Unambiguous SAR Signal Reconstruction From Nonuniform Displaced Phase Center Sampling
Unambiguous SAR Signal Reconstruction From Nonuniform Displaced Phase Center Sampling
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DOI：
10.1109/lgrs.2004.832700
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发表时间：
2004-10-01
影响因子：
4.8
通讯作者：
Moreira, Alberto
中科院分区：
文献类型：
--
作者：
Krieger, Gerhard;Gebert, Nicolas;Moreira, Alberto
位移相位中心技术将使宽波段合成孔径雷达（SAR）具有高方位分辨率。在经典的DPC系统中，必须选择脉冲重复频率（PRF），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PRF的情况都会导致合成孔径采样不均匀。本文提出了一种创新的重建算法，并表明对于合成孔径的非均匀采样，SAR信号的无二义重建是可能的。该算法在多静态卫星星座以及Radarsat 2和TerraSAR-X的双接收天线模式下也具有很大的潜力。
The displaced phase center (DPC) technique will enable a wide-swath synthetic aperture radar (SAR) with high azimuth resolution. In a classic DPC system, the pulse repetition frequency (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 will result in a nonuniform sampling of the synthetic aperture. This letter derives an innovative reconstruction algorithm and shows that an unambiguous reconstruction of a SAR signal is possible for nonuniform sampling of the synthetic aperture. This algorithm will also have great potential for multistatic satellite constellations as well as the dual receive antenna mode in Radarsat 2 and TerraSAR-X.