QUALITY CHECK OF GPS OBSERVATIONS UNDER UHV
TRANSMISSION LINE
1)School of Geodesy and Geomatics, Wuhan University, Wuhan 430079
2)Key Laboratory of Precise Engineer and Industry Surveying of SBSM，Wuhan 430079
3）College of Geomatics and Urban Information,Beijing University of Civil Engineering and Architecture,Beijing 100044
Abstract In order to analyze the interference of ultra high voltage (UHV) transmission line on the GPS signals, several GPS stations with different distances to the first 1 000 kv UHV transmission line in Hubei province were constructed. Both live and offline GNSS observations were captured, and then were extracted with the same satellites. According to the GPS orbiting regularity, by using the software TEQC, the multipath of P1 and P2, signaltonoise ratio of L1 and L2, and data perfectness ratio of GPS observation data were analyzed. The results indicated that the obvious interference of the UHV AC transmission line to the GPS signals with difference distance had not been found.
