Tracking and data quality analysis of BDS-3 satellites from the global network

In view of the large differences and changes in the number of tracking satellites used by tracking stations for Beidou-3 Global Navigation Satellite System and the uneven quality of the observation data, the global network observation data is based on three major open datasets, namely, the International GNSS Service (IGS) Tracking Network, the European Reference Framework (EUREF) Tracking Network and the Australian Geological Sciences Agency (GA) Continuous Operations Tracking Network. The number of satellites receiving different BDS-3 signals and the change of maximum PRN number for each tracking station during the year since BDS-3 was officially opened are analyzed. The quality of one month’s observation data of 473 tracking stations is evaluated based on four indicators: data integrity rate, cycle skip ratio, code pseudo-range multipath error and number of visible satellites. The results showed that as of 31 July 2021, 223, 516 and 142 tracking stations can receive B1C/B2a, B1I/B3I dual-frequency and B2b observations in the above-mentioned global network, of which 97.8%, 70.2% and 99.3% can receive at least 18 BDS-3 satellites, respectively. Receiver and firmware versions capable of receiving all BDS-3 satellites mainly include JAVAD TRE_3/3.7.10, TRIMBLE ALLOY/5.44/5.45, SEPT ASTERX4/4.8.2, SEPT POLARX5/5.4.0, LEICA GR30/4.50/7.710, LEICA GR50/4.50.274, STONEX SC2200/2.12-210201, CHC P5E/1.2.5RUS. Among the 473 tracking stations, 71% have 100% data integrity, 64.1% have no more than 1 cycle-slip ratio (CSR), and 90.7% have 0.2-0.6 m pseudo-range multipath error. 208 tracking stations capable of receiving B1I/B3I dual-frequency signals and 134 tracking stations capable of receiving B1C/B2a dual-frequency signals were selected with better data quality. The results can serve as references for BDS-based navigation, positioning and timing (PNT) service.针对北斗三号全球卫星导航系统（Beidou-3 Global Navigation Satellite System, BDS-3）跟踪站所用跟踪卫星数量差异大、动态变化显著，且观测数据质量参差不齐的现状，本次研究所用全球组网观测数据源自三大公开数据集：国际GNSS服务（International GNSS Service, IGS）跟踪网、欧洲参考框架（European Reference Framework, EUREF）跟踪网，以及澳大利亚地质科学局（Australian Geological Sciences Agency, GA）连续运行跟踪网。本研究分析了BDS-3正式开通以来一年内，各跟踪站接收不同BDS-3信号的卫星数量，以及各站最大伪随机噪声码（Pseudo-Random Noise, PRN）编号的变化情况；基于数据完整率、周跳比、码伪距多路径误差以及可见卫星数四项指标，对473个跟踪站为期一个月的观测数据质量开展了评估。结果显示，截至2021年7月31日，上述全球跟踪网中分别有223个、516个和142个跟踪站可接收B1C/B2a、B1I/B3I双频及B2b观测信号，其中97.8%、70.2%和99.3%的站点可至少接收18颗BDS-3卫星。可接收全部BDS-3卫星信号的接收机及固件版本主要包括：JAVAD TRE_3/3.7.10、TRIMBLE ALLOY/5.44/5.45、SEPT ASTERX4/4.8.2、SEPT POLARX5/5.4.0、LEICA GR30/4.50/7.710、LEICA GR50/4.50.274、STONEX SC2200/2.12-210201、CHC P5E/1.2.5RUS。在473个跟踪站中，71%的站点数据完整率为100%，64.1%的周跳比（cycle-slip ratio, CSR）不超过1，90.7%的站点码伪距多路径误差处于0.2~0.6米区间。最终筛选出数据质量更优的208个可接收B1I/B3I双频信号的跟踪站，以及134个可接收B1C/B2a双频信号的跟踪站。本研究结果可为基于北斗系统的导航、定位与授时（Positioning, Navigation and Timing, PNT）服务提供参考依据。

搜集汇总

背景与挑战

背景概述

该数据集基于全球三大开放跟踪网络（IGS、EUREF和GA），对北斗三号卫星的全球跟踪情况及观测数据质量进行了系统分析。数据集评估了473个跟踪站的数据质量，包括数据完整性、周跳比、多路径误差和可见卫星数等关键指标，并识别了支持所有BDS-3卫星的接收机和固件版本。分析结果可为基于BDS的导航、定位和授时服务提供参考。