GPS变形监测系统中基准站长期稳定性分析

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

分析了GPS变形监测系统中2个基准站的稳定性。利用近1年的观测数据将变形监测网与山西CORS在ITRF2005框架内进行联合平差得到各点的坐标与速度,并与150 km范围内的中国地壳运动观测网络华北地区复测站以及中国大陆速度场格网值进行对比,结果表明基准站不存在明显的局部非构造运动趋势。同时分析了两个基准站间的短基线序列,结果表明N分量存在线性运动及周年运动,线性运动速率为1 mm/a,周年运动振副为0.5～1 mm,E,U分量周年运动并不明显;同时各分量上存在微弱的波动,量级为0.1～0.5 mm。

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. Com- parison 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 150kin range together with grid mean value from velocity filed of China's Mainland, 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 1 mm/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.