基于重力异常分析的重力梯度图制备方法

Modeling full-tensor gravity gradient maps using gravity anomaly analysis

针对水下自主导航中重力场匹配导航的需要,提出了一种基于重力异常分析的制备全张量重力梯度图的方法.分析了实际测量中引起重力异常的各种因素,并提出以全球重力场模型推算地下剩余质量和测点纬度引起的重力异常,加上用数字高程模型推算地形起伏及布格板引起的重力异常,在此基础上制备较高分辨率的局部全张量重力梯度数字地图.仿真实验及与实测数据的对比分析表明,所得全张量重力梯度基准图的特性与实测数据基本符合.与其他方法的对比发现,该方法是一种更准确有效的制备全张量重力梯度基准图的方法,所制备的重力梯度图更符合实测数据的特性.

A novel method of modelling full tensor graity gradient maps based on gravity anomaly anal ysis was presented, for the requirement of current gravity matching navigation. Analysing the factors by which gravity anomalies were arised in actual measurements, gravity anomalies caused by underground density contrast and latitude could be calculated by global geopotential model, and anomalies caused by terrain and bouguer plate could be calculated by digital elevation model. Accordingly high-resolution full-tensor gravity gradient maps were gained. The simulation tests and the contrast between the maps and the actual data illuminate that the both were ultimately accord with each other, thus the method presented is more effective and exact on modelling full tensor gravity gradient maps contrast to other methods, a lot of detail and texture in the maps appears better applicative potential in navigation.