GPS???μ?????л???????????????

??????GPS???μ??????2?????????????????y?1?????????????μ?????????CORS??ITRF2005????????????????????????????????????150 km??Χ????й?????????????绪???????????????й????????????????ж??????????????????????????????????????????????????????????????????У????????N??????????????????????????????????????1 mm/a????????????0.5~1 mm??E??U????????????????????????????????????????????????0.1~0.5 mm??

ANALYSIS OF LONG-TERM STABILITY OF REFERENCE STATIONS IN GPS DEFORMATION MONITORING SYSTEM

This paper analyzes the long term stability of two reference stations in GPS deformation monitoring system. The combined adjustment of deformational monitoring network with the Shanxi CORS network is carried out in ITRF2005 consistent coordinates and by using data for one year.and velocities of each point are obtained.Comparison was made between the estimated secular movement rates of reference stations in our calculation and results from stations in the North China region of CMONC (the Crustal Movement Observation Network of China) in 150km range together with grid mean value from velocity filed of Mainland China,it indicats that no obvious non tectonic trends are found at both reference stations. This paper also analyzes short baseline series between the two reference stations. It is shown that linear movement and annual movement exist in N component with rate and amplitude to be 1mm/a and 0.5-1 mm respectivel. Such signals are not obvious in E and U components. Meanwhile, variations were found in all three components with amplitudes of 0.1-0.5 mm.