北斗导航卫星系统测距信号的精度分析

基于单测站和短基线实验的伪距相位差值 (Code-minus-phase Combination, CC)和多路径(Multipath, MP)两类组合观测值，对比分析了北斗（BD）和GPS测距信号质量，并检验了多路径误差对CC模糊度固定的影响。结果表明：BD GEO卫星(Geostationary Earth Orbit)的测距信号质量优于IGSO卫星(Inclined Geosynchronous Satellite Orbit)，且两类测距信号的多路径误差分别包含长、短期的变化趋势。针对CC模糊度固定，当采用较长时间段（如本文中的600s）时，GPS L1/L2和BD B1/B2四个频段上的成功率均超90%；而对于快速模糊度固定（如仅采用120秒），由于受强多路径误差影响，BD IGSO卫星的固定成功率最低，不超过50%。

Precision Analysis of BeiDou Range Measurement Signals

A Code-minus-phase Combination (CC) and Multipath (MP) GPS and BeiDou (BD) measurements analysis approach is demonstrated, and the qualitative results of single frequency GPS and BD measurement signals are presented; the performances of CC ambiguity resolution with single frequency data is discussed lastly. The results show that: measurement signals of Geostationary Earth Orbit (GEO) satellite show a higher precision than Inclined Geosynchronous Satellite Orbit (IGSO) satellite; the multipath effects of two kinds of measurement signals behave in long-term and short-term trend. When a long period is utilized, such as 600s, the success rate of CC ambiguity resolution can reach over 90% in GPS L1/L2 and BD B1/B2 frequency, however, when short period is utilized, such as 120s, owing to the stronger multipath effects, the success rate of BD IGSO satellite is the lowest, no more than 50%.