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29 March 2024 |
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The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft | G. Ruffini
; F. Soulat
; M. Caparrini
; O. Germain
; M. Martin-Neira
; | Date: |
7 Jun 2004 | Subject: | Atmospheric and Oceanic Physics; Instrumentation and Detectors | physics.ao-ph physics.ins-det | Affiliation: | Starlab) and M. Martin-Neira (ESA/ESTEC | Abstract: | During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy. Wind speed (U10) was around 10 m/s, and SWH up to 2 m. A geophysical parametric waveform model was used for retracking and estimation of the lapse between the direct and reflected signals with a 1-second precision of 3 m. The lapse was used to estimate the SSH along the track using a differential model. The RMS error of the 20 km averaged GNSS-R absolute altimetric solution with respect to Jason-1 SSH and a GPS buoy measurement was of 10 cm, with a 2 cm mean difference. Multipath and retracking parameter sensitivity due to the low altitude are suspected to have degraded accuracy. This result provides an important milestone on the road to a GNSS-R mesoscale altimetry space mission. | Source: | arXiv, physics/0406025 | Services: | Forum | Review | PDF | Favorites |
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