参考框架的一致性及其对形变分析的影响

分析了形变监测中坐标框架的不一致性对形变分析的影响 ;讨论了借助于全球站在统一的 WGS84或 ITRF坐标框架下的已知坐标将不同历元的观测结果归算到全球框架下作位移场分析时可能存在的实际参考框架的不一致性问题。并按目前的精度水平定量估计了这种不一致的大小以及对位移场的影响。最后对区域形变分析时坐标框架的处理问题提出了若干看法。

CONSISTENCY OF REFERENCE FRAME AND ITS INFLUENCE ON DEFORMATION ANALYSIS

In deformation monitoring the influence caused by the inconsistency of reference frames on the deformation analysisis discussed in this paper.In displacement field analyzing,taking the known coordinates of some fiducial stations in a united reference frame(e.g. WGS84 or ITRF97)as a bases to reduce the observations taken from different epochs into the united frame may still have some problems which are caused by the inconsistency of actual reference frames determined by used different fiducial stations.Based on the actual accuracy of coordinates of fiducial stations,the magnitudes of the inconsistency of reference frame and its influence on displacement field are estimated quantitatively.At the end of this paper some points of view dealing with the reference frame are proposed.