基于“北斗”三号PPP-B2b的定位与时间传递

随着“北斗”三号的建成以及通过GEO卫星进行播发的PPP-B2b信号的公布，“北斗”卫星的定位与定时精度再一次得到提升。为了研究PPP-B2b的定位精度以及时间传递性能，开展了对“北斗”三号的PPP-B2b相关实验。首先选取亚太地区的6个测站静态与动态精密单点定位E(East)、N(North)、U(Up)方向上的误差分析，然后又选取了NTSC与USUD测站进行时间传递稳定度分析。定位结果表明，B1I/B3I组合与B1C/B2a组合的PPP-B2b静态定位E方向、N方向、U方向RMS值分别在4.58 cm, 5.34 cm, 2.2 cm与4.18 cm, 4.97 cm, 2.22 cm, B1I/B3I组合与B1C/B2a组合的PPP-B2b动态定位E方向、N方向、U方向RMS值分别在17.99 cm, 19.41 cm, 12.72 cm与22.47 cm, 21.61 cm, 15.11 cm,两种组合表现出定位精度的一致性。PPP-B2b零基线共钟的时间传递普遍在1 ns内波动，时间传递的STD为0.203,10⁵ s的稳定度达到了5.336×10

Positioning and Time Transfer Based on BDS-3 PPP-B2b

With the completion of BDS-3 and the announcement of the PPP-B2b signal broadcast through geostationary Earth orbit(GEO) satellites,the positioning and timing accuracy of Beidou satellites has once again been improved.In order to study the positioning accuracy and time transfer performance of PPP-B2B,the authors carry out PPP B2b related experiments on BDS-3.In experiments,six stations in the Asia-Pacific region are selected for static and dynamic precision single point positioning research,and then NTSC and USUD stations are selected for time transfer research.The positioning results show that the root mean square(RMS) values in East(E) direction,North(N) direction and Up(U) direction of PP-B2B static positioning of B1I/B3I combination and B1C/B2a combination are 4.58 cm,5.34 2.2cm and 4.18 cm,4.97 cm,2.22 cm,respectively.The RMS values of the B1I/B3I and B1C/B2a PP-B2B dynamic positioning in E direction,N direction and U direction are 17.99 cm,19.41 cm,12.72 cm and 22.47 cm,21.61 cm,15.11 cm,respectively.The two combinations show the consistency of positioning accuracy.The time transfer of PPP-B2B zero-base line common clock generally fluctuates within 1 ns,the STD of time transfer is 0.203,and the stability of 100 000 seconds reaches 5.336×10-15.The time transfer of PPP-B2b long baseline generally fluctuates within 5 ns,the time transfer STD is 1.585,and the time transfer STD reaches 3.55×10-14 in 10 000 seconds.Therefore,B2b products can meet the requirements of centimeter-level positioning and nanosecond timing in the Asia-Pacific region.