A Static and Dynamic Error Analysis of the Operational GPS WAAS for Use in Precision and Non-Precision Approaches

摘要

This paper presents the results of extensive testing both inrnthe static mode and the dynamic mode of two of therncurrent MOPS compliant receivers and the Gammarnnavigator. The paper will present a detailed comparisonrnof two of the WAAS MOPS implementations. The paperrnwill identify contributions to the error due to signal inrnspace and position sensoravigator. The paper examinesrnthe results of tests to determine the effects of solutionrnlatency and time constants to the Navigation System Errorrn(NSE). The results of actual flight tests on precisionrnapproaches will be used to examine the NSE. Arnfrequency analysis was conducted on the Signal in Spacern(SIS) error and the Navigation System Error. Thisrnfrequency analysis is presented in terms of the effects thatrnthe error has on a precision approach in the FinalrnApproach Segment. The paper will also address issues ofrnGPS navigation such as WAAS availability and integrityrnin an airborne application.rnThe WAAS signal in space used during the tests reportedrnin this paper was provided by both the National SatelliternTest Bed (NSTB) and Raytheon. Therefore, a look at thisrnnew Raytheon test signal’s properties will be provided asrna part of this paper.rnThe paper represents the partial results of work beingrnconducted by the FAA and the University of Oklahoma inrnthe application of WAAS and LAAS to precisionrnapproach and landing techniques.