Rob Conley

Peer Reviewed

Abstract: Proposed solutions to the GPS integrity issue generally focus on means of reliably determining when GPS deviates from some standard of performance acceptable to a given user group, and warning that group not to use the service. One of the key elements in the development of any reliable GPS integrity response system is an understanding of how GPS normally performs. To support that need, this paper examines the performance of the current Block II satellite constellation from a time-ordered and a statistical behavior perspective. The paper begins with a general discussion that relates GPS accuracy characteristics to the integrity problem. The time-ordered behavior of GPS position solution errors is then described, and error behavior dependencies on user location are defined. The paper then develops GPS range and position error statistical distribution characteristics. Finally, the results of the time-ordered and statistical behavior analyses are assessed in terms of their implications for the GPS integrity monitoring and response problem.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 40, Number 3
Pages: 261 - 282
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