BDS-3/GNSS非组合精密单点定位

BDS-3/GNSS Uncombined Precise Point Positioning

北斗三号卫星导航系统(BeiDou-3 navigation satellite system,BDS-3)全球组网工作全面建成,标志着BDS-3迈入全球定位、导航和授时服务的新时代。为了全面比较BDS-3系统与其余全球导航卫星系统(global navigation satellite system,GNSS)非组合精密单点定位(precise point positioning,PPP)性能,重点分析不同分析中心BDS-3精密轨道和钟差产品的一致性、BDS-3/GNSS卫星可用性、BDS-3/GNSS单系统及多系统融合PPP定位性能。结果表明,基于5个分析中心的精密轨道和钟差产品,BDS-3静态PPP三维均方根误差约为2.31~4.00 cm,其单系统收敛时间明显慢于其余GNSS系统,GPS系统的加入对BDS-3/GNSS双系统融合PPP改善效果最为明显,且四系统融合能够有效地缩短收敛时间,并提高动态PPP定位精度。随着BDS-3系统的发展以及轨道和钟差产品的进一步完善,BDS-3同样具备其余GNSS系统提供优质导航定位服务的潜力。

Objectives:The global constellation network of BeiDou-3 navigation satellite system(BDS-3)has been completed,which means that BDS-3 has entered a new era of providing high-quality positioning,navigation and timing service for global users.Methods:To comprehensively compare the performance of BDS-3 uncombined precise point positioning(PPP)with other global navigation satellite systems(GNSS),this paper focuses on three aspects,including the consistency of BDS-3 precise orbit and clock products among different analysis centers,the satellite availability of BDS-3/GNSS,the positioning performance of BDS-3/GNSS single-system and multi-system PPP.Results:Based on the precise orbit and clock products from five analysis centers,the three-dimensional root mean square error of BDS-3 static PPP is between 2.31 cm and 4.00 cm,and its convergence time is significantly slower than that of other GNSS.The introduction of GPS observations can achieve the most obvious improvement among BDS-3/GNSS dual-system joint PPP.Besides,the quad-constellation observations can effectively shorten the convergence time of PPP and improve the positioning accuracy on kinematic mode.Conclusions:With the development of BDS-3 and the improvement of its orbit and clock products,BDS-3 has a great potential to provide highquality positioning services as other GNSS.