Knowledge Resource Center for Ecological Environment in Arid Area
利用航空重力数据确定局部大地水准面 | |
其他题名 | Local Geoid Determination From Airborne Gravity Data |
卢雪盈 | |
出版年 | 2015 |
学位类型 | 硕士 |
导师 | 柳林涛 |
学位授予单位 | 中国科学院大学 |
中文摘要 | 航空重力测量是一种以飞机为载体,应用重力仪(或加速度计)测定近地空中重力加速度的测量技术。与传统地面重力测量相比,它不受地形的限制,能够在山区、沙漠以及海洋、陆海交界等难以开展地面重力测量的区域快速经济地获取高精度、大面积、高分辨率(100km-80km)、一致性好的重力场数据,可以满足大地测量学、地球动力学、资源勘探等学科及领域的需求。目前我国航空重力测量尚处于起步阶段,对其理论、方法及应用的研究与国外有很大差距,本文在国内外研究的基础上,对航空重力向下延拓和大地水准面的确定进行研究,主要工作总结如下: 1、推导了航空重力测量的数学模型,各项扰动改正以及测线点重力异常的计算公式,并简要叙述了航空重力测量数据的处理流程。 2、推导了用于航空重力数据延拓的泊松积分公式,通过向上延拓评定航空重力数据的精度。基于逆泊松积分应用快速傅里叶变换算法和迭代法求解重力异常,进行向下延拓,通过对延拓结果和地面实测数据的比较分析,客观评价延拓方法的精度,并讨论了在向下延拓算法中引入的低通滤波器的选择。实验结果表明快速傅里叶变换算法的结果较好。 3、详细介绍了用于确定大地水准面的斯托克斯法和移去-恢复法的理论。为验证地形的影响,选用地形起伏较大的区域重力数据进行计算,向下延拓计算中采用最小二乘配置法,将延拓后的数据按照斯托克斯方法计算大地水准面,与地面重力数据计算得到的大地水准面相比,其精度为4.7cm。 |
英文摘要 | Airborne gravimetry is a tool for surveying the airborne gravity data using aircraft and gravimeter(or accelerometer). Compared with traditional ground gravity survey, it is possible to obtain high-precision, large-area, high-resolution (100km-80km), good consistency of gravity field data such as in the mountains, deserts, oceans, areas mixed with land and ocean and other complicated terrains quickly and economically to meet the need of geodesy, geodynamics, resource exploration and other disciplines and areas. At present, Domestic airborne gravimetry is still at the initial stage. There is a big gap in theories, methods and applications compare to abroad. In this thesis, we study the methods of downward continuation and geoid determination. The main work presents as follows: 1、The mathematical model of airborne gravimetry, the formulas of corrections and gravity anomalies of survey lines is derived and the process of airborne gravity data processing is clarified. 2、The formula of Poisson integral which used for continuation of airborne gravity anomaly and assesses the accuracy of airborne gravity data is derived. The downward continuation of airborne gravity data is performed by FFT and iterative methods. The accuracy is evaluated based on the comparison and analysis of downward continued result with terrestrial real gravity data. The choice of low-pass filters for downward continuation is also discussed. The experiment showed that the FFT method can obtain a better result compared with those derived from iterative method. 3、The theories of Stokes integral, Remove-Restore method are derived. We choose an undulating area to study. The downward continuation is performed by Least-square collocation. The geoid determination is performed by Stokes integral and the accuracy is 4.7cm compared with the model which is computed by ground gravity data. |
中文关键词 | 航空重力测量 ; 向下延拓 ; 逆泊松积分 ; 大地水准面 ; 斯托克斯积分 ; 移去-恢复法 |
英文关键词 | Airborne Gravimetry Downward continuation Inverse Poisson Integral Geoid Stokes Integral Remove-Restore Method |
语种 | 中文 |
国家 | 中国 |
来源学科分类 | 大地测量学与测量工程 |
来源机构 | 中国科学院测量与地球物理研究所 |
资源类型 | 学位论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287470 |
推荐引用方式 GB/T 7714 | 卢雪盈. 利用航空重力数据确定局部大地水准面[D]. 中国科学院大学,2015. |
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