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29 March 2024
 
  » arxiv » physics/0406025

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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
AffiliationStarlab) and M. Martin-Neira (ESA/ESTEC
AbstractDuring 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
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