SAR signal reconstruction from non-uniform displaced phase centre sampling
SAR signal reconstruction from non-uniform displaced phase centre sampling
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DOI：
10.1109/igarss.2004.1370674
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
G. Krieger;N. Gebert;A. Moreira
中科院分区：
文献类型：
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作者：
G. Krieger;N. Gebert;A. Moreira
位移相位中心(DPC)技术使宽测绘带SAR具有较高的方位向分辨率。在经典的DPC系统中，必须选择PRF，以使SAR载波在随后的雷达脉冲之间仅移动其天线长度的一半。任何偏离该PRF的情况都会导致合成孔径的采样不均匀。本文表明，在这种非最佳PRF的情况下，对SAR信号的明确重构也是可能的。为此，推导了一种创新的重建算法，该算法能够在合成孔径的非均匀采样的情况下恢复明确的多普勒谱。该算法对于多基地卫星星座以及雷达卫星II和TerraSAR-X中的双接收天线也具有很大的潜力
The displaced phase centre (DPC) technique enables a wide swath SAR with high azimuth resolution. In a classic DPC system, the PRF has to be chosen such that the SAR carrier moves just one half of its antenna length between subsequent radar pulses. Any deviation from this PRF results in a non-uniform sampling of the synthetic aperture. This paper shows that an unambiguous reconstruction of the SAR signal is also possible in case of such a non-optimum PRF. For this, an innovative reconstruction algorithm is derived, which enables a recovery of the unambiguous Doppler spectrum also in case of a non-uniform sampling of the synthetic aperture. This algorithm also has a great potential for multistatic satellite constellations as well as the dual receive antennas in Radarsat II and TerraSAR-X