本文選題：GOCE衛(wèi)星　切入點(diǎn)：衛(wèi)星重力梯度　出處：《長安大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：GOCE衛(wèi)星采集的地球重力梯度數(shù)據(jù)是在衛(wèi)星軌道上進(jìn)行測定的，為了獲得空間固定基準(zhǔn)點(diǎn)上的重力梯度歸算值，需將不同空間點(diǎn)觀測的重力梯度歸算到同一參考基準(zhǔn)中。本文對在歸算過程中，，衛(wèi)星重力梯度的空間傳播特性，地形和大氣圈層對衛(wèi)星重力梯度觀測的影響以及重力梯度的向下延拓和格網(wǎng)化方法進(jìn)行了分析研究。 取得了以下主要研究成果： 1)利用C++編制了基于多種參考框架的衛(wèi)星重力梯度模擬軟件，并在頻譜域中分析了重力梯度的傳播特征，結(jié)果表明：隨著觀測高度的增加，不同重力梯度分量的中高頻部分急劇衰減，低頻部分衰退相對緩慢。 2)基于球諧函數(shù)，推導(dǎo)了地形、大氣圈層對衛(wèi)星重力梯度的影響效應(yīng)，并利用ETOPO30全球地形模型分別模擬了亞洲地區(qū)上空的地形和大氣效應(yīng)，通過實(shí)驗(yàn)發(fā)現(xiàn)：地形對GOCE衛(wèi)星重力梯度觀測的影響為-5.164~6.693E，大氣對GOCE衛(wèi)星重力梯度的影響為-3.8~3.0E。 3)分析了幾種常用的重力梯度延拓和格網(wǎng)化方法，并進(jìn)行了實(shí)驗(yàn)計(jì)算。結(jié)果顯示：在向下延拓過程中，頻域最小二乘法的精度最高，泰勒級(jí)數(shù)法的精度次之；在格網(wǎng)化方法中，Shepard法的精度相對較高，加權(quán)平均法的精度相對較低。 4)利用近十年的GRACE時(shí)變重力場計(jì)算了日本地震區(qū)域上空250km的重力梯度，該結(jié)果能較好的反映日本9.0級(jí)地震的重力梯度過程。
[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.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P223;P315.726

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本文編號(hào)：1648884