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Spaceborne GNSS-R minimum variance wind speed estimator

Spaceborne GNSS-R minimum variance wind speed estimator
Spaceborne GNSS-R minimum variance wind speed estimator
A Minimum Variance (MV) wind speed estimator for Global Navigation Satellite System-Reflectometry (GNSS-R) is presented. The MV estimator is a composite of wind estimates obtained from five different observables derived from GNSS-R Delay-Doppler Maps (DDMs). Regression-based wind retrievals are developed for each individual observable using empirical geophysical model functions that are derived from NDBC buoy wind matchups with collocated overpass measurements made by the GNSS-R sensor on the United Kingdom-Disaster Monitoring Constellation (UK-DMC) satellite. The MV estimator exploits the partial decorrelation that is present between residual errors in the five individual wind retrievals. In particular, the RMS error in the MV estimator, at 1.65 m/s, is lower than that of each of the individual retrievals. Although they are derived from the same DDM, the partial decorrelation between their retrieval errors demonstrates that there is some unique information contained in them. The MV estimator is applied here to UK-DMC data, but it can be easily adapted to retrieve wind speed for forthcoming GNSS-R missions, including the UK's TechDemoSat-1 (TDS-1) and NASA's Cyclone Global Navigation Satellite System (CYGNSS).
0196-2892
6829-6843
Clarizia, Maria Paola
c990fc40-109a-42cd-bc15-def020fd4dee
Ruf, Christopher S.
3927ac79-53d8-44ba-8c83-ba06fd851fc8
Jales, Philip
c41ba391-3d8e-439a-9342-8835ac0b9c33
Gommenginger, Christine
f0db32be-34bb-44da-944b-c6b206ca4143
Clarizia, Maria Paola
c990fc40-109a-42cd-bc15-def020fd4dee
Ruf, Christopher S.
3927ac79-53d8-44ba-8c83-ba06fd851fc8
Jales, Philip
c41ba391-3d8e-439a-9342-8835ac0b9c33
Gommenginger, Christine
f0db32be-34bb-44da-944b-c6b206ca4143

Clarizia, Maria Paola, Ruf, Christopher S., Jales, Philip and Gommenginger, Christine (2014) Spaceborne GNSS-R minimum variance wind speed estimator. IEEE Transactions on Geoscience and Remote Sensing, 52 (11), 6829-6843. (doi:10.1109/TGRS.2014.2303831).

Record type: Article

Abstract

A Minimum Variance (MV) wind speed estimator for Global Navigation Satellite System-Reflectometry (GNSS-R) is presented. The MV estimator is a composite of wind estimates obtained from five different observables derived from GNSS-R Delay-Doppler Maps (DDMs). Regression-based wind retrievals are developed for each individual observable using empirical geophysical model functions that are derived from NDBC buoy wind matchups with collocated overpass measurements made by the GNSS-R sensor on the United Kingdom-Disaster Monitoring Constellation (UK-DMC) satellite. The MV estimator exploits the partial decorrelation that is present between residual errors in the five individual wind retrievals. In particular, the RMS error in the MV estimator, at 1.65 m/s, is lower than that of each of the individual retrievals. Although they are derived from the same DDM, the partial decorrelation between their retrieval errors demonstrates that there is some unique information contained in them. The MV estimator is applied here to UK-DMC data, but it can be easily adapted to retrieve wind speed for forthcoming GNSS-R missions, including the UK's TechDemoSat-1 (TDS-1) and NASA's Cyclone Global Navigation Satellite System (CYGNSS).

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More information

Published date: November 2014
Organisations: Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 368506
URI: http://eprints.soton.ac.uk/id/eprint/368506
ISSN: 0196-2892
PURE UUID: 0d772b2e-b048-42de-afd1-a77a96edafd8

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Date deposited: 01 Sep 2014 15:55
Last modified: 14 Mar 2024 17:48

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Contributors

Author: Maria Paola Clarizia
Author: Christopher S. Ruf
Author: Philip Jales
Author: Christine Gommenginger

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