【摘要】 针对北斗Ⅱ卫星导航星座中卫星位置不确定问题,改进并完善了正在筹建中的北斗Ⅱ卫星导航星座布局,在此基础上仿真分析了我国区域性导航系统以及北斗Ⅱ卫星导航星座的多星覆盖、位置精度衰减因子(position dilution of preci-sion,PDOP),给出了覆盖性能、导航定位精度等导航星座系统性能。仿真结果表明,北斗Ⅱ卫星导航系统多星覆盖及PDOP性能相对优于GPS导航星座,尤其适用于我国及周边地区。通过对不同最低仰角下北斗II导航星座及GPS星座多星覆盖变化分析,确定了各星座多星覆盖与仰角的关系以及变化特征,为北斗II导航系统组建工作以及应用终端设计提供了依据。更多还原

【Abstract】 To solve the ambiguity of satellite position in BeiDou Ⅱ satellite navigation system,the layout of the on-going construction of BeiDou Ⅱ Constellation is improved and consummated.For the regional navigation system and BeiDou Ⅱ satellite navigation system,experiment indicates the performance of coverage and navigation precision.Simulation results show that,BeiDou Ⅱ can meet the demand of a good navigation system,and it performs better than GPS navigation system,especially over china and areas around our country.At last,the results of the coverage performance at different minimum elevation is analyzed and simulated,thus characteristic of the result and the relationship between minimum elevation and the number of visible satellite in the constellation is determined,and then some principles for the application design of BeiDou Ⅱ satellite navigation system are highlighted.更多还原