Processing and analysis of BDS-2 B1I/B3I and BDS-3 B1C/B2a joint PPP considering inter system and frequency biases

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-02-24 DOI:10.1016/j.asr.2025.02.045

Jianhui Liu , Shirong Ye , Fengyu Xia , Pengzhi Wei , Yongzhao Fan , Yezhi Song

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引用次数: 0

Abstract

Currently, the BeiDou navigation satellite system, including the second- (BDS-2) and third-generation (BDS-3) satellites, is extensively employed for high-precision positioning, navigation, and timing services by broadcasting multifrequency signals to users worldwide. Careful consideration of the inter system bias (ISB) and inter frequency bias (IFB) presented in BDS legacy and new signals, such as BDS-2 B1I/B3I and BDS-3 B1C/B2a, is a key prerequisite for high-precision BDS-2/3 joint precise point positioning (PPP). In this study, ISB and IFB parameters are introduced into the BDS-2 legacy signals and BDS-3 new signals joint PPP solution, and its effectiveness is systematically demonstrated by using BDS-2 B1I/B3I and BDS-3 B1C/B2a observations collected from 21 stations from day of year (DOY) 161 to190 in 2022. WUM (Wuhan University) and CNES (Center National d’Etudes Spatiales) precise products are employed in the PPP float solutions, while the PPP fixed solutions only used CNES products. The experimental results show that compared with the traditional method without considering the ISB and IFB between the BDS-2 legacy and BDS-3 new signals, introducing the ISB and IFB parameters effectively improves the accuracy of the PPP float and fixed solutions. BDS-2 B1I/B3I and BDS-3 B1C/B2a PPP float solutions achieve an average reduction of over 7.5 min shorter convergence times. For fixed solutions, the mean convergence speed, first fixing speed, and ambiguity fixing rate improve by 19.5 %, 20.6 %, and 16.6 %, respectively. The positioning accuracy in the east direction is improved by 11.8 %, 11.6 %, and 15.3 % for float (WUM, CNES) and fixed (CNES) solutions. Moreover, compared to the solution with only ISB estimation, the consideration of IFB contributes to reduce the PPP-fixed CT and to improve the ISB estimation stability.

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考虑系统间和频率偏差的BDS-2 B1I/B3I和BDS-3 B1C/B2a联合PPP处理分析

目前，北斗导航卫星系统，包括第二代（BDS-2）和第三代（BDS-3）卫星，通过向全球用户广播多频信号，广泛用于高精度定位、导航和授时服务。仔细考虑BDS-2 B1I/B3I和BDS-3 B1C/B2a等BDS传统信号和新信号中出现的系统间偏置（ISB）和频间偏置（IFB），是实现高精度BDS-2/3联合精确点定位（PPP）的关键前提。本研究将ISB和IFB参数引入到BDS-2传统信号和BDS-3新信号联合PPP解决方案中，并利用2022年161 ~ 190年21个站点的BDS-2 B1I/B3I和BDS-3 B1C/B2a观测数据，系统论证了其有效性。PPP浮动解决方案采用武汉大学（WUM）和CNES （CNES）的精密产品，PPP固定解决方案仅采用CNES产品。实验结果表明，与不考虑BDS-2旧信号和BDS-3新信号之间的ISB和IFB参数的传统方法相比，引入ISB和IFB参数有效地提高了PPP浮动和固定解的精度。BDS-2 B1I/B3I和BDS-3 B1C/B2a PPP浮动方案的收敛时间平均缩短了7.5分钟以上。对于固定解，平均收敛速度、首次固定速度和模糊固定率分别提高了19.5%、20.6%和16.6%。浮动（WUM， CNES）和固定（CNES）方案的东向定位精度分别提高了11.8%，11.6%和15.3%。此外，与仅考虑ISB估计的解决方案相比，考虑IFB有助于减少ppp固定的CT，提高ISB估计的稳定性。

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.