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| A New GMTI Method Based on Chirp-Z Transform for Distributed Satellites Interferometric SAR |
| Zhao Ying-hui①②;Wang Yan-fei① |
①Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China;
②Graduate University of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract Distributed satellites interferometric SAR is capable of detecting ground moving targets via along-track baseline. In this paper, the signal model and phase compensation for this INSAR system is analyzed firstly. A new method based on Chirp-Z transform for GMTI in range-Doppler domain is proposed. The received data of different channels can be co-registered precisely along azimuth direction after being transformed into Doppler domain via CZT, and moving target can be detected through interferometry procedure combined with spectrum phase compensation. In the end, the constraints of multistatic SAR configuration by spectrum phase compensation and target motion by spectrum co-registration are discussed. The final simulation demonstrates that this algorithm can detect moving target efficiently.
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Received: 30 October 2006
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2008, Vol. 30 
