Temporal Characteristics Based Outlier Detection and Prediction Methods for PPP-B2b Orbit and Clock Corrections

The BeiDou Global Navigation Satellite System (BDS-3) provides real-time precise point positioning (PPP) service via B2b signals, offering real-time decimeter-level positioning for users in China and surrounding areas. However, common interruptions and outliers in PPP-B2b services arise due to facto...

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Bibliographic Details
Published inRemote sensing (Basel, Switzerland) Vol. 16; no. 13; p. 2337
Main Authors Xu, Zhenhao, Shang, Rui, Gao, Chengfa, Gao, Wang, Liu, Qi, Long, Fengyang, Xu, Dawei
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2024
Subjects
Accuracy
BeiDou Navigation Satellite System
Calibration
clock prediction
Data analysis
Geosynchronous orbits
Global navigation satellite system
Global positioning systems
GPS
Measurement
Methods
orbit prediction
Orbits
outlier detection
Outliers (statistics)
PPP-B2b
Predictions
Real time
real-time PPP
Satellite navigation systems
Satellites
China
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Summary:The BeiDou Global Navigation Satellite System (BDS-3) provides real-time precise point positioning (PPP) service via B2b signals, offering real-time decimeter-level positioning for users in China and surrounding areas. However, common interruptions and outliers in PPP-B2b services arise due to factors such as the Geostationary Orbit (GEO) satellite “south wall effect”, Issue of Data (IOD) matching errors, and PPP-B2b signal broadcast priorities, posing challenges to continuous high-precision positioning. This study meticulously examines the completeness, continuity, and jumps in PPP-B2b orbit and clock correction using extensive observational data. Based on this analysis, a two-step method for detecting outliers in PPP-B2b orbit and clock corrections is devised, leveraging epoch differences and median absolute deviation. Subsequently, distinct prediction methods are developed for BDS-3 and GPS orbit and clock corrections. Results from simulated and real-time dynamic positioning experiments indicate that predicted corrections can maintain the same accuracy as normal correction values for up to 10 min and sustain decimeter-level positioning accuracy within 30 min. The adoption of predicted correction values significantly enhances the duration of sustaining real-time PPP during signal interruptions.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs16132337