Abstract
The bistatic synthetic aperture radar (SAR) system, based on an inclined geosynchronous earth orbit (GEO) illuminator and a low-earth-orbit (LEO) receiver, has the advantages of high spatial and temporal resolution, higher signal-to-noise ratio (SNR) and good concealment. In this paper, the new system of bistatic InSAR with one GEO transmitter and two LEO receivers is studied. Firstly, we employ Hill equation to design the formation configuration between two LEO SAR receiving platforms. The vertical baseline can be formed between receivers, yielding GEO-LEO bistatic interferometric SAR (InSAR) system. Secondly, under bistatic InSAR interferometric geometry, the positioning equations of InSAR are established, and the elevation measurement accuracy and plane measurement accuracy are analyzed. The simulation results show that the GEO-LEO bistatic InSAR system has good interference performance and can achieve the meter-level interferometric measurement accuracy.
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