柴达木盆地冷湖地区大地水准面模拟精化计算

根据青海石油局物探处在柴达木冷湖昆特依地区进行ＧＰＳ定位提供的高程信息，对该区大地水准面做了模拟精化计算分析，结果表明：该地区大地水准面起伏明显，南北向如ＬＨ３７—ＬＨ２４两点距为４３．４ｋｍ，高程异常值之差为０．７５ｍ，且由北向南逐渐降低；东西向如Ｓ２０５—ＧＢＧ０两点距离为２６ｋｍ，高程异常值之差为１．６２ｍ，由西向东逐渐抬高．在获得准确的高程异常情况下，就可得到精度较高的ＧＰＳ高程．同时也说明了用ＧＰＳ高程代替部分水准测量工作是可行的，这就为柴达木盆地大地水准面精化指出了研究方向．用ＧＰＳ精化大地水准是获取精密的大地水准面起伏的一种有效的方法，对地球物理及地球力场模型的建立等科研工作有着重要的意义

Simulated and Accurate Computation of the Geoid in Lenghu Area of Chaidamu Basin,Qinghai Province

Based on the elevation information obtained from GPS survey in kunteyi area of Lenghu,Chaidamu Basin,the authors made simulated and accurate computation and analysis of the geoid of the region and got significant results.The results show that the geoid undulates distinctively,e.g. the difference of abnormal elevation values between two south north going points(LH37 LH24) is 0.75m with their distance being 43.4km and it is getting lower from the north to the south;and the difference of abnormal elevation values of another east west going points(S205 GBGO) is 1.62m with their distance being 26km and it is getting higher from the west to the east. With accurate abnormal elevation value,the GBS elevation with higher accuracy can be obtained,which proves that the survey of GBS elevation can be used to replace part of level surveying work.It points out the direction for obtaining accurate geoid of Chaidamu Basin.