BDS-3新频点信号双频精密单点定位精度分析

Accuracy Analysis of Dual-frequency Precise Single-point Positioning of BDS-3 New Signals

北斗卫星导航系统(BeiDou navigation satellite System,BDS)已于2020年7月正式建成并开通,北斗三号(BDS-3)在旧信号B1I和B3I的基础上,增加了B1C、B2a新信号.为了全面评估BDS-3的新信号B1C、B2a的定位性能,试验了GPS (Global Positioning System)、BDS-3、BDS-2/BDS-3新旧信号的定位性能和BDS系统不同频点与GPS组合定位性能,对BDS (B1I+B3I、B1C/B2a)+GPS (L1+L2)组合静态PPP (Precise Point Positioning)定位性能进行分析,并与单卫星系统对比分析.试验结果表明:BDS-3 (B1C/B2a)在East (E)、North (N)、Up (U)方向的定位精度优于1.25 cm、0.89 cm、1.67 cm,BDS-3新旧频点在E、N方向上定位精度与GPS L1/L2在同一水平上,U方向上新频点定位精度高于GPS L1/L2和BDS-3旧频点,较旧频点定位精度提升了34.2%,新频点收敛时间25.9 min比旧频点提升了12.7%;相较于BDS、GPS单系统,组合系统BDS/GPS定位精度和收敛时间有了明显的提高,BDS-3 (B1C/B2a)+GPS在E、N方向上与BDS-3 (B1I/B3I)+GPS定位精度相当,在U方向上定位精度前者较后者有了明显的提升,提升了17.2%,组合系统新频点收敛时间20.1 min比旧频点提升了17.6%.

BeiDou navigation satellite system(BDS)has been officially built and opened in July 2020.BDS-3 adds new signals B1C and B2a on the basis of old signals B1I and B3I.In order to comprehensively evaluate the positioning performance of new signals B1C and B2a of BDS-3,the positioning performance of GPS(Global Positioning System),BDS-3,BDS-2/BDS-3 old and new signals and the positioning performance of BDS combined with GPS at different frequency points are tested.The positioning performance of BDS(B1I+B3I,B1C/B2a)+GPS(L1+L2)combined static PPP(Precise Point Positioning)is analyzed and compared with that of single satellite system.The experimental results show the positioning accuracy of BDS-3(B1C/B2a)in E(East),N(North),U(Up)direction is better than 1.25cm,0.89cm,1.67cm,respectively.The positioning accuracy of BDS-3 new and old frequency points in E and N directions is the same as that of GPS L1/L2,and the positioning accuracy of new frequency points in U direction is higher than that of GPS L1/L2 and BDS-3 old frequency points,which is 34.2%higher than that of old frequency points.The convergence time of the new frequency point is 25.9min,which is 12.7%higher than that of the old frequency point.Compared with BDS and GPS single systems,BDS/GPS positioning accuracy and convergence time of the combined system have been significantly improved.BDS-3(B1C/B2a)+GPS has the same positioning accuracy as BDS-3(B1I/B3I)+GPS in E and N directions.In the U direction,the positioning accuracy of the former is significantly improved compared with the latter,which is increased by 17.2%.The convergence time of the new frequency point of the combined system is 20.1min,which is 17.6%higher than that of the old frequency point.