利用多代卫星测高数据反演海洋重力场

Recovery of marine gravity field using integrated data from multi-satellite missions

为了解决多代卫星测高数据之间的不协调性问题,本文基于误差验后补偿理论,提出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。在此基础上,本文利用多代卫星测高数据联合平差获得的结果,进一步反演了中国海及其邻域地区的重力异常,并将计算结果同海面船测数据作了比对,实际算例已经证明了新方法的有效性。

In order to eliminate the inconsistency of the existing data from multi-satellite missions,we propose a new method for optimal combination of the altimeter data.In our data management system,the crossover adjustment is modified to a two steps processing based on the a 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.With the new approach,the solution procedure of crossover adjustment can be simplified greatly,and the stability and reliability of its computation results can be expected.The new method can be used to resolve both local and global crossover adjustment problems.Finally,a practical altimeter data set from Geosat,ERS-1,ERS-2 and TOPEX/POSEIDON(T/P) over the regional area of and is used as a case study to prove the efficiency of the integrated data processing method.