Single-site Carrier Phase Based Troposphere Integrity Monitoring

Y. Zhang and C. Bartone

Abstract:	This paper initiates the integrity considerations in the presence of a troposphere anomaly for National Differential Global Positioning System - High Performance (NDGPS-HP) applications. A single-site carrier phased based troposphere integrity monitoring approach was developed and investigated. The overall concept for this single-site troposphere monitoringapproach is that each reference site monitors the difference between the troposphere model estimate and the measured troposphere error; once the difference is greater than a predefined threshold, an alert message is sent to the user, who will take appropriate actions. This action will enable the user to not unknowingly use error prone measurements. Field GPS data in combination with simulated weather front data were used to demonstrate the effectiveness of this single-site based monitoring approach. The results indicate that this approach is able to detect some rapid troposphere anomaly error but not able to detect some slow rate of troposphere anomaly error due to the limitations in the GPS SV short term clock deviation. In the future research, the DD carrier phase residual deviation can be formed for troposphere anomaly detection; this requires the NDGPS reference station to be networked together at the measurement processing level in real-time, and a processing mechanism to deliver an integrity alert (and associated sigma's) to the mobile user in a timely fashion. These results also provide an indication of the magnitude of the short term SV clock stability required in future GNSS SVs needed to make this single-site monitoring approach applicable for high performance (i.e., cm level) applications.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	530 - 542
Cite this article:	Zhang, Y., Bartone, C., "Single-site Carrier Phase Based Troposphere Integrity Monitoring," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 530-542.
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