Analysis of Range and Position Comparison Methods as a Means to Provide GPS Integrity in the User Receiver*
1998 Award Winner
Dr. Young C. Lee, The MITRE Corporation
ABSTRACT
Integrity is the ability of a system to let its users know whether the system is operating out of its specified performance limits. This paper analyzes two receiver-based methods for assuring the integrity of Global Positioning System (GPS) signals-in-space for the purpose of determining whether the methods can do the job satisfactorily. These methods are called the range comparison method and the position comparison method. Equations relating unknown satellite range errors to the quantity measured in each method are analyzed. The equations reveal important characteristics of the methods, including their mathematical equivalence. The performance of the two methods is then derived as a function of the range error magnitude of the failed satellite. Finally, numerical results for the performance of the methods are shown, both alone and in combination with monitoring of the receiver clock bias estimate.
*This paper is based upon navigation system studies performed by The MITRE Corporation for the Systems Engineering Service, Federal Aviation Administration under Contract No. DTFA01-84-C-00001. The data presented herein do not necessarily reflect the official views or policy of the FAA.
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