高低卫卫跟踪模式恢复地球重力场的误差分析

基于高低卫卫跟踪的模式用积分方法分别研究轨道误差和加速度计误差对于重力场模型位系数的影响,模拟结果表明,轨道误差对于重力位系数的影响很大,5 cm精度的轨道数据至多能恢复40阶的重力位模型;加速度计的随机误差对于重力位系数的影响相对轨道误差要小得多,即使是10-7m/s2的加速度计误差引起的位系数误差比3 cm的轨道误差引起的位系数误差要小得多,加速度计的系统误差对于重力位系数的影响很大,但是采用估计的方法可以很好地削弱该项的影响。

Error Analyses for Recovery of the Earth's Gravity Field by HL-SST Technique

The earth's gravity field can be recovery by HL-SST(High Low Satellite to Satellite Tracking) technique.The effects to potential coefficients from the orbital error and accelerometer's error respectively are analyzed by integral technique.The results indicate that the potential coefficients error induced by orbital error is great,thus at most 40 degree coefficients can be recovered by use of orbital data with accuracy of 5 cm.While the effect from the accelerometer random error is smaller than the one from orbit error,even the potential coefficients error induced by 10~(-7)m/s~2 accelerometer random error being smaller than the one caused by 3 cm orbital error.The effect of the accelerometer systematic error is serious,but if it is be evaluated with potential coefficients,the effect is reduced.