利用GEOSAT／ERM卫星测高数据计算中国近海海平面

MEAN SEA SURFACE DETERMINATION FROM GEOSAT/ERM ALTIMETER DATA IN THE CHINA SEA AND ITS VICINTTY

本文利用一年（１９８６年１１月８日～１９８７年１１月１７日）２２个ＥＲＭ周期的ＧＥＯＳＡＴ卫星测高数据计算出中国近海海域（１０５°～１３５°Ｅ，０°～４０°Ｎ）相对于ＧＲＳ８０参考椭球面的１°×１°年平均海平面。该海平面我们称之为ＩＧＧＭＳＳ９５平均海平面。在数据处理过程中，由于采用了混合轨道误差模型及交叠平差技术，极大地消除了在误差中占主要成分的径向轨道误差影响，使得ＩＧＧＭＳＳ９５平均海平面的总体精度达到±２０～３０ｃｍ（ＲＭＳ）水平。与ＯＳＵ９１Ａ重力大地水准面模型相比较可以发现两者具有惊人的一致性。

In this paper,a1°×1°year-averaged sea surface above the GRS80 reference ellipsoid,which is callled IGGMSS95 mean sea surface, has been computed from twenty-two 17-days GEOSAT altimeter data(Nov. 8, 1986-Nov, 17, 1987) in the China sea and its vicinity(0°～40°N,105°～135°E). The radial orbit error which is the largest component of the error in the altimeter data has been siginificantly reduced due to the crossover adjustment and a new hybrid model of the radial orbit error. The accuracy of the IGGMSS95 mean sea surface is 20～30cm(RMS). Comparing with the OSU91A gravitational geoid, the exactly similarity can be found.