利用FG5绝对重力仪观测数据确定重力垂直梯度  

Determining vertical gradients of gravity by observations of the FG5 absolute gravimeter

作　　者：宛家宽 罗志才 赵珞成[1] 

机构地区：[1]武汉大学测绘学院,武汉430079 [2]华中科技大学物理学院,武汉430074 [3]华中科技大学地球物理研究所,武汉430074 [4]武汉大学地球空间环境与大地测量教育部重点实验室,武汉430079

出　　处：《地球物理学报》2018年第1期119-126,共8页Chinese Journal of Geophysics

基　　金：国家重大科学仪器设备开发专项(2012YQ10022507);国家自然科学基金项目(41374023)联合资助

摘　　要：本文建立了利用FG5实测数据求解重力垂直梯度的数据处理模型与算法.通过对多次自由落体实验的下落距离拟合残差叠加求均值,发现下落距离观测量中存在明显的有色噪声.通过对有色噪声的建模,并以剩余残差为依据选取可靠的下落时段,解算测站点的重力垂直梯度.利用本文所提出的数据处理方法分别对FG5-214绝对重力仪在两个测站上的观测数据进行处理,以相对重力仪测量的重力垂直梯度结果为参考值,本文处理得到的重力垂直梯度结果相比于未考虑有色噪声并依据经验选取下落时段的解算方法得到了显著改善.A method for determining vertical gradients of gravity by observations of the FG5 absolute gravimeter is presented in this paper. The vertical gradients are compared with that from high-accuracy relative gravimeters. The colored noises in the observations are detected in the distance residuals stacked from numbers of free-fall drop experiments. A new algorithm is proposed to solve vertical gradients of gravity by modeling the colored noises and choosing a fitted period of drop time based on the model residuals. This method has been used to process observations derived from the FG5-214 instrument at two stations. And the results from this approach are much better than that calculated by the existing methods, in which no consideration of the colored noises is taken and the period of drop time is chosen according to experiences.

关 键 词：绝对重力测量 FG5绝对重力仪 有色噪声 重力垂直梯度 下落时段 

分 类 号：P312[天文地球—固体地球物理学]