GPS基线快速计算与跟踪方法探讨

DISCUSSION ON METHODS FOR RAPID COMPUTATION AND TRACKING OF GPS BASELINES

为减少中国地壳运动观测网络提供的GPS最终解的滞后时间,及时跟踪地壳形变的动态,利用提取的GPS长期运动背景外推GPS每日最终解;同时以松弛解H文件中的协方差矩阵为约束条件,对松弛解H文件中的坐标进行7参数转换,得到ITRF2000框架下的GPS当日坐标;用外推的GPS当日解、GPS最终解和H文件分别计算基线长,并对结果进行比较,然后,为了从大量的基线中找出变化幅度较大的基线,利用经验正交函数分析(EOF)方法对活动地块内基线的空间特征进行分析,实现对GPS基线的动态跟踪与监视。

For reducing the lag of obtain of GPS final results from the Crustal Movement Observation Network of China （CMONOC）, and monitoring the trend of the crustal deformation in time, this paper has extrapolated GPS everyday final results from GPS secular movement background. The GPS results on the same day are received under ITRF2000 coordinate frame by transforming the coordinates of H file of relax result using seven parameters, with constraint condition of covariance matrix of H files. GPS baselines have been computed and analyzed using extrapolated GPS results, GPS final results, and H files. Meanwhile, for finding the baselines that are the bigger in range of variation, this paper has analyzed spatial characteristics of GPS baselines in blocks through experimental orthogonal function analysis （EOF）, so to track and moniter GPS baselines in time,can be realized.