天体测量技术及应用研究组知识库

The classic astrometric instruments can measure the local astronomical longitude and latitude by using plumb line as a reference, where the variation of local plumb line can be gotten. The deflection of the local plumb line implies the change of the gravitational field around the station. It is often related to the redistribution of subsurface matter, and could be helpful for knowing the situation of underground materials. A dual-mass model is developed to find the relationship between local PLV (Plumb Line Variation) and subsurface mass change. 3480 sets of cases are considered which containing positive and negative mass variations (relative to the geological background) in the range of 97◦E–107◦E (E denotes east longitude) and 21◦N–29◦N (N denotes north latitude). The relevant problem is solved by the DE (Differential Evolutionary) algorithm. The resulting error of position is about 1 meter and error of mass is less than 1011 kg, which are improved in comparison to the previous treatments. 

经典天体测量仪器以铅垂线为基准测量本地的天文经纬度,因而能探测到本地铅垂线的偏转.本地铅垂线的偏转代表着测站周围重力场的变化,而这一变化与地下物质的再分布相关,由此有望帮助了解地下物质变化的情况.将本地的铅垂线偏转（Plumb Line Variation, PLV）与地下物质变化联系起来,建立了双质量体模型.在97°E–107°E和21°N–29°N范围内,考虑了3480个包含正、负质量变化（相对地质背景）的质量体组合算例,并利用差分进化（Differential Evolutionary, DE）算法进行了解算.解算得到的质量体相对于模拟值的位置误差小于米量级,质量误差小于1011kg,结果精度较高.