Avoiding Phase Unwrapping in Baseline Calibration of Spaceborne Bistatic SAR Based on Stereo-Radargrammetry

Baseline calibration is a fundamental procedure in generating DEM with InSAR data. However, conventional calibration algorithms heavily rely on the outcomes of phase unwrapping, which exhibit strong interdependencies with the baseline calibration results. The phase unwrapping process introduces considerations such as integer ambiguity, disparities between transmit and receive path delay, and potential errors stemming from data processing. To circumvent the inherent challenges associated with phase unwrapping errors, this paper proposes a novel calibration approach based on stereo-radargrammetry. The efficacy of the proposed method is affirmed through experimentation conducted on authentic LuTan-1 SAR images.