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Assessment of BDS-3 global positioning service: ephemeris, SPP, PPP, RTK, and new signal
GPS Solutions ( IF 4.9 ) Pub Date : 2020-06-14 , DOI: 10.1007/s10291-020-00995-y
Junbo Shi , Chenhao Ouyang , Yongshuai Huang , Wenjie Peng

The BDS-3 preliminary system was declared functional on December 27, 2018. It enables positioning service on a global scale. This study conducts a comprehensive investigation of the BDS-3 global service from the perspective of positioning, including satellite ephemeris, benefits of the new BDS-3 satellites, and the new signal effect on three positioning modes: single-point positioning (SPP), precise-point positioning (PPP) and real-time kinematic (RTK). First, the broadcast and precise ephemeris availabilities of 18 BDS-3 Medium Earth orbit (MEO) satellites from January to June 2019 are investigated. Due to the shorter operational timespans of BDS-3 satellites, their broadcast and precise ephemeris files retrieved from Multi-GNSS Experiment (MGEX) have 1.2–19.4% and 10.9–13.77% discontinuities, respectively, while the discontinuities of BDS-2 satellite broadcast and precise ephemeris are only 0.1 and 2.1%. Second, the BDS-3 satellite orbit accuracies and clock precisions are significantly improved, i.e., below 0.5 m and 1.82 ns compared to 2 m and 2.91 ns for BDS-2 because of the inter-satellite links of BDS-3 satellites. Third, an average of 4.4–5.7 BDS satellites can be observed at stations located in North/South America, and 8.9 for the European station FFMJ located in Germany after the BDS-3 global system announcement. As a result, continuous positioning is feasible in these regions. As to four Asia–Pacific stations, their SPP accuracies are improved by 12.1–60.2% compared to those of the BDS-2-only solution. Meanwhile, the PPP and RTK convergence times of Asia–Pacific stations are also shortened. Last but not least, the new B1C signal does not bring convincing improvement to PPP and RTK positioning accuracies in this study, due to the limited number of available B1C new signals at this time.

中文翻译:

评估BDS-3全球定位服务:星历,SPP,PPP,RTK和新信号

BDS-3初步系统于2018年12月27日宣布开始运行。它可以在全球范围内提供定位服务。这项研究从定位的角度对BDS-3全球服务进行了全面调查,包括卫星星历,新的BDS-3卫星的优势以及新的信号对三种定位模式的影响:单点定位(SPP),精确点定位(PPP)和实时运动学(RTK)。首先,研究了2019年1月至2019年6月18颗BDS-3中地球轨道(MEO)卫星的广播和精确星历表可用性。由于BDS-3卫星的运行时间较短,因此从Multi-GNSS实验(MGEX)检索到的广播和精确星历文件的不连续性分别为1.2-19.4%和10.9-13.77%。而BDS-2卫星广播和精确星历的不连续性分别只有0.1%和2.1%。其次,由于BDS-3卫星之间的卫星间链接,BDS-3卫星的轨道精度和时钟精度得到了显着提高,即BDS-2的卫星轨道精度为2 m和2.91 ns,低于0.5 m和1.82 ns。第三,在BDS-3全球系统宣布之后,在北美/南美的台站平均可观测到4.4-5.7个BDS卫星,在德国的欧洲台站FFMJ则可观测到8.9个。结果,在这些区域中连续定位是可行的。与仅使用BDS-2的解决方案相比,在四个亚太站点中,它们的SPP精度提高了12.1–60.2%。同时,亚太站点的PPP和RTK收敛时间也缩短了。最后但并非最不重要的,
更新日期:2020-06-14
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