EGM2008、EGM96、DQM2006三种地球重力场模型的比较分析  

Comparative Analysis of Three Earth Gravity Field Models - EGM2008, EGM96 and DQM2006

作　　者：翟振和[1,2,3,4] 李迎春[2,3] 王兴涛[2,3] 

机构地区：[1]宇航动力学国家重点实验室,陕西西安710043 [2]地理信息工程国家重点实验室,陕西西安710054 [3]西安测绘研究所,陕西西安710054 [4]信息工程大学地理空间信息学院,河南郑州450052

出　　处：《测绘科学与工程》2013年第3期36-38,74,共4页Geomatics Science and Engineering

基　　金：国家自然科学基金资助项目（41174017）,宇航动力学国家重点实验室开放基金资助项目（2013ADb-DW0103）.

摘　　要：利用EGM2008、EGM96、DQM2006三个重力场模型计算了我国局部地区的30’平均重力异常、904个实测点的高程异常以及全国884个天文点的垂线偏差，并同时对计算大地水准面进行了比较分析。结果表明：在相同阶次条件下，DQM2006获得的模型重力异常方面优于EGM2008、EGM96，对于30’格网重力异常精度达到8．1×10^-5m／s^2；在计算高程异常方面，EGM2008与DQM2006精度相当，两者与EGM96相比精度提高了2倍；在计算垂线偏差方面，EGM2008和DQM2006优于EGM96，两者精度基本一致；在计算大地水准面方面，EGM2008和DQM2006得到的结果都优于EGM96，且两者精度相当。Based on the three gravity field models EGM2008, EGM96 and DQM2006, the paper calculates mean gravity anamoly, height anomaly of 904 measured points in some regions of China and vertical deflections of 884 observation stations of China. Meanwhile, it makes a comparative analysis of the quasi - geoid determination. The results show that the gravity anomaly of DQM2006 model is better than that of EGM2008 and EGM96 under the same degree and order, and the gravity anomaly accuracy of the 30＂grid is about 8.1×10^-5m/s^2 ; the accuracies of EGM2008 and DQM2006 are nearly the same in terms of height anoma- ly, which increases 2 times compared with that of EGM96 ; the accuracies of EGM2008 and DQM2006 are basically the same in terms of vertical deflection, and they are superior to that of EGM96 ; the accuracies of EGM2008 and DQM2006 are almost the same in terms of quasi - geoid determination, and they are better than that of EGM96.

关 键 词：EGM2008 EGM96 DQM2006 重力异常 高程异常 垂线偏差 

分 类 号：P228.3[天文地球—大地测量学与测量工程]