Abstract
This paper presents a new approach to calculate the 1{ 4th order Doppler parameters for Geosynchronous Synthetic Aperture Radar (Geo-SAR). To get accurate calculation results, the Earth is modeled as an ellipsoid and the relative motion between the sensor in an elliptical orbit and the rotating Earth is analyzed. The J2, J3 and J4 orbital perturbation items and attitude steering are analyzed. Ignoring the perturbation force would produce errors of the Doppler parameters for spaceborne SAR because it can in∞uence the six orbital elements. Since the Doppler parameters are related to the antenna beam pointing directions and in∞uenced by attitude of SAR platform, the calculation results before and after attitude steering are shown. Furthermore, the Doppler parameter properties during the whole orbital periods of Geo- SAR are compared with those of Low-Earth-Orbital SAR (Leo-SAR). Finally, the efiects on Doppler parameters stemmed from the radar beam pointing accuracy are analyzed.
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