特定基准下的异常位移诊断

Diagnosis of Abnormal Displacement Based on Special Datum

针对地壳运动和变形研究中存在的位移资料的参考基准、异常位移等问题 ,主要讨论了位移资料特定基准的转换和异常位移诊断的数学模型———特定基准转换模型为七参数相似变换模型 ,转换保持了变形体内部相对位置关系不变 ,并使转换后的位移矢量更能体现区域内的相对运动信息 ;异常位移诊断采用拟准检定法 (QUAD) ,在选定拟准观测的情况下 ,使得位移真误差具有明显的分群性 ;模拟算例结果显示 ,本文采用的线性变换模型。

The transformation model under special datum employed in this paper is the similarity transformation model with seven transformation parameters; this transformation can keep the steadiness of the relative position in the deformation block and can express the relative movement information of transformed displacement vectors in the block. The diagnosis of abnormal displacements is performed using quasi-accurate detection method (QUAD). After properly selecting the quasi-accurate observations, this method can make the real errors of displacement take on the distinct hive off phenomena. The results of a simulated example show good effect of linear similarity transformation method and QUAD method.