Protect Yourself! Navigation Payload Anomalies and the Importance of Adhering to ICD-GPS-200

Brian C. Barker, Stacy Jo Huser

Abstract:	With the significant growth and dependence upon GPS applications worldwide, the integrity of receiver design is of utmost importance. GPS satellites are engineered with hardware and software features to inform users of corrupt navigation signals. Whether a feature is enabled by the 2d Space Operations Squadron (2 SOPS) or by the satellite itself, indications of a satellite anomaly will be broadcast through the navigation message. The protective design of the Block II, IIA, and IIR satellites extends beyond the standard health bits and is reflected in ICD-GPS-200, NAVSTAR GPS Space Segment to Navigation User Interface. Compliance with this document is a critical factor in receiver design. However, as seen in recent incidents, receiver manufacturers apparently have overlooked many of these safeguards. This paper will discuss the most probable navigation payload hardware and software anomalies and their effect on the navigation signal. The authors will also explain the ability of 2 SOPS to detect and protect the user from erroneous data. The ultimate goal is to educate GPS users and receiver manufacturers on the vital importance of adhering to ICD-GPS-200C.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	1843 - 1854
Cite this article:	Barker, Brian C., Huser, Stacy Jo, "Protect Yourself! Navigation Payload Anomalies and the Importance of Adhering to ICD-GPS-200," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 1843-1854.
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