Paper Info
Title
Covariance Analysis of Real-Time Precise GPS Orbit Estimated from Double-Differenced Carrier Phase Observations.
Abstract
The covariance of real-time global positioning system (GPS) orbits has been drawing attention in various fields such as user integrity, navigation performance improvement, and fault detection. The international global navigation satellite system (GNSS) service (IGS) provides real-time orbit standard deviations without correlations between the axes. However, without correlation information, the provided covariance cannot assure the performance of the orbit product, which would, in turn, causes significant problems in fault detection and user integrity. Therefore, we studied real-time GPS orbit covariance characteristics along various coordinates to effectively provide conservative covariance. To this end, the covariance and precise orbits are estimated by means of an extended Kalman filter using double-differenced carrier phase observations of 61 IGS reference stations. Furthermore, we propose a new method for providing covariance to minimize loss of correlation. The method adopted by the IGS, which neglects correlation, requires 4.5 times the size of the covariance to bind orbit errors. By comparison, our proposed method reduces this size from 4.5 to 1.3 using only one additional parameter. In conclusion, the proposed method effectively provides covariance to users.
Year
DOI
Venue
2019
10.3390/rs11192271
REMOTE SENSING
Keywords
Field
DocType
precise GPS orbit,real-time precise GPS orbit covariance,carrier phase,precise orbit reliability
Orbit,Carrier phase,Remote sensing,Global Positioning System,Geology,Analysis of covariance
Journal
Volume
Issue
Citations 
11
19
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Sunkyoung Yu100.68
Donguk Kim233.44
junesol song352.52
Changdon Kee47179.23