WAD-RNSS 시스템의 LNAV 형식 User Range Accuracy 분석
Analysis of User Range Accuracy in LNAV Message Format for WAD-RNSS
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Satellite navigation provides positioning and timing services through Signal-In-Space (SIS) signals. The User Range Accuracy (URA) is a conservative standard deviation estimate of the SIS User Range Error (URE), which arises from errors in the navigation messages contained within the SIS signals. While the URA computation equation is well established for the GPS, it should be modified for other constellations due to differing orbital haracteristics. This paper derives a URA computation equation for a Wide Area Differential Radio Navigation Satellite System covering the Korean peninsula. This system is assumed to use Inclined Geosynchronous Orbit and Geostationary Earth Orbit satellites. The derived equation accounts for the higher orbital altitudes of these satellites compared to GPS, where URA is assumed to be broadcast in the Legacy Navigation format. Simulation results confirm that the proposed URA formulation conservatively bounds SIS UREs within the service area under various user locations and prediction intervals. Additionally, URA variations for different reference station distributions are analyzed. The results show that a denser and more widely distributed reference station network leads to a smaller URA.
Abstract
Satellite navigation provides positioning and timing services through Signal-In-Space (SIS) signals. The User Range Accuracy (URA) is a conservative standard deviation estimate of the SIS User Range Error (URE), which arises from errors in the navigation messages contained within the SIS signals. While the URA computation equation is well established for the GPS, it should be modified for other constellations due to differing orbital haracteristics. This paper derives a URA computation equation for a Wide Area Differential Radio Navigation Satellite System covering the Korean peninsula. This system is assumed to use Inclined Geosynchronous Orbit and Geostationary Earth Orbit satellites. The derived equation accounts for the higher orbital altitudes of these satellites compared to GPS, where URA is assumed to be broadcast in the Legacy Navigation format. Simulation results confirm that the proposed URA formulation conservatively bounds SIS UREs within the service area under various user locations and prediction intervals. Additionally, URA variations for different reference station distributions are analyzed. The results show that a denser and more widely distributed reference station network leads to a smaller URA.