학술논문

BDS-3 B1I Signal Tracking Error Characteristic and Its Advantage in PPP Under Ionospheric Scintillation at Low Latitudes
Document Type
Article
Source
IEEE Transactions on Geoscience and Remote Sensing; 2023, Vol. 61 Issue: 1 p1-10, 10p
Subject
Language
ISSN
01962892; 15580644
Abstract
Ionospheric scintillation affects the tracking performance of GNSS code delay-locked loop (DLL) and phase-locked loop (PLL), thus degrading GNSS precise positioning accuracy. To investigate the third phase of BeiDou Navigation Satellite System (BDS-3) signal tracking error characteristic under ionospheric scintillation, this study comprehensively analyzes the standard deviation of tracking error of DLL ( $\sigma _{\mathrm {DLL}}$ ) and PLL ( $\sigma _{\mathrm {PLL}}$ ) for BDS-3 B1I signal by using the data (from July 15, 2021 to August 9, 2022) collected by a newly ionospheric scintillation monitoring receiver (ISMR) station installed with the Septentrio PolaRx5S GNSS receiver at Le Dong of China (18.4°N, 108.9°E; geomagnetic latitude: 11.6°N). The analysis suggests that under scintillation activity, the $\sigma _{\mathrm{ DLL}}$ and $\sigma _{\mathrm{ PLL}}$ points of BDS-3 B1I show more stable and concentrated distribution than those of GPS L1C/A, GLONASS G1C/A, and Galileo E1C. Statistics indicate that the average values of $\sigma _{\mathrm{ DLL}}$ for BDS-3 B1I, GPS L1C/A, GLONASS G1C/A, and Galileo E1C are 0.089, 0.117, 0.100, and 0.126 m, respectively, and those of $\sigma _{\mathrm{ PLL}}$ are 0.563, 0.732, 0.623, and 0.789 mm, respectively. Furthermore, based on $\sigma _{\mathrm{ DLL}}$ and $\sigma _{\mathrm{ PLL}}$ of BDS-3 B1I, the receiver tracking error stochastic (RTES) model for BDS-3 B1I precise point positioning (PPP) is established in this study. The root-mean-square (rms) statistics show that compared with the elevation angle stochastic (EAS) model, the RTES model can improve BDS-3 single-frequency PPP by approximately 32.0%, 23.5%, and 24.3% in September–October of 2021 and by 33.2%, 31.8%, and 31.8% in March–April of 2022 in the east, north, and up directions, respectively.