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

doi:10.13474/j.cnki.11-2246.2022.0364

Abstract

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

CLC Number:

P228

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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