Signal properties of spaceborne squint-mode SAR
Signal properties of spaceborne squint-mode SAR
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DOI：
10.1109/36.581976
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发表时间：
1997-05-01
影响因子：
8.2
通讯作者：
Cumming, I
中科院分区：
文献类型：
--
作者：
Davidson, GW;Cumming, I
本文研究了星载条带合成孔径雷达在极大斜视情况下的信号特性。根据平台姿态和仰角推导出了多普勒质心、方位带宽和曝光时间，描述了多普勒质心随距离和地形高度的变化，解释了大斜视情况下方位带宽可能的距离依赖关系，推导了减小多普勒质心和方位带宽变化所需的偏航和俯仰，并给出了存在天线指向误差时的剩余多普勒质心变化。在大斜视情况下，重新讨论了合成孔径雷达对测绘带宽度和方位带宽之间关系的约束，并用它给出了斜视角度的基本限制。最后，讨论了由大斜视的二维(2-D)谱形状引起的处理注意事项。
This paper presents signal properties of spaceborne, strip-map SAR for very large squint angles. Doppler centroid, azimuth bandwidth, and exposure time are derived in terms of the platform attitude and elevation angle, This allows a description of the Doppler centroid variation with range and terrain height, and explains a possible range dependence of azimuth bandwidth at high squint, The yaw and pitch required to minimize Doppler centroid and azimuth bandwidth variation are derived, and residual Doppler centroid variation in the presence of antenna pointing errors is presented. The SAR constraint on the relationship between swath width and azimuth bandwidth is revisited for high squint, and is used to present a fundamental limit on squint angle. Finally, processing considerations arising from the shape of the two-dimensional (2-D) spectrum with high squint are discussed.