GPS Integrity Failure Modes and Effects Analysis

K. Van Dyke, Karl Kovach, J. Kraemer, J. Lavrakas, J.P. Fernow, J. Reese, N. Attallah, B. Baevitz

Abstract:	GPS integrity anomalies have long been of great concern to the civil and military GPS communities for safety of life operations. The FAA, USCG, and their international counterparts have focused on how to accomplish integrity monitoring for safety of life services through the use of receiver autonomous integrity monitoring (RAIM), widearea and local-area augmentation systems such as WAAS and LAAS, maritime differential GPS (DGPS) and nationwide differential GPS (NDGPS). The military is preparing to certify PPS RAIM receivers and is in the process of developing the Joint Precision Approach and Landing System (JPALS). Integrity failure modes need to be understood in order to develop a proper monitoring capability. The main objectives of the GPS Integrity Failure Modes and Effects Analysis (IFMEA) project are to identify GPS integrity requirements, examine GPS failure data in order to identify integrity failure modes, examine the causes and effects of the failures, as well as their probability of occurrence, determine the impact of integrity anomalies on users, and recommend preventive actions. The IFMEA project is focused on integrity anomalies that are due to hardware and software failures in the satellite vehicles (SVs) and Operational Control Segment (OCS). The IFMEA project will define algorithms to ensure proper detection of integrity anomalies and identify any design constraints or modifications to the GPS SV and OCS to either prevent failures that degrade integrity or provide protection from any adverse operational impact. Recommendations for modifications to the satellites primarily will be geared toward the GPS III program unless the GPS JPO decides they should be implemented on Block IIR-M or Block IIF satellites and associated control segment components. This paper provides a status update on the current GPS IFMEA effort which is jointly funded by the Interagency GPS Executive Board (IGEB) and the GPS Joint Program Office (JPO). The benefits of this work are to gain a better understanding of integrity anomalies, their probability of occurrence, and how to monitor for them. This information is essential to the design of GPS augmentation system networks to support safety of life operations and will assist in meeting international commitments to describe GPS performance. The work performed under this study also will provide a technical basis to update the SPS Performance Standard and provide input to the PPS Performance Standard currently under development. Finally it will help develop recommendations for improvements to future GPS satellites and the operational control segment.
Published in:	Proceedings of the 2003 National Technical Meeting of The Institute of Navigation January 22 - 24, 2003 Disneyland Paradise Pier Hotel Anaheim, CA
Pages:	689 - 703
Cite this article:	Van Dyke, K., Kovach, Karl, Kraemer, J., Lavrakas, J., Fernow, J.P., Reese, J., Attallah, N., Baevitz, B., "GPS Integrity Failure Modes and Effects Analysis," Proceedings of the 2003 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2003, pp. 689-703.
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