially, the accuracy of phase compensating factors for UWB SAR echoes has a direct impact on point targets focusing. Simulation results verify that the modified non-linear chirp scaling algorithm, which can compensate the more third orders phase coupling, can arrive an ideal focusing UWB SAR image in the certain of scope. Further more, the algorithm has been used successfully in raw UWB SAR data processing.

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References(1)

References

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