纯球坐标系内各项重力校正值计算方案和计算过程  

THE COMPUTATION SCHEME AND COMPUTATION PROCESS FOR GRAVITY CORRECTION VALUES WITHIN THE PURE SPHERICAL COORDINATE SYSTEM

作　　者：安玉林[1] 张明华[2] 黄金明[2] 乔计花[2] 

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]中国地质调查局发展研究中心,北京100037

出　　处：《物探与化探》2010年第6期697-705,共9页Geophysical and Geochemical Exploration

基　　金：国家油气专项"青藏高原油气资源战略选区调查与评价"中;中国地质调查局发展研究中心2006年承担的"青藏高原比如;可可西里盆地重力资料处理"子专题的研究成果

摘　　要：在国内,首次阐述了"纯球坐标系内各项重力校正值的计算方案和计算过程"。该计算方案有如下优点:①以观测点P为中心,以球面距离am=am-1+Δa.bm-1(m=2,3,…,M)为半径将计算区划分为M个环带,再以Δλ0为由P点出发射线的角度间隔将所有环带等分为N(整数)份的计算区划分方案是最严密拼接,因而校正值的计算精度相当高。②在地形复杂和相对高差大的情况下,通过减小Δa、b和Δλ0数值,可进一步提高计算精度。③可以直接采用带有经、纬度坐标的高程数据,进行大面积测区的各项重力校正值计算,而不受6°带和标准图幅限制。The computation project and computation process for gravity correction values within the pure spherical coordinate system are expounded for the first time in this paper.All important formulae in the scheme are educed separately by the authors.The excellences of this computing scheme are as follows： ① By using observational point P as the center of the computation region and by using spherical surface distances am=am-1＋Δa·b^m-1（m=2,3,…,M） as the radius,the computation region is plotted out as M girdles.Then,By using Δλ0 as the angle interval of radials from P point,all girdles are plotted out as integral N parts.This scheme for plotting out the computation region is extremely precise and its computation precision is very high.② Under the condition of complex terrain and remarkable different altitudes,the computation precision can be improved by minimizing values of Δa,b and Δλ0.③ The gravity correction values of very large surveying area will not be confined by the 6° cingulum and the standard map sheet and can directly be computed by using altitude values with longitude and latitude.

关 键 词：球坐标系 重力校正值 计算方案和计算过程 

分 类 号：P631.1[天文地球—地质矿产勘探]