区域性地表形变分析中稳健坐标基准的确定

ESTABLISHMENT OF ROBUST DATUM OF ANALYSIS OF REGIONAL CRUSTAL DEFORMATION

为更客观合理地反映实际位移,提出按位移分量的一次范数为最小的抗差估计方法确定相对稳定点组,与通常采用的拟稳平差不同,它毋须基于对点位形变情况的先验假设。为有效地区分水平位置和垂直方向的相对稳定点,采用新大地坐标系的点位位移表述。利用上海地区GPS监测网的两期实测数据进行计算,证明了该方法应用于形变分析的可行性和有效性。

In order to indicate actual displacement objectively and reasonably, a robust estimation with minimum first order norm of displacement component is offered to determine relative stability displacement, and it does not have to make any assumption for deformation of points, being different from ordinary quasi-stable adjustment. A new form of geodetic coordinates is adopted to express displacement for effectively judging relative stable points with horizontal and vertical orientation. Two stages of data from GPS deformation monitoring net in Shanghai area are calculated with this method to prove that this method is feasible and effective for strain analysis.