CORS系统在重力调查中的应用  

THE APPLICATION RESEARTH OF CORS TO GRAVITY PROSPECTING

作　　者：滕龙[1,2] 倪四道[1,3] 张宝松[2] 邸兵叶[2] 朱红兵[2] 殷启春[2] 高卫华[2] 

机构地区：[1]中国科学技术大学地球与空间科学学院,安徽合肥230026 [2]中国地质调查局南京地质调查中心,江苏南京210016 [3]中国科学院,湖北武汉430077 [4]大地测量与地球物理研究所大地测量与地球动力国家重点实验室

出　　处：《物探与化探》2013年第6期1018-1022,共5页Geophysical and Geochemical Exploration

基　　金：中国地质调查局计划项目(基1212011087041)

摘　　要：目前重力勘探主要采用RTK模式进行测点定位,但RTK需要架设基站,且随着流动站与基准站之间距离的增加,精度逐渐降低。CORS系统能快速获得高精度的WGS84三维坐标,不需要架设基准站,弥补了RTK测量模式的不足。CORS系统已经广泛应用于测绘、国土、水利、地质灾害等领域,但尚未在应用到重力勘探中。笔者首先论述了CORS在重力勘探中的应用优势;然后探讨如何将CORS成果转换为高精度的三维国家或地方坐标的方法。通过在江苏1∶5万重力调查中进行检核,平面精度优于1 cm,似大地水准面精化高程精度最差为5.2 cm,完全满足勘探精度要求。Gravity prospeting method has been one of the best way to solve geological problems. The efficiency of gravity point positioning affect the overall efficiency of the work progress,and the elevation accuracy determines the accuracy of the calculation of the gravity data processing. GPS,which can quickly obtain high-precision three-dimensional coordinates,accelerate the progress of the gravity prospecting method and improve work efficiency. RTK is the main method for gravity prospecting. But that need to set up the base station,and the further between the mobile stations and the base station,the worse of the accuracy. CORS makes up for the lack of RTK,because it can quickly survey high-precision coordinates of the WGS84 three-dimensional do not need to set up the station. The CORS system has been widely used in the fields of mapping,land,water,geological disasters,but not yet applied to the exploration of gravity. In this paper,the advantages of CORS will be discussed at first,then how to convert the results of the CORS to local coordinate system will be presented. By applying in Jiangsu 1∶ 50 000 gravity survey,the plane accuracy is better than 1 cm,and refined quasi-geoid height accuracy is better than 5. 2 cm. The accuracy meets the requirements of gravity prospecting.

关 键 词：重力勘探 CORS 坐标转换 似大地水准面精化 

分 类 号：P631.1[天文地球—地质矿产勘探]