【摘要】 采用“中国地壳运动观测网络”区域网 1999、2 0 0 1年的观测资料 ,利用GAMIT和GIPSY解出了测站位移速度值 ,并对这两种解算结果进行了对比分析。在 92 0个观测站中 ,位移速度差东西、南北分量的平均值分别为(0 .2 5± 0 .0 8)mm/a与 (1.33± 0 .0 7)mm/a ,服从 (0 .2 ,2 .3)、(1.3,2 .2 )正态分布 ,两者无大系统差异 ,但大约 2 / 3的测站速度差幅度在 2～ 6mm/a之间。导致速度场差异的原因可能是实现统一参考框架的误差和观测时间间隔不长对季节性地壳变动的放大作用等。更多还原

【Abstract】 Two sets of GPS-derived velocity data given respectively by GIPSY and GAMIT for two CMONOC campaigns in 1999 and 2001 are compared with each other. Averaged over 920 sites, the velocity discrepancies in east -west and north-south components are 0.25±0.08 mm/a, 1.33±0.07 mm/a respectively. The discrepancies obey statistically to the normal distribution of N(0.2,2.3) and N(1.3,2.2). The two solutions are consistent with each other and there is no big systematic error between them. The minor bias are attributed to some uncertainties associated with GPS orbit and realization of a consistent reference frame, which might be amplified considerably by shorter observation span. It is concluded that current velocity rate derived from campaigns in interval of 2 years or 3 may be biased in some regions and it can be improved with more data available in the future.更多还原