Abstract
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.
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