COMPARISON BETWEEN GROUND-RANGE VELOCITY COMPONENT OF OCEAN CURRENT BY ALONG-TRACK SAR INTERFEROMETRY AND CURRENT VELOCITY MODEL

Abstract

Along-track Interferometry (ATI) Synthetic Aperture Radar (SAR) has been used to detect moving targets such as ships and vehicles as well as to calculate velocity vector of ocean currents and waves. The TerraSAR-X Dual Receive Antenna (DRA) mode is a mode for receiving signals respectively by separating one antenna receiver into two. With DRA mode, it is possible to generate the phase interferogram and to calculate the range velocity component, which is perpendicular to the direction of the satellite, using these interferometric phases. In the present paper, the ground-range velocity components of ocean currents in Hangzhou are calculated through ATI of TerraSAR-X DRA mode SAR images, which has 26.3m spatial resolution and compared with current velocity model data, which has 3km spatial resolution. As a result, the current velocity from MOHID model showed a stronger tendency than the velocity calculated by ATI with 0.37m/s RMSE. Based on these results, it is expected that it is possible to calculate the surface current velocity with high resolution and accuracy by interpolating the MOHID model with high accuracy and the SAR ATI with high resolution. mode is a mode for receiving signals respectively by separating one antenna receiver into two. With DRA mode, it is possible to generate the phase interferogram and to calculate the range velocity component, which is perpendicular to the direction of the satellite, using these interferometric phases. In the present paper, the ground-range velocity components of ocean currents in Hangzhou are calculated through ATI of TerraSAR-X DRA mode SAR images, which has 26.3m spatial resolution and compared with current velocity model data, which has 3km spatial resolution. As a result, the current velocity from MOHID model showed a stronger tendency than the velocity calculated by ATI with 0.37m/s RMSE. Based on these results, it is expected that it is possible to calculate the surface current velocity with high resolution and accuracy by interpolating the MOHID model with high accuracy and the SAR ATI with high resolution.