基于北斗卫星速度外推的GEO卫星速度解算方法

GEO Satellites Velocities Algorithm Studies Based on BeiDou Satellites Velocity Extrapolation

关键词:  北斗系统  地球静止轨道  卫星速度  速度外推

Key words:  BDS  GEO  Satellites velocities  Velocity extrapolation

摘要:

北斗二代导航系统是我国自主开发的区域卫星导航系统,该系统利用 GEO卫星实现了区域卫星导航定位。针对 GEO卫星的特点,现有的 GEO卫星速度解算方法分为微分法与差分法两种,这两种方法各有优缺点。为了进一步提高 GEO卫星速度计算的效率与精度,首先对两种计算 GEO速度的计算方法进行了推导,从计算精度、计算量,计算时间和软件实现难易程度对两种方法进行了对比,同时提出了一种利用卫星加速度进行卫星速度外推的方法,仿真结果表明这种方法能够提高接收机的测速精度,且计算量较小,工程实现难度较低。

Abstract:

BeiDou II system(BDS),which is a regional satellites navigation system,is developed independently by our country. In BDS,GEO satellites are used to realize regional satellites navigation. There are two methods for existing receivers to calculate GEO satellites velocities. One sees the difference of two satellites positions that are in adjacent moment as the velocity. The other is the derivative of the positions of GEO satellites formula with respect to time. Both of them have advantages and disadvantages. In order to improve the precision and efficiency of GEO satellites velocities calculating,firstly,this paper derives two formulas of calculating velocities of GEO satellites and compares these two methods in precision,amount and time of calculation and whether it is easy for software to realize. Then,a method that uses the acceleration of GEO satellites to extrapolate velocity of satellites is put forward. The result of simulation indicates that it can improve the precision of receiver velocity determination,what’s more,it has less amount of calculation and is easy to realize.