摘要
联合多种测高资料,基于EIGEN_CG01C重力场模型,采用沿轨迹加权最小二乘方法确定了中国边缘海和全球海域格网垂线偏差(IGG2006_DOV),中国海域整体精度优于1.2″,满足了反演高分辨率、高精度海洋重力场对测高垂线偏差的精度要求。在南海海域,基于测高垂线偏差解算的重力异常与船测重力进行了外部检核,精度达到7.75 mGal。
On the basis of gravity field model（EIGEN_CG01C）,together with multi-altimeter data,the improved deflection of the vertical gridded in 2′×2′ in China marginal sea and gridded in 5′×5′ in the global sea are determined using the weighted method of along-track least squares,and the accuracy is better than 1.2″ in China marginal sea.As for the quality of the deflection of the vertical,it meets the challenge for the gravity field of high resolution and accuracy.It shows that,compared with the shipboard gravimetry in the sea,the accuracy of the gravity anomalies computed with the marine deflection of the vertical by inverse Vening-Meinesz formula is 7.75 mGal.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2007年第9期770-773,共4页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(40474030
40674013)
关键词
卫星测高
沿轨迹
加权最小二乘
垂线偏差
altimetry
along-track
the weighted least-squares
deflection of the vertical
