地球参考框架ITRF2008在中国大地基准中的应用

APPLICATION OF ITRF2008 IN CHINA GEOID DATUM

利用国际地球参考框架ITRF2008及中国大陆连续基准站数据,分析了ITRF2008与ITRF2005及CGCS2000的差异,得出ITRF2008比早期的模型精度更高,但也存在着一定的差异性,这与观测台站、板块本身,数据解算策略等因素有关;中国地壳板块运动的不均匀性和复杂性造成了CGCS2000的变化,需对其进行动态维护。同时对CGCS2000与ITRF2008之间转换的方案也作了初步讨论。

Taking the data of China geoid datum in consecutive days, as an example, the latest International Terrestrial Reference Frame （ITRF2008） was used to analyzed the difference between ITRF2008 , ITRF2005 and CGCS2000. It is valuble maintaince to China geoid datum. It is concluded that the ITRF2008 more precise than the previous ITRF models, but there are some differences, which is related with observation stations, plate, the strate- gy for data solving and other factors. The nonuniforming and complexity of the earth plate movements cause the CGCS2000＇ s changes which should be dynamiely maintained. In the same time, the transformation scheme between CGCS2000 and ITRF2008 is preliminarily described.