卫星总体参数对SAR多普勒参数影响分析及仿真研究

该文从星载合成孔径雷达(SAR)空间几何关系出发，建立了星载SAR多普勒参数的表达式。在考虑地球自转和扁率的情况下，分析了轨道摄动、卫星姿态指向误差和稳定度对SAR多普勒参数的影响，并进行了数字仿真。分析仿真结果表明轨道摄动是造成星载SAR多普勒参数误差的主要因素；姿态稳定度的提高在减小多普勒参数误差变化频率的同时可以使误差量降低。该文的研究结果对于分析总体参数对图像质量的影响和卫星总体参数的确定和设计优化具有参考价值。

Analysis and Simulation of Satellite System Parameter Effect on SAR Doppler Parameters

On the basis of the space geometry relation of spaceborne Synthetic Aperture Radar(SAR), its Doppler parameters formulation is built in this paper. Taking the earth rotation and oblateness into consideration, the orbit perturbation, attitude errors and its stability effects on SAR Doppler parameters are analyzed.The simulation result shows that orbit disturbance is the key factor to Doppler error, and the enhancement of attitude stabilization can lead to the decline of Doppler error as well as its variability. The conclusion is valuable for the determination and optimization of the system parameters.