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Inverse Synthetic Aperture Ladar Imaging Algorithm for Maneuvering Target Based on FRFT-CLEAN |
Ruan Hang Wu Yan-hong Ye Wei |
The Academy of Equipment, Beijing 101416, China |
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Abstract When imaging maneuvering target with Inverse Synthetic Aperture Ladar (ISAL), dispersion and Doppler frequency time-variation exist in the echo signal in range and cross-range direction, respectively. For targets of which the maneuverability can be approximated as a second-order motion, the characteristics of the ISAL echo signal are analyzed, and an imaging algorithm based on FRactional Fourier Tronsform(FRFT-CLEAN) is proposed. FRFT is used for range dispersion elimination. After motion compensation, a method combining FRFT and CLEAN technique (FRFT-CLEAN) is proposed for azimuth imaging. Simulation results demonstrate the validity of this algorithm.
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Received: 08 November 2012
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Corresponding Authors:
Ruan Hang
E-mail: dragonruan@zju.edu.cn
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