垂线偏差时间变化的精度估计

Estimate Accuracy of Plumb-line Defletion from Gravity Change with Time

对于利用Vening Meinesz微分公式计算垂线偏差随时间变化的测定精度进行了初步估计。通过对地形改正项的影响、代表误差的影响、远区域重力异常的影响等 3种主要误差的分析和实际估计 ,论证了它们对计算结果的综合影响不超过 0 .0 1″,比铅垂线的时间变化 0 .1″要高一个量级。因此认为重力方法在实践中是可行的。

This paper presents a preliminary assessment of the accuracy of the temporal variation of vertical deflections on the basis of the Vening Meinesz differential formulae. Through assessment and numerical estimation of three dominant influences, terrain correction, commission error and gravity anomaly of far areas, it is proved that the total effects of these influences is no more than 0.01″, whose magnitude is higher than that of the temporal variation of plumb line, 0.1″. So we think that gravity method is practical in applications.