摘要
本文从卫星与地面目标之间的空间几何关系出发推导了多普勒参数(多普勒中心频率和多普勒调频率)与卫星轨道参数和姿态参数的关系式,并与从雷达信号中提取的参数值进行了比较;分析了各参数误差的灵敏度;提出了卫星姿态角误差分配原理。最后分析了由已知的多普勒中心频率反算姿态参数的可行性。
The formulation of Doppler parameters (Doppler centroid and Doppler frequency rate) from the geometry of satellite-borne SAR is derived. After analysing the error sensitivity of SAR orbit and attitude parameters, the error allocation principle for satellite attitude parameters is presented. Finally, the feasibility to calculate the satellite attitude from the Doppler centroid extracted from SAR raw data is proved.
关键词
卫星恣态
星载雷达
合成孔径雷达
Spaceborne SAR system
Parameter estimation
Satellite attitude parameter
