Timeliness of Correcting Baseline Error in Wide-Swath Altimeter Based on Reference Topography Data

The baseline error is a primary source of the wide-swath altimeter, directly related to cross-track distance, and can lead serious height errors at swath’s outer edge. Cross-calibration using discrepancies with reference data effectively estimate correct error. However, building surface that accurately describes sea observation time necessary use this cross-correction method. dynamic ocean environments where structure changes over are challenging. This paper proposes method for constructing topography (RTD) based on multi-source products altimeter. effectiveness proposed evaluated HYCOM model assess timeliness correction. results demonstrate RTD altimeter significantly RMSE corrected (SSH) in different regions typically between 1~2 cm, except some strong currents approximately 3~4 cm. interval affect accuracy correction influenced by variability SSH regions. In relatively slow near equator, effective HYRTD MORTD basically reach more than 7 days. rapidly, result may no longer be reliable only 1~3