Ambiguities in Spacebornene Synthetic Aperture Radar Systems
Ambiguities in Spacebornene Synthetic Aperture Radar Systems
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DOI：
10.1109/taes.1983.309319
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发表时间：
1983-05
影响因子：
4.4
通讯作者：
F. Li;W. Johnson
中科院分区：
文献类型：
--
作者：
F. Li;W. Johnson
研究了星载合成孔径雷达（sar）的距离和方位（时延和多普勒）模糊问题。描述了一种精确的方法来评估信号的模糊性强度与信号强度之比。将该方法应用于星载标称SAR系统，讨论了该比值随轨道纬度和姿态控制误差的变化规律。研究还表明，模糊信号的详细距离偏移方位相位历史不同于信号的距离偏移方位相位历史。因此，模糊的图像是分散的。介绍了几个由SEASAT SAR观测到的这种分散图像的例子。当适当调整加工参数时，这些分散就会被消除。最后，描述了一种利用一组多脉冲重复频率来确定高载波频率和相对较差姿态测量的sar的多普勒质心频率绝对值的方法。
Several aspects of range and azimuth (time delay and Doppler) ambiguities in spaceborne synthetic aperture radars (SARs) are examined. An accurate method to evaluate the ratio of the intensities of the ambiguities to that of the signal is described. This method has been applied to the nominal SAR system on SEASAT and the variations of this ratio as a function of orbital latitude and attitude control error are discussed. It is also shown that the detailed range migration-azimuth phase history of an ambiguity is different from that of a signal. The images of ambiguities are, therefore, dispersed. Several examples of such dispersed images observed by the SEASAT SAR are presented. These dispersions are eliminated when the processing parameters are adjusted appropriately. Finally, a method is described which uses a set of multiple pulse repetition frequencies to determine the absolute values of the Doppler centroid frequencies for SARs with high carrier frequencies and relatively poor attitude measurements.