Thursday 25 August 2005

G1

PTH0002
Constructing a system to monitor the data quality of GPS Receivers
Yeh, Ta-Kang¹, Chen, Chun-Sung¹
1 Ching Yun University, Taiwan, R.O.C.
Author email: ccs@cyu.edu.tw
In Taiwan, there are more than one hundred GPS tracking stations maintained by Ministry of the Interior (MOI), Academia Sinica, Central Weather Bureau and Central Geological Survey. In the further, they may be instead of the GPS controlling points after giving the lawful status. Therefore, the data qualities of the tracking stations are more and more important. For maintaining and ensuring the positioning accuracy of the GPS receivers, an accurate and efficient system for calibrating the GPS receivers must be established. A highly accurate GPS calibration network, tied to the ITRF coordinates of IGS stations, can be effectively used to evaluate the performance of GPS receivers. This study addresses the feasibility of establishing a system for monitoring and calibrating GPS receivers. First, five data quality indexes were adopted and the relationships of the indexes and the positioning precision were found. The frequency stability of GPS receiver is the most importand index, the cycle slip is the second index, and the mutlipath is the third index. According to the results, the auto-analytical system of GPS data quality was established and the MOI¡|s tracking stations were monitored. When the receiver got some problem or the station¡|s environment changed, we hope to find and resolve the problems earlier to make sure the high data quality of the tracking stations.

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