BDS Satellite-Based Augmentation Service Correction Parameters and Performance Assessment

Abstract

BDS (Beidou Navigation Satellite System) integrates the legacy PNT (Positioning, Navigation, Timing) service and the authorized SBAS (Satellite-Based Augmentation Services) service. To support the requirement of decimeter-level positioning, four types of differential corrections are developed in the BDS SBAS, including the State Space Representation (SSR)-based satellite orbit/clock corrections, the Observation Space Representation (OSR)-based ionospheric grid corrections, and the partition comprehensive corrections. In this study, we summarize the features of these differential corrections, including their definition and usages. The function model of precise point positioning (PPP) for dual- and single-frequency users using the four types of BDS SBAS corrections are proposed. Datasets are collected from 34 stations over one month in 2019, and PPP is performed for all the datasets. Results show that the root mean square (RMS) of the positioning errors for static/kinematic dual-frequency (DF) PPP are of 12 cm/16 cm in horizontal and 18 cm/20 cm in vertical component, while for single-frequency (SF) PPP are of 14 cm/32 cm and 22 cm/40 cm, respectively. With regard to the convergence performance, the horizontal and vertical positioning errors of kinematic DF-PPP can converge to 0.5 m in less than 15 min and 20 min, respectively. As for the kinematic SF-PPP, it could converge to 0.8 m in horizontal and 1.0 m in vertical within 30 min, where the ionosphere-constrained PPP performs better than the UofC PPP approach, owing to the contribution of the ionospheric grid corrections.

Performance improvement of the GAGAN satellite-based augmentation system based on local ionospheric delay estimation in Thailand

“…Similarly, the KMIT (Local) follows a similar trend to the KMIT(IGPs) except for some results after sunset on the 2nd and 5th of March D . On the other hand, the VIC at both KMIT* (Local) and STFD* (Local) are markedly different from the KMIT(IGPs) and KMIT (Local) since both are not the actual ionospheric delays, but they include the remaining errors in fast and long-term corrections (Chen et al 2020). These discrepancies are common because the error corrections are different at each location, and Thailand is at the edge of the GAGAN service.…”

Principle and performance of BDSBAS and PPP-B2b of BDS-3

“…The construction of China's SBAS, known as BDSBAS, is completed. The corresponding single frequency and dual frequency positioning performances were described and analyzed (Chen et al, 2020;Yang et al, 2021); the dual frequency integrity parameter performance of BDSBAS (Shao et al, 2020) and the ephemeris correction performance of BDSBAS in China (Jin et al, 2021) were also analyzed. Since the ionospheric correction is an important influencing factor, some scholars analyzed the ionospheric anomaly detection method of BDSBAS (Bao et al, 2019).…”

Comparison of three widely used multi‐GNSS real‐time single‐frequency precise point positioning models using the International GNSS Service real‐time service

“…The Net_Diff software (http://202.127.29.4/shao_gnss_ac/Net_diff/Net_diff.html) is utilised to carry out multi‐GNSS RT‐SFPPP in the kinematic modes [36–37]. The detailed data processing strategies and adopted models for quad‐system positioning are presented in Table 3.…”