海洋重力大地水准面的确定

美国海洋卫星测高仪的出现,使应用Hotine积分确定海洋大地水准面成为现实。本文通过对Hotine积分及垂线偏差的计算公式进行改进,较好地改善了求和项的收敛性,减小了截断误差影响,并提出了利用Hotine函数和重力异常确定海洋大地水准面的方法。 实际计算表明:海洋重力大地水准面的精度在1米以内;卫星测高大地水准面间存在0.5米系统差;它和海底地形有一定的相关性,能较好地反映出海底地形的宏观特性。

The Determination of Oceanic Geoid

In this paper, the formulas for computing geoid undulation and vertical deflection are modified by some special techniques. It has obviously quickened the convergence speedof the summation terms, and decreased the truncation error. A new method for deter-ming oceanic geoid from gravity anomaly using Hotine function has been worked out. The accuracy of geoid undulation computed in this paper is better than 1 meter;systematic differences between seasat geoid and oceanic geoid are at the half-meter level. From the geoid charts some correlation of the oceanic geoid with ocean bottom to-pography has been shown, that the main characteric of the oceanic topography can berepresented by the oceanic geoid.