利用外部辅助信息解决双星定向中的模糊度确定问题

由于我国双星系统载波相位信息少,且对地静止,难以直接利用多星系统(GPS、GLONASS等)解模糊方法进行双星定向。针对此种情况,本文提出了一种基于外部辅助信息的模糊度函数方法来确定单差模糊度参数初值,并详细分析了外部辅助信息的精度要求。进行了仿真实验,结果表明:当基线长度为2米,原始载波相位测量精度为1%周时,只需外部姿态传感器提供精度不低于1 70°的辅助方向信息,即可以约98 60%的高成功率正确确定模糊度参数。该项技术可辅助惯导系统实现快速初始对准。此外,采用多天线配置,利用INS提供概略姿态信息可实现双星实时定姿,并可进一步发展为双星/INS组合导航系统,从而极大地扩展应用领域。

Ambiguity resolution of the twin-star system orientation determination using aided information

Due to little phase information and geostationary character of our country's Twin-Star satellite system,it's difficult to apply the common AR methods used within multi-satellite system such as GPS and GLONASS.This paper has developed an ambiguity function method based on aided information ,the precision needed also thoroughly analysed.Simulation performed,the results indicated that:with 2 meter long baseline,1 percent non-difference phase measurement precision,the ambiguity parameters can be identified by about a success ratio of 98.60 percent,as long as the aided orientation information precision can reach 1.70 degree.This technology may help INS to realize fast initial alignment.Furthermore,using multi-antenna configuration aided by INS,can lead to the real time Twin-Star attitude determination system,and Twin-Star/INS hybrid navigation system,which will widen its application fields largely.