Calculation and Analysis of the Deflection of Vertical Derived from Cryosat and Jason1 GM Data

Satellite altimetry data with different spatial and temporal resolution has different effects on calculation of the deflection of vertical, thus the Jason1 waveform data and Cryosat data are combined. After the preprocessing of waveform retracking and the time-varying effect weakened, the deflection of vertical components at three different typical areas are obtained based on the Sandwell method and the weighted least squares method, respectively. The results were compared with the EGM2008 model value showing that the Jason1 data of geodetic mission with a lower orbital inclination can improve the accuracy of the east-west component of vertical deflection and combination of Cryosat data with higher orbital inclination can obtain a better result. In addition, the remove-restore method with a gravity field model as a reference field, can bring a further improvement in the computing accuracy.