Baseline designing and implementation approach for a Geo-SAR tomography system

摘要

This study proposes a new method to design and implement the baseline of a geosynchronous Earth orbit synthetic aperture radar (Geo-SAR) tomography system. Due to the satellite's orbital property, its ideal revisit cycle is 1 day, and it could be changed through raising or lowering the orbital height. As a result, the local ascending node longitude would move because of the orbital shifting, and all the passes' trajectories are nearly parallel. A baseline designing and implementation approach is advanced according to this characteristic. The cell array configuration and baseline length are illustrated by considering the demand of cross-range resolution and ambiguity. This study analyses and simulates the Geo-SAR tomography system baseline properties. Furthermore, a series of parallel trajectories are implemented by controlling orbital altitude as demanding during each cycle. A simulation experiment is performed to verify the efficiency and superiority of this approach, and the results show that it has a good effect on an L-band mode Geo-SAR tomography system with three-dimensional resolution ∼10 m.