dorsal/arxiv
View SchemaThe Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft
| Authors | G. Ruffini, F. Soulat, M. Caparrini, O. Germain, M. Martin-Neira |
|---|---|
| Categories | |
| ArXiv ID | physics/0406025 |
| URL | https://arxiv.org/abs/physics/0406025 |
| DOI | 10.1029/2004GL019994 |
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.
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"abstract": "During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km\naltitude to collect L1 signals and their reflections from the sea surface for\nassessment of altimetric precision and accuracy. Wind speed (U10) was around 10\nm/s, and SWH up to 2 m. A geophysical parametric waveform model was used for\nretracking and estimation of the lapse between the direct and reflected signals\nwith a 1-second precision of 3 m. The lapse was used to estimate the SSH along\nthe track using a differential model. The RMS error of the 20 km averaged\nGNSS-R absolute altimetric solution with respect to Jason-1 SSH and a GPS buoy\nmeasurement was of 10 cm, with a 2 cm mean difference. Multipath and retracking\nparameter sensitivity due to the low altitude are suspected to have degraded\naccuracy. This result provides an important milestone on the road to a GNSS-R\nmesoscale altimetry space mission.",
"arxiv_id": "physics/0406025",
"authors": [
"G. Ruffini",
"F. Soulat",
"M. Caparrini",
"O. Germain",
"M. Martin-Neira"
],
"categories": [
"physics.ao-ph",
"physics.ins-det"
],
"doi": "10.1029/2004GL019994",
"title": "The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft",
"url": "https://arxiv.org/abs/physics/0406025"
},
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