| This paper is based on the HY-2 and Jason-2 satellite observation data, using the improved latitude difference method to find the location of the crossover points, and the relevant data processing. The main contents of the paper are as follows:Firstly, this paper studies the exact location of the crossover points of satellite ground trajectories based on the latitude difference method. In view of the virtual crossover points problem, an improved latitude difference method is proposed. The method is compared with the quadratic fitting method and the manually segmented fitting method, and the method is validated from three aspects of HY-2 and Jason-2 satellite ground trajectories self-crossover points and co-crossover points. The results show that the improved lati-tude difference method has the characteristics of accuracy, reliability, versatility and high degree of automation.Secondly, based on the improved latitude difference method, the two satellites self-crossover points and co-crossover points are obtained respectively, and the inverse distance weighting method is used to find some data parameters at the crossover points. On the basis of time and space matching, the data are compared and analyzed, which shows that the observation data of two satellite altimeters are consistent.Finally, the correction of the sea surface height is corrected, and the error model in the posterior adjustment method is improved according to the imperfection of the error model in the adjustment process. The results show that the posterior adjustment precision is far superior to the conditional adjustment (Linear model), and it is equivalent to the method of traditional rank defect network adjustment. However, the method does not have the problem of matrix rank loss, and the calculation process is simple and the stability of the result is improved. Therefore, the posterior adjustment is more suitable for dealing with global crossover point data. |
PDF Full Text Request