重力梯度仪测量数据误差分析及其滤波处理

Error analysis and filter processing of high accuracy and resolution gravity gradiometer in dynamic environment have been the key for our country to obtain the results gradient data used for geological interpretation. However, removing the high-frequency noise from the high-frequency real gradient data by combining multiple gradient components is one of the most challenging tasks associated with combining multiple gradient component. Therefore, in this project, we will first analyze the errors of gravity gradiometer, stabilized platform, GPS position and the cross-coupled error of these factors with the true gravity gradient anomalies in survey. Secondly, we will estimate the error characteristic of each gravity gradient tensor and build an inversion filter equation of a gravity gradient tensor component by using the Fourier series in three-dimension sample points. Finally, we will establish a joint inversion filter equation in view of direction weight, which can highlight the advantage of different components to improve the accuracy and resolution of result data. This research carried out in our project will establish an error characteristic analysis and a joint inversion filtering system for the gravity gradient tensor data, which will provide theoretical and technical support for the domestic gravity gradiometer test under dynamic environment and processing method of those dynamic measured data.

高精度、高分辨率重力梯度仪在动态环境下的测量误差分析及其滤波处理成为我国自主获取可用于地质解释的成果梯度数据的关键，联合多个梯度分量去除高频噪声的同时保留有效的高频梯度信号将是一个挑战。本项目拟首先全面分析重力梯度仪、稳定平台、GPS导航定位等在动态环境下的测量误差及其与测区内真实重力梯度异常值之间的交叉耦合误差，并对各梯度分量测量误差进行统计分析；其次，根据误差特性建立重力梯度单分量在三维空间离散测量点的傅里叶级数反演滤波方法；最后建立基于方向加权的重力梯度张量多分量联合反演滤波方法，发挥不同分量的方向优势，显著提高成果数据的精度和分辨率。本项目最终建立一套健全的重力梯度仪测量数据的误差特性分析及联合反演滤波系统，为国内自主研发重力梯度仪能尽早开展动态环境试验和测量数据处理提供技术支撑和方法积累。

高精度、高分辨率重力梯度仪在动态环境下的测量误差分析及其滤波处理成为我国自主获取可用于地质解释的成果梯度数据的关键，联合多个梯度分量去除高频噪声的同时保留有效的高频梯度信号将是一个挑战。本项目拟首先全面分析重力梯度仪、稳定平台、GPS导航定位等在动态环境下的测量误差及其与测区内真实重力梯度异常值之间的交叉耦合误差，并对各梯度分量测量误差进行统计分析；其次，根据误差特性建立重力梯度单分量在三维空间离散测量点的傅里叶级数反演滤波方法；最后建立基于方向加权的重力梯度张量多分量联合反演滤波方法，发挥不同分量的方向优势，显著提高成果数据的精度和分辨率。本项目最终建立一套健全的重力梯度仪测量数据的误差特性分析及联合反演滤波系统，为国内自主研发重力梯度仪能尽早开展动态环境试验和测量数据处理提供技术支撑和方法积累。