不同IGS分析中心BDS-3实时精密轨道和钟差产品精度评估  

Evaluation of Real-Time Precise Orbit and Clock Products for BDS-3 from Different IGS Analysis Centers

作　　者：王天润 袁德宝[1] 李允钊 李佳睿 李硕 王阿昊 WANG Tianrun;YUAN Debao;LI Yunzhao;LI Jiarui;LI Shuo;WANG Ahao(College of Geoscience and Surveying Engineering,China University of Mining and Technology-Beijing,D11 Xueyuan Road,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京市100083

出　　处：《大地测量与地球动力学》2024年第5期461-467,共7页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(52174160);中央高校基本科研业务费专项(2022XJDC05);中国矿业大学(北京)大学生创新训练项目(202302043)。

摘　　要：以2022-11连续7 d的精密星历作为参考,对5家机构(CAS、CNES、GFZ、SHA和WHU)提供的BDS-3实时精密产品进行精度评估。结果表明,目前CAS可提供的BDS-3卫星实时精密产品数量最多,但MEO卫星钟差精度最低,超过0.4 ns;GFZ播发的IGSO卫星产品质量最差,径向轨道误差超过30 cm,钟差精度大于0.8 ns;WHU的产品数据质量最好,径向轨道误差优于4 cm,钟差精度约0.16 ns,但其可用卫星数仅19颗。在定位端,对各机构的实时精密产品进行双频无电离层动态实时PPP定位性能对比,结果显示,CNES、SHA、WHU实时产品定位精度处于同一水平,水平、高程方向总体定位误差约为0.2 m。综合考虑可用卫星数及实时产品数据质量,推荐实时PPP用户使用CNES或SHA实时产品。Using the precise ephemeris data from November 2022 for seven consecutive days as a reference,we evaluate and analyze for accuracy the real-time precise products from the 5 organizations(CAS,CNES,GFZ,SHA,and WHU).The experimental results reveal the following:CAS currently provides the highest quantity of real-time precise products for BDS-3 satellites,but the clock accuracy for MEO satellites is the lowest,exceeding 0.4 ns.GFZ’s IGSO satellite products have the poorest quality,with radial orbit errors exceeding 30 cm and clock accuracy greater than 0.8 ns.WHU’s product data quality is best,with radial orbit errors better than 4 cm and clock accuracy of about 0.16 ns,but it has only 19 available satellites.In the positioning domain,we conduct a comparative analysis of real-time precise products from various agencies using dual-frequency,ionosphere-free dynamic real-time Precise Point Positioning(PPP)techniques.The positioning results indicate that the real-time products from CNES,SHA,and WHU exhibit similar levels of positioning accuracy.The overall positioning error in both horizontal and vertical directions is approximately 0.2 meters.Taking into consideration the available number of satellites and the quality of real-time product data,we recommend that real-time PPP users utilize either CNES or SHA’s real-time products.

关 键 词：北斗三号(BDS-3) 实时精密轨道 实时精密钟差 精密星历 精度评估 

分 类 号：P228[天文地球—大地测量学与测量工程]