GEO导航星广播星历拟合改进算法设计

设计了倾角较小的GEO导航星的广播星历拟合算法。该方法的核心思想是在常规拟合算法的基础上对位置观测量进行合理的坐标系参考平面旋转,特别是提出针对拟合迭代初值进行相应的坐标变换,从而既可以解决轨道参数拟合的相关性问题,使轨道参数拟合快速收敛,同时又兼顾了用户接收机的计算简便化。通过仿真验证,该方法简洁有效,拟合中误差RMS在厘米量级,能够保证拟合精度。

An Improved Fitting Algorithm Design of Broadcast Ephemeris for GEO Satellite

An improved fitting algorithm of Broadcast Ephemeris for GEO satellite with near-zero-inclination is introduced in the paper.The main idea of the algorithm requires the appropriate rotation of the coordinate reference plane to the position observations based on the general algorithm.Within the algorithm,in particularly,the corresponding coordinate transformation to the fitting initial value is proposed.According to the method,fitting problem in the correlation of orbital parameters can be resolved,and the convergence of iterations is quickly achieved.Meanwhile,the computation for the user receiver is simplified.The simulation results show that the Root-Mean-Square error reaches centimeter level and the fitting accuracy can be guaranteed,indicating the effectiveness of the method.