GPS/BDS三频信号频间时钟偏差估计与定位验证

doi:10.13474/j.cnki.11-2246.2022.0364

测绘通报 ›› 2022, Vol. 0 ›› Issue (12): 102-109.doi: 10.13474/j.cnki.11-2246.2022.0364

GPS/BDS三频信号频间时钟偏差估计与定位验证

张高舰¹, 赵齐乐¹, 陶钧², 郭靖¹, 李圳¹

1. 武汉大学卫星导航定位技术研究中心, 湖北武汉 430079;
2. 武汉大学测绘学院, 湖北武汉 430079

收稿日期:2021-12-06 修回日期:2022-08-30 出版日期:2022-12-25 发布日期:2023-01-05
通讯作者: 陶钧。E-mail:jtaowhu@whu.edu.cn
作者简介:张高舰(1998-),男,硕士生,主要研究方向为多频多模精密单点定位。E-mail:gaojian_z@whu.edu.cn
基金资助:
国家自然科学基金（42030109；42074032；42004020）

Estimation and validation of inter-frequency clock bias on GPS/BDS triple signals

ZHANG Gaojian¹, ZHAO Qile¹, TAO Jun², GUO Jing¹, LI Zhen¹

1. GNSS Research Center, Wuhan University, Wuhan 430079, China;
2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

Received:2021-12-06 Revised:2022-08-30 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

摘要： 在三频GNSS应用中，受精密产品频率基准不一致的影响，会引入系统性偏差，即频间时钟偏差（IFCB）。本文首先通过对IFGF组合观测值进行历元差分，利用全球分布的80个MGEX观测站及中国区域内100个连续运行参考站，在2021年年积日（DOY）153—160 d的实测数据，进行了IFCB的估计并分析了其时变特性；然后将IFCB的估计结果运用到非差非组合PPP中。结果表明：GPS BLOCK Ⅱ-F的IFCB较大，幅值可达14 cm，GPS BLOCK Ⅲ与BDS的IFCB则较小，一般不超过5 cm。在定位验证中，经过IFCB改正后，GPS/BDS-2/BDS-3-IGSO在第3频点L5、B2I、B2a的相位残差分别减小了59.54%、26.31%、10.98%。其中，动态定位的GPS、BDS-2/BDS-3-IGSO、GPS/BDS-2/BDS-3-IGSO 3种方案的点位精度分别提升了56.55%、29.16%、20.72%，改善效果显著。

关键词: 三频, 频间时钟偏差, 历元差分, 时变特性, 精密单点定位

Abstract: In three-frequency GNSS data analysis, a systematic deviation named as inter-frequency clock bias (IFCB) arises due to the inconsistent frequency reference of clock products. Using data from 80 globally MGEX stations and 100 regionally CORS stations in China on day of year 153-160 in 2021, the epoch will be brought in differences of IFGF combinations are formed to realize a estimation of IFCB and analysis of the time-varying characteristics further. Finally, the estimated IFCB is applied to the undifferenced and uncombined PPP. The results show that the IFCB of GPS BLOCK Ⅱ-F with an amplitude up to 14 cm is larger than that of GPS BLOCK Ⅲ and BDS (generally less than 5 cm). For PPP validation, the GPS positioning accuracy has improved significantly with considering IFCB. The phase residuals of GPS/BDS-2/BDS-3-IGSO at the third frequency L5/B2I/B2a are reduced by 59.42%, 24.66%, and 16.00, respectively, and The point accuracy of GPS, BDS-2/BDS-3-IGSO, GPS/BDS-2/BDS-3-IGSO improve by 56.55%, 29.16%, and 20.72% in kinematic mode.

Key words: triple-frequency, IFCB, epoch-difference, time-varying characteristics, precise point positioning

中图分类号:

P228

张高舰, 赵齐乐, 陶钧, 郭靖, 李圳. GPS/BDS三频信号频间时钟偏差估计与定位验证[J]. 测绘通报, 2022, 0(12): 102-109.

ZHANG Gaojian, ZHAO Qile, TAO Jun, GUO Jing, LI Zhen. Estimation and validation of inter-frequency clock bias on GPS/BDS triple signals[J]. Bulletin of Surveying and Mapping, 2022, 0(12): 102-109.

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GPS/BDS三频信号频间时钟偏差估计与定位验证

Estimation and validation of inter-frequency clock bias on GPS/BDS triple signals

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