摘要
研究了利用沿轨大地水准面梯度数据计算海洋垂线偏差的最小二乘法,首先对ENVISAT测高数据进行各项地球物理改正得到近似测高大地水准面,然后计算沿轨大地水准面的梯度,接着用最小二乘法计算格网垂线偏差东西分量和南北分量的平均值。最后,用该方法计算了南中国海区域及其邻近海域(4°N～25°N,104°E～120°E)的5′×5′垂线偏差南北分量和东西分量,其精度优于7″,并与EGM96模型计算的垂线偏差值进行了比较,证明了该方法的有效性。
Ocean vertical deflection is analyzed using ENVISAT along-track geoid gradient data by means of least square.Firstly an approximative geoid is obtained by editing ENVISAT altimeter data and geophysics correction.Then the along-track geoid gradient and the average of grid vertical deflection are calculated.Finally the vertical deflection of Chinese south sea(4°～25°N,104°～120°E)is got with resolution of 5°×5°.The accuracy is better than 7″.Its efficiency is proved by comparing it with the model of EGM96.
出处
《测绘科学》
CSCD
北大核心
2006年第5期48-49,53,共3页
Science of Surveying and Mapping
关键词
卫星测高
垂线偏差
大地水准面梯度
satellite altimetry
vertical deflection
geoid gradient
