Performance evaluation of precise positioning and time-frequency transfer considering ISB between BDS-2 and BDS-3

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), pet.2024, Vol.47 No.9: 1202-1212

DOI: 10.3969/j.issn.1003-5060.2024.09.008

Authors

DU Chenxi $ ^{1} $, WANG Xudong $ ^{1} $, GU Yubao $ ^{1} $, LIAO Zhenxiu $ ^{2} $

(1. Construction Company of State Grid Anhui Electric Power Co., Ltd., Hefei 230071, China; 2. School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China)

Abstract and Keywords

Abstract: BeiDou Navigation Satellite System (BDS)-3 has officially provided positioning, navigation and timing services to global users on July 31, 2020. Due to the differences in signal modulation modes and characteristics between BDS-2 and BDS-3, there will be inter-system bias (ISB) when the receiver receives and processes BDS-2 and BDS-3 signals. This paper adopts four random models: ignoring ISB(ISB $ _{NO} $), ISB estimation as constant(ISB $ _{CT} $), ISB estimation as random walk(ISB $ _{RW} $) and ISB estimation as white noise(ISB $ _{WN} $). GBM, WUM and CLK93 real-time precision products are used respectively. Based on the observation data of BRUX, CEDU, CUT0, HOB2, HARB and PTBB, the performance of mimic real-time and post precise point positioning (PPP) and time-frequency transfer of BDS-2/BDS-3 combination was evaluated. The results show that the average PPP positioning accuracy and convergence time of GBM and WUM products are both 1.7 cm and 23.3 min. The positioning and time-frequency transfer performance of the ISB estimation strategy is slightly better than that of the ignoring ISB strategy, and the data processing strategy of ISB $ _{CT} $ is the best. The 3D positioning accu-

Keywords: BeiDou Navigation Satellite System (BDS); inter-system bias (ISB); precise point positioning (PPP); positioning; time-frequency transfer

作者信息

堵晨曦 $ ^{1} $，王旭东 $ ^{1} $，谷玉宝 $ ^{1} $，廖振修 $ ^{2} $

(1. 国网安徽省电力有限公司建设分公司，安徽合肥 230071；2. 安徽建筑大学土木工程学院，安徽合肥 230601)

摘要和关键词

摘要: 北斗卫星导航系统(BeiDou Navigation Satellite System, BDS)-3已于2020年7月31日正式向全球用户提供定位、导航和授时服务，因BDS-2与BDS-3在信号调制方式及特性上存在差异，接收机端在接收与处理BDS-2、BDS-3信号时将存在系统间偏差(inter-system bias, ISB)。文章采取忽略ISB(ISB $ _{NO} $)、ISB估计为常数(ISB $ _{CT} $)、ISB估计为随机游走(ISB $ _{RW} $)、ISB估计为白噪声(ISB $ _{WN} $)4种随机模型，分别使用GBM、WUM、CLK93实时精密产品，基于BRUX、CEDU、CUT0、HOB2、HARB、PTBB站点的观测数据，对BDS-2/BDS-3组合事后、仿实时精密单点定位(precise point positioning, PPP)及时频传递性能进行评估。结果表明：GBM、WUM产品事后平均PPP定位精度、收敛时间均在1.7 cm、23.3 min，估计ISB策略的定位及时频传递性能均稍优于忽略ISB策略，ISB $ _{CT} $的数据处理策略最优。CLK93产品仿实时PPP的三维定位精度优于4.0 cm，估计ISB与忽略ISB的定位精度相当、收敛时间有所缩短、时频传递稳定度有所提升，ISB $ _{CT} $、ISB $ _{RW} $、ISB $ _{WN} $相比ISB $ _{NO} $解算策略在60 000 s的平均频率稳定度分别提高了8.03%、25.32%、24.21%。综合比较，BDS-2/BDS-3组合PPP的ISB $ _{CT} $、ISB $ _{RW} $策略定位及时频传递性能优于ISB $ _{NO} $、ISB $ _{WN} $策略。

关键词: 北斗卫星导航系统（BDS）；系统间偏差（ISB）；精密单点定位（PPP）；定位；时频传递

Funding

国家自然科学基金青年科学基金资助项目（41906168）

合肥工业大学学报(自然科学版)

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