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Research of GPS Satellite Clock Error Integrity Monitoring and Algorithm Implementation

Author: FangShuShan
Tutor: MiJinZhong
School: Liaoning Technical University
Course: Geodesy and Survey Engineering
Keywords: Clock error Integrity Monitoring Base station Clock estimation Gross error detection
CLC: P228.4
Type: Master's thesis
Year: 2011
Downloads: 54
Quote: 0
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Abstract


The difference between the satellite clock frequency drift caused by the satellite clock time and GPS standards called satellite clock error . Occupies an important positioning satellite clock error in precision positioning , high-precision GPS measurements , in the final analysis, is a high-precision time measurement . IGS service center can provide accuracy close to 0.01ns afterwards precision clock . Precision after the satellite clock estimation has been no problem , and be able to meet the needs of precision positioning . However, due to the the spaceborne bell very sensitive , highly vulnerable to the impact of the external environment , which will happen irregular transition , and in severe cases can lead to the failure of the navigation and positioning . Signal to consider security from the user to be able to monitor the signal containing satellite clock error gross error , and timely warning to the user , it is very important to this role and significance . Starting from the point of view of safety of navigation satellite signals use the GPS satellite clocks integrity monitoring concept . Containing the rough poor satellite clock error , removed , and a timely warning to the user , to provide users with GPS satellite clocks integrity monitoring is to identify \safety. This paper focuses on the GPS satellite clock Integrity Monitoring Research and algorithm implementation , mainly from the following aspects : 1 , the use of to eliminate ionospheric combination carrier smoothed pseudorange value , LAN estimated satellite relative clock error and its accuracy . Which , respectively, with the ground station and space borne bell estimate as a base station , the same conclusion drawn by the two methods . 2 , based on the estimated satellite clock error residuals , a linear transformation by QR parity method , cluster analysis using Euclidean distance and correlation coefficient index , the final class clustered into two groups : contain gross errors in satellite vector group and does not contain gross errors in satellite vector group . Contain gross errors in the satellite group that vector , satellite prompts gross error to the user , to achieve complete sexual alarm . 3 , the use of VC and Fortran mixed language, the development of GPS satellite clock error integrity monitoring software . The software Hebei CORS network data processing , eliminate poor quality of the clock error of the satellite , to \The software basically have the engineering application conditions .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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