Quality Monitoring of Real-Time Precise Satellite Orbit and Clock Corrections for Generating Health Indicators
The Global Navigation Satellite System (GNSS) Precise Point Positioning (PPP) service provides real-time high precision positioning worldwide. It is essential to monitor precise satellite orbit and clock product quality for early alerts to GNSS users. This paper introduces a server-side method to g...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier
2025
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| Online Access: | http://hdl.handle.net/20.500.11937/96941 |
| Summary: | The Global Navigation Satellite System (GNSS) Precise Point Positioning (PPP) service provides real-time high precision positioning worldwide. It is essential to monitor precise satellite orbit and clock product quality for
early alerts to GNSS users. This paper introduces a server-side method to generate Health Indicators (HI) for
satellite corrections. Phase residuals from historical data are modeled as a Residual Hemisphere Map (RHM) to
establish monitoring thresholds based on satellite elevation and azimuth. A satellite subset separation scheme is used to identify all faulty satellites by comparing real-time phase residuals with the corresponding thresholds.
Tests using data from 30 IGS stations show that the RHM-derived thresholds effectively bound residuals under
fault-free conditions. Moreover, the method detects single satellite faults over 5 cm immediately and ramp errors
of 1 cm/epoch within 5 epochs, as well as multiple simultaneous faults. The HI generated can be broadcast to users for excluding faulty satellites. |
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