顾及地形、大气影响的GOCE卫星SGG数据到参考基准的归算研究

发布时间：2018-03-22 13:37

本文选题：GOCE卫星　切入点：卫星重力梯度　出处：《长安大学》2013年硕士论文　论文类型：学位论文

【摘要】：GOCE卫星采集的地球重力梯度数据是在卫星轨道上进行测定的，为了获得空间固定基准点上的重力梯度归算值，需将不同空间点观测的重力梯度归算到同一参考基准中。本文对在归算过程中，，卫星重力梯度的空间传播特性，地形和大气圈层对卫星重力梯度观测的影响以及重力梯度的向下延拓和格网化方法进行了分析研究。取得了以下主要研究成果： 1)利用C++编制了基于多种参考框架的卫星重力梯度模拟软件，并在频谱域中分析了重力梯度的传播特征，结果表明：随着观测高度的增加，不同重力梯度分量的中高频部分急剧衰减，低频部分衰退相对缓慢。 2)基于球谐函数，推导了地形、大气圈层对卫星重力梯度的影响效应，并利用ETOPO30全球地形模型分别模拟了亚洲地区上空的地形和大气效应，通过实验发现：地形对GOCE卫星重力梯度观测的影响为-5.164~6.693E，大气对GOCE卫星重力梯度的影响为-3.8~3.0E。 3)分析了几种常用的重力梯度延拓和格网化方法，并进行了实验计算。结果显示：在向下延拓过程中，频域最小二乘法的精度最高，泰勒级数法的精度次之；在格网化方法中，Shepard法的精度相对较高，加权平均法的精度相对较低。 4)利用近十年的GRACE时变重力场计算了日本地震区域上空250km的重力梯度，该结果能较好的反映日本9.0级地震的重力梯度过程。
[Abstract]:The earth's gravity gradient satellite GOCE data acquisition is determined in the satellite orbit, in order to obtain the gravity gradient space fixed reference point on the imputation of values, the gravity gradient observations of different space points to calculate the same reference. In this paper, in the reduction process, the spatial propagation characteristics of the satellite gravity gradient the influence of terrain and atmosphere, circle of satellite gravity gradient observations and the downward continuation of gravity gradient and gridding methods are analyzed.
The following main research results have been obtained:
1) developed simulation software of satellite gravity gradient multiple reference frame based on C++, and in the frequency domain analysis of the propagation characteristics of the gravity gradient, the results show that with the increase of the height of observation, in the high frequency part of different gravity gradient component decays rapidly, the low-frequency part of the recession is relatively slow.
2) spherical harmonic function is deduced based on the terrain, the effect of air circle effect on satellite gravity gradient, and the use of ETOPO30 global terrain topography and atmospheric effects over Asia were simulated. Experiments show the influence of topography on GOCE satellite gravity gradient observations for -5.164~6.693E, atmospheric effects on GOCE satellite gravity gradient is -3.8~3.0E.
3) analysis of the gravity gradient of several commonly used continuation and gridding methods, and experimental calculation. The results show that: in the downward continuation process, the frequency domain least square method of the highest accuracy, the accuracy of time Taylor series method; in grid method, the precision of Shepard method is relatively high, the weighted average method the accuracy is relatively low.
4) the gravity gradient of 250km over Japan's earthquake area has been calculated using the GRACE time-varying gravity field in recent ten years, which can better reflect the gravity gradient process of Japan's 9 magnitude earthquake.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P223;P315.726

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