| Interferometric Path Models for GNSS Ground-Based Phase Altimetry |
| Paper ID : 1313-SMPR |
| Authors: |
|
Saman Khajeh *1, Alireza Azmoodeh ardalan2, Harald Schuh3 1Abiarri - allay 22- fifth door on right 2School of Surveying and Geospatial engineering, Faculty of Engineering, University of Tehran, Iran. 31. Institute of Geodesy and Geoinformation Sciences, Technical University of Berlin, Germany 2. German Research Centre for Geosciences GFZ, Potsdam, Germany |
| Abstract: |
| Altimetry by using GNSS (Egido, Caparrini et al.) reflectometry is regarded as a new promising technique. One important step to utilize this technique is modeling the interferometric path. This paper evaluates three models: the planar model, the planar model with tropospheric correction and a model based on ray-tracing. If decimeter level accuracy for water surface fluctuation is required the planar model cannot be used if a receiver is at an altitude of a few hundred meters and observations are taken between the elevation angles of 5-15°. On the other hand, depending on the mapping function and zenith total delay in the tropospheric correction, the planar model with tropospheric correction can provide decimeter level accuracy for low altitude stations. If simulated observations with a 1 cm accuracy have been employed to estimate Sea Surface Height (SSH) by ray-tracing the numerical results present 1 cm as RMSE for phase retrieval and 5 cm for Doppler retrieval. The planar model with tropospheric correction does not yield RMSE better than some decimeters for the same condition. |
| Keywords: |
| GNSS, Reflectometry, Altimetry, Planar Model, Tropospheric Correction, Ray-Tracing. |
| Status : Conditional Accept (Oral Presentation) |
