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导航卫星星地/星间链路联合定轨中设备时延的方法

阮仁桂1,冯来平贾小林1   

  • 收稿日期:2013-01-17 修回日期:2013-12-02 出版日期:2014-02-20 发布日期:2013-12-19
  • 通讯作者: 阮仁桂

Motheds of Equipement Delay Estimation Using Pseudorange, Carrier Phase and Inter-Satellite Ranging Observations

  • Received:2013-01-17 Revised:2013-12-02 Online:2014-02-20 Published:2013-12-19

摘要:

导航卫星系统播发的卫星钟差改正数包含了卫星的导航信号设备群时延。从保持与用户算法一致性的角度考虑,指出利用星间测距数据求解的卫星钟差也应该包含导航信号设备群时延。由此发现星间链路设备时延以组合时延的形式出现在观测方程中:接收设备时延与导航信号群时延之和构成组合接收时延,发射设备时延与导航信号群时延之差构成组合发射时延。探讨了处理星间链路设备时延的方法,提出两种在定轨和钟差解算数据处理的同时估计设备时延参数的方法:一是估计每颗卫星的组合接收时延和组合发射时延;二是估计每条(有向)链路的时延偏差参数(组合接收时延与组合发射时延之和)。通过仿真实验,证明了所提方法正确性和有效性。结果表明,利用提出的方法可以显著地降低设备时延对轨道和钟差解算精度的影响,效果几乎接近设备时延被准确标定的理想情况。

关键词: 星间伪距, 设备时延, 组合时延, 精密定轨, 钟差解算

Abstract:

Navigation signal equipment group delay is assimilated into satellite clock corrections broadcasted in the navigation message. Considering the necessity to keep consistent with GNSS user algorithms for positioning and timing, it’s pointed out that the satellite clock offsets solved with inter-satellite ranging observations should also include the group delay of navigation payload onboard GNSS satellites. It was found that equipment delays of crosslink devices appear in observation equation in the form of combination with the group delay of navigation payloads: the sum of receiving equipment delay and the group delay forms combined receiving delay, while transmitting equipment delay subtracting the group delay forms combined transmitting delay. We made many efforts to discuss the method for dealing with the problem of equipment delay and two approaches were proposed: one is to estimate the combined transmitting and receiving delay parameters for each satellite, another is to estimate the delay bias (the sum of combined transmitting delay and combined receiving delay) parameters for each pair of directed linked satellites. Software for simulation and data processing has been developed and the feasibility of the proposed method and data processing strategy were validated by simulation analysis. The result indicates that. by implementation of both the two proposed approach, the accuracy of orbit and clock result would be significantly improved and the effect is nearly the same as if the combined delays have been exactly corrected.

Key words: Inter-satellite pseudorange, Equipment delay, Combined Equipment delay, Orbit determination, Clock solution

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