小偏心率低轨卫星的星历参数拟合法

研究了小偏心率低轨卫星参数拟合理论，数据来源于某星载GPS接收机定位数据。通过对小偏心率近地卫星的轨道根数进行频谱分析，建立了对应的数学模型，用采样数据对数学模型中的参数用最小二乘法进行估计。对算法进行了模拟仿真，结果表明，该方法简单有效，计算速度快，拟合和短时间（10min）预报误差在100m量级。

Ephemeris Parameters Fitting Method for Low Eccentricity LEO Satellite

The research is engaged in the theory of ephemeris parameters fitting to low earth orbit （LEO） of low eccentricity. The data come from positioning results of an onboard GPS receiver. Spectrums of orbit elements of low eccentricity LEO satellite are analyzed, and then corresponding math models are constructed in which the parameters are estimated with least-squares procedure using sampling data. Simulation of algorithm shows that this method is simple, efficient and quickly computed, with a 100-metre magnitude of fitting and short-term （10 min） prediction error.