基于多源卫星测高数据的新一代全球平均海面高模型

摘要

Based on multi-satellite altimetric data, including Geosat/GM,Geosat/ERM,ERS-1/168,ERS-2,Envisat-1, T/P and Jason-1, it is improved and re-computed their geophysical corrections by unified accurate models and methods. Then, by assuming the dataset combing theT/Pand Jason-1 measurements which arecollinear adjusted as reference, the radial orbit error and time-variation affect of sea surface height are reduced through the deve- loped whole combination crossover adjustment. Furthermore, globaIMSSHmodel named WHU2009 with the bounda- ry from -80° to 82°and resolution of 2＇×2＇ is achieved by remove-restore method and least square collocation grid method with EGM2008 high degree gravitation mode Compared with CLS01 model that commonly used internation- ally and the dataset that collinear adjusted with 2 year Jason-1 measurements, it is concluded that WHU2009 has better integrated accuracy than CLS01.%基于多源卫星测高数据，包括Geosat／GM、Geosat／ERM、ERS-1／168、ERS-2、Envisat-1、T／P和Jason-1数据，采用统一精密的模型或方法对各项地球物理改正和传播介质误差进行改进或重新计算，然后以T／P和Jason-1两种数据的共线平差作为参考基准，通过发展的全组合交叉点整体平差方法大幅度削弱了径向轨道误差和时变海面高影响。经比较后优选最小二乘配置格网化方法，以EGM2008高阶重力场模型由移去一恢复方法得到全球纬度-80°～82°范围内海域2’×2’平均海平面高模型WHU2009。与国际上较常用的CLS01平均海平面高模型及实测2年平均Jason-1比较表明WHU2009模型整体精度优于CLS01模型。