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A Regional Space Segment Health Monitor for Local GPS Integrity Monitoring

Published online by Cambridge University Press:  12 September 2011

Carl Milner ,
Washington Ochieng ,
Wolfgang Schuster ,
Marco Porretta  and
Charles Curry
Carl Milner
Affiliation:
(Imperial College London)
Washington Ochieng*
Affiliation:
(Imperial College London)
Wolfgang Schuster
Affiliation:
(Imperial College London)
Marco Porretta
Affiliation:
(Ingegneria Dei Sistemi SpA)
Charles Curry
Affiliation:
(Chronos Technology Limited)
*
(Email: w.ochieng@imperial.ac.uk)
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Abstract

The benefits of Global Navigation Satellite Systems (GNSS) and in particular GPS have been demonstrated worldwide, and continue to accrue in the form of new applications. Today, some mission critical applications (largely driven by safety) mostly in aviation and to a lesser extent maritime, rely on a number of techniques for the provision of integrity monitoring services. However, for many applications such as those associated with the emergency services, road user charging and personal navigation devices, no such monitoring exists and service validation is limited due to technical and cost constraints. The problem is exacerbated by a recent increase in more challenging problems, particularly in the security industry, in which jamming devices have been used to disrupt the use of GPS. This paper presents a new approach for a cost effective local solution to the problems above, at the individual user level, by providing the user with information on Quality of Service (QoS). The approach is based on the deployment of a single or network of probes supported by an existing regional network. The probes communicate with a central server and are designed to detect localised events whilst the regional network isolates space segment anomalies. The latter is addressed in detail in this paper in terms of design methodology and performance, using the Ordnance Survey's UK GNSS network.

Keywords

Integrity MonitoringJammingClock Anomaly
Type
Research Article
Information
The Journal of Navigation , Volume 64 , Issue 4 , October 2011 , pp. 657 - 671
Copyright
Copyright © The Royal Institute of Navigation 2011

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References

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