Abstract
Integrity continues to be a major issue preventing user acceptance of GPS. Substantial effort has therefore been invested in the pursuit of failure detection and warning system (FDWS) concepts to improve upon the existing integrity of the GPS positioning services. Notable progress has been made towards FDWS approaches, such as an independent GPS integrity channel (GIC) and receiver autonomous integrity monitoring (RAIM). This paper presents the conceptual outline of a new FDWS called “SATZAP.” It is a novel approach that takes maximum advantage of existing GPS resources. It utilizes the operational control system (OCS) and on-orbit Block II space vehicles (SVs) already built by the Department of Defense. Its user warning method is unique amongst FDWSs. Failed SVs would simply be turned “off” as far as the user is concerned. Turning an SV “off” within the integrity time limit is inherently compatible with all types of GPS receiver equipment; absolutely no user receiver modifications are required, and the warning cannot be misinterpreted.
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