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Sensors 2018, 18(6), 1816; https://doi.org/10.3390/s18061816

Real-Time Monitoring for BDS Signal-In-Space Anomalies Using Ground Observation Data

1
Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
2
State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
*
Author to whom correspondence should be addressed.
Received: 9 May 2018 / Revised: 1 June 2018 / Accepted: 1 June 2018 / Published: 4 June 2018
(This article belongs to the Special Issue GNSS and Fusion with Other Sensors)
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Abstract

Signal-in-space (SIS) User Range Error (URE) is one of the major error sources for BeiDou Navigation Satellite System (BDS) applications and can reach tens of meters or even more. Therefore, real-time monitoring of SIS anomalies has a great realistic significance to guarantee the safety of users. According to an analysis of the BDS navigation messages, it showed that the User Range Accuracy (URA) index could not reflect the change of URE when it was abnormal. The conventional models using the relationship between URA and URE to monitor SIS anomalies are not suitable to the present BDS. Therefore, we use a prior information of SIS URE derived from ground observational data instead of URA to monitor BDS SIS anomalies. In order to realize the corresponding functions, we analysed the distribution of SIS UREs and obtained their prior models. Then, the monitoring threshold is determined using the prior models and a confidence interval instead of URA. The scheme was tested by applying to BDS SIS anomalies monitoring based on 13 ground tracking stations. The performance of this method was assessed by comparison with the satellite-health indicators from broadcast ephemeris. The results confirm that the method developed in this paper can rightly and timely detect abnormal SIS. View Full-Text
Keywords: signal-in-space (SIS); User-Range Error (URE); BeiDou Navigation Satellite System (BDS); User Range Accuracy (URA); SIS anomalies signal-in-space (SIS); User-Range Error (URE); BeiDou Navigation Satellite System (BDS); User Range Accuracy (URA); SIS anomalies
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jiang, H.; Wang, H.; Wang, Z.; Yuan, Y. Real-Time Monitoring for BDS Signal-In-Space Anomalies Using Ground Observation Data. Sensors 2018, 18, 1816.

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