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| Research on the Method of Moving Target Detection and Location with Three-Frequency Three-Aperture Along-Track Spaceborne SAR |
| Yin Jian-feng①②③; Li Dao-jing①②; Wu Yi-rong①② |
| ①National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China; ②Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; ③Graduate University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract In the case of clutter, conventional multi-channel SAR (Synthetic Aperture Radar) executes moving target detection immediately after clutter cancellation, and the influence of range migration is ignored. However, this approach may lose some fast target. The target that not so fast can be detected, but the estimated velocity may be ambiguous, and target accurate location becomes even difficult. So three-frequency three-aperture SAR is presented in this paper to remove the Doppler ambiguity of fast target after clutter suppression. Dual Frequency Conjugated Processing (DFCP) and Keystone transform are employed to remove the Doppler ambiguity and correct range migration of moving target. Thus the Signal Noise Ratio (SNR) can be improved, and then target detection, velocity estimation and location without ambiguity can be completed. The proposed method can achieve the same location accuracy with the existing method as well as increase greatly the velocity range of fast target that can be detected and located. The simulation results show the effectiveness of proposed method.
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Received: 02 April 2009
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Corresponding Authors:
Yin Jian-feng
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2010, Vol. 32 
