Equipment Delay Estimation for GNSS Satellite Combined Orbit Determination with Satellite-ground Link and Inter-Satellite Link Observations
Equipment Delay Estimation for GNSS Satellite Combined Orbit Determination with Satellite-ground Link and Inter-Satellite Link Observations
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发表时间：
2014
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通讯作者：
Ruan Rengu
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作者：
Ruan Rengu
星间测距信号和导航信号的设备时延差异会影响星间测距数据和地面监测站观测求解的定轨和时钟解算结果。为了与GNSS用户定位授时算法保持一致，指出星间测距观测求解的卫星时钟偏差还应包括GNSS卫星上导航有效载荷的群时延(GD)，并推导了观测方程提出了两种数据处理方法：一是对每颗卫星的时延校正参数进行估计；二是对每条（定向）链路的时延校正参数进行估计。开发了仿真和数据处理软件，通过仿真分析验证了所提出的方法和数据处理策略的可行性。结果表明，应用这两种方法中的任何一种，轨道和时钟结果的精度都可以提高。显着改善，其效果几乎与设备延迟得到精确纠正一样。
The difference between equipment delays of inter-satellite ranging signal and navigation signal would consequentially impact on the result of orbit determination and clock solution solved with inter-satellite ranging data and observations from ground-based monitoring stations.In order to keep consistent with GNSS user algorithms for positioning and timing,it's pointed out that the satellite clock bias solved with inter-satellite ranging observations should also include the group delay(GD)of navigation payload onboard GNSS satellites,and the observation equations are derived for combined orbit determination.The method for dealing with the problem of equipment delay is discussed.It is pointed that equipment delays should be estimated via data processing.Two approaches for data processing are proposed:one is to estimate the delay correction parameters for each satellite;another is to estimate the delay correction parameters for each(directional-)link.Software for simulation and data processing has been developed and the feasibility of the proposed method and data processing strategy are validated by simulation analysis.The results indicate that,by applying anyone of the two proposed approaches,the accuracy of orbit and clock result could be significantly improved and the effect is nearly the same as if the equipment delays have been exactly corrected.