多代卫星测高数据联合平差及重力场反演

为了解决多代卫星测高数据之间的不协调问题,基于误差验后补偿理论,提出了将传统的交叉点平差整体解法简化为两步处理法,即首先使用条件平差法对交叉点观测方程进行平差计算,然后沿测高轨迹进行海面高滤波和推估。使用新方法可大大简化联合平差的计算过程,且有利于提高计算结果的稳定性和可靠性,对规则和不规则的区域网和全球网交叉点平差问题都同样适用。实际算例证明了新方法的有效性。

Integrated Data Processing for Multi-satellite Missions and Recovery of Marine Gravity Field

In order to eliminate the inconsistency of the existing data from multi-satellite missions,a new method is proposed for optimal combination of the altimeter data.In the data management system,the crossover adjustment is modified to a two-step processing based on the posteriori compensation theory of error,i.e.the crossover adjustment of condition equations is made in the first step,and the filtering and prediction of adjustment corrections done along each single pass in the second step.Using the new approach can simplify the solution procedure of crossover adjustment greatly,and the stability and reliability of its computation results can be expected.The new method can be used to both local and global crossover adjustment problem.Finally,practical altimeter data set from Geosat,ERS-1,ERS-2 and T/P is used as a case study to prove the efficiency of the integrated data processing method.