SAR signal reconstruction from non-uniform displaced phase centre sampling in the presence of perturbations
SAR signal reconstruction from non-uniform displaced phase centre sampling in the presence of perturbations
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DOI：
10.1109/igarss.2005.1525291
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发表时间：
2005-07
期刊：
影响因子：
--
通讯作者：
N. Gebert;G. Krieger;A. Moreira
中科院分区：
文献类型：
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作者：
N. Gebert;G. Krieger;A. Moreira
位移相位中心 (DPC) 技术可实现具有高方位角分辨率的宽测绘带 SAR。在经典的 DPC 系统中，脉冲重复频率 (PRF)、传感器速度和天线长度构成严格的定时要求，任何偏差都将导致合成孔径的不均匀采样。这种限制可以通过使用重建算法来克服，该算法在非均匀采样的情况下也能够恢复明确的多普勒频谱。本文解释了处理所施加的重构的局限性以及对歧义抑制的影响。该算法在应用于像 TerraSAR-X 这样具有分离式接收天线的 DPC 系统时的潜力得到了证明，并指出了额外的接收孔径在测绘带宽度和分辨率方面带来的好处。此外，还显示了加性噪声和相位噪声对重建的影响及其对这些扰动的敏感性。
The displaced phase centre (DPC) technique enables a wide swath SAR with high azimuth resolution. In classic DPC systems, the pulse repetition frequency (PRF), sensor velocity and antenna length underlie a stringent timing requirement and any deviation will result in a non-uniform sampling of the synthetic aperture. This restriction can be overcome by the use of a reconstruction algorithm, which enables a recovery of the unambiguous Doppler spectrum also in case of a non-uniform sampling. This paper explains limitations of the reconstruction imposed by the processing and the impacts on the ambiguity suppression. The potential of the algorithm when applied to DPC systems like TerraSAR-X with its split receive antenna is demonstrated and the benefits resulting from the additional receive apertur e regarding swath width and resolution are pointed out. Further on, the impact of additive and phase noise on the reconstruction and its sensitivity against these perturbations are shown.