Abstract:

The orbit determination accuracy requirements for geosyn-chronous synthetic aperture radar(GEOSAR) are analyzed according to the technical features and application requirements. Firstly, an orbit determination error model is developed and the effects on the slant range and Doppler parameters are qualitatively analyzed. Then, considering that it is difficult to solve the whole error formula, a method to analyze orbit determination accuracy is proposed based on the Monte Carlo test method, the analysis processes of the typical application modes for GEOSAR are also carried out. Finally, focused on the middle inclined GEOSAR, the orbit determination accuracy requirements are given. Simulation results verify that the accuracy of the radial position should be at meter-level and the tangential velocity at 10^-3m/s level for GEOSAR imaging, the tangential position should be at 10 meter-level and the radial velocity at 10^-3 m/s level for GEOSAR target positioning, and the radial position should be at millimeter level for GEOSAR differential interferometry, and the smaller down angle is, the higher constrains are.