低轨星座/惯导紧组合导航技术研究CSCD

现有低轨(LEO)卫星导航研究主要以低轨星座独立导航定位和增强全球卫星导航系统(GNSS)导航定位为主,对低轨卫星和惯性导航系统(INS)组合导航技术研究较少。本文面向应用较小规模低轨星座资源实现米级定位精度的需求,提出了一种低轨星座/惯导紧组合导航方法,系统性地分析了不同规模低轨星座、不同精度级别惯导器件以及不同导航信号播发频度下组合导航定位的性能,并利用构建的仿真试验系统进行了低轨星座/惯导紧组合导航方法的仿真试验验证。试验结果表明,相较于低轨星座独立导航,低轨星座/惯导紧组合导航在星座不满足四重覆盖时仍能达到米级定位精度,并且在低轨星座规模较小和导航信号播发频度较低时,惯导测量精度对组合导航定位精度影响明显。研究结果表明,在利用低轨卫星进行导航时,通过引入惯性观测辅助低轨卫星导航,可有效提高导航效能和精度,为低轨星座和导航信号播发方式设计带来更多的选择。

Research of LEO Constellation/INS Tight Integrated Navigation

Nowadays, the research of LEO satellite navigation fouces on independent navigaiton and enhancing GNSS navigation by LEO constellations, but LEO constellation/INS integrated navigation is lack of research.Aiming at meter-level positioning precision with small-scale LEO constellations, the method of LEO constellations/INS tight integrated navigation is proposed. The performance of LEO constellation/INS integrated navigation with different number of LEO satellites, different precision of INS and different broadcasting frequency of LEO satellite navigation signals is analysed systematically, and the ability of LEO constellation/INS tight integrated navigation is verified by the simulation system developed. The results show, compared with LEO constellations independent navigaiton, the positioning precision of LEO constellation/INS integrated navigation can reach meter level even when LEO constellations do not meet quadruple coverage. Moreover, when the scale of LEO constellations is small and the navigation signal broadcasting frequency is low, the precision of inertial navigation affects the performance of LEO constellation/INS integrated navigation positioning significantly. The research demonstrates that the introduc-tion of inertial observations assisting LEO satellites navigation can effectively improve the navigation efficiency and precision and bring more choices for the design of LEO constellation and navigation signal broadcasting mode.