Burst-mode SARs for wide-swath surveys
Burst-mode SARs for wide-swath surveys
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DOI：
10.5589/m07-008
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发表时间：
2007-01
影响因子：
2.6
通讯作者：
D. D'Aria;F. Zan;D. Giudici;A. M. Guarnieri;F. Rocca
中科院分区：
文献类型：
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作者：
D. D'Aria;F. Zan;D. Giudici;A. M. Guarnieri;F. Rocca
提出了一种重访时间短（12天）、面向全球监测的星载合成孔径雷达。由于距离覆盖和方位天线长度之间的已知关系，这种系统在传统的带状图模式下是不可行的，但可以在突发模式sar中实现，如ScanSAR和TOPSAR。我们详细介绍了ScanSAR和TOPSAR传感器的设计，提供了一种优化TOPSAR突发长度的方案，并讨论了一种称为TOPSPOT的创新突发模式方案。从扇贝效应、噪声等效西格玛零（NESZ）和模糊性三个方面分析了三种方案的性能，并通过假设椭球地球上的点目标的模拟结果进行了验证。
A spaceborne synthetic aperture radar (SAR) aimed at global monitoring with a short revisit time (12 days) is proposed. Such a system is not feasible in a conventional Stripmap mode because of the known relation between range coverage and azimuth antenna length, but it can be achieved in burst-mode SARs, like ScanSAR and TOPSAR. We detail the design of ScanSAR and TOPSAR sensors, provide a scheme to optimize the burst length in TOPSAR, and discuss an innovative burst-mode scheme defined as TOPSPOT. The performances of the three schemes are analyzed in terms of scalloping, noise-equivalent sigma zero (NESZ), and ambiguities and are validated with simulated results achieved by assuming point targets on the ellipsoidal earth.