The Global Positioning System (GPS) is required to provide signals and services to support user positioning, navigation, and timing services to civilian agencies. Monitoring of those signals is necessary so that operators and users are aware that the service is meeting its stated commitments.

This trade study examines two alternatives for implementing civil monitoring, looking at cost effectiveness, risk, and integration with operations. Based on evaluations of key metrics, a hybrid system of the Next Generation Operational Control System (OCX) segment and the use of a civil signal monitoring system provided by a civil government agency or a non-OCX system is recommended.

This report was prepared for the Federal Aviation Administration by Volpe author Andrew Hansen.

Report: Global Positioning System (GPS) Civil Signal Monitoring (CSM) Trade Study Report (PDF)

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