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| Implementing Wide-swath SAR Based on Displaced Phase Center Azimuth Multi-beam |
| Hu Yu-xin①②;Ding Chi-biao①; Wu Yi-rong① |
| ①The Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China; ②The Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract A wide-swath SAR scheme based on displaced phase center azimuth multibeam is presented in this paper. More than one azimuth sampling can be acquired during one pulse period in the SAR system with azimuth multibeam. Therefore, the pulse repetition frequency can be greatly reduced, which enables wide-swath SAR imaging. As the satellite velocity varies in different part of the orbit and PRF required for each view angle is different, the azimuth sampling is nonuniform in some orbit position. A signal reconstruction algorithm based on multi-channel sampling is proposed to eliminate nonuniform azimuth sampling. Compared with the wide-swath SAR based on high orbit satellite or distributed satellite, the proposed scheme is easier to implement.
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Received: 01 November 2006
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2008, Vol. 30 
