Spaceborne GNSS-Reflectometry for ocean winds: First results from the UK TechDemoSat-1 mission
Spaceborne GNSS-Reflectometry for ocean winds: First results from the UK TechDemoSat-1 mission
First results are presented for ocean surface wind speed retrieval from reflected GPS signals measured by the Low-Earth-Orbiting UK TechDemoSat-1 satellite (TDS-1). Launched in July 2014, TDS-1 provides the first new spaceborne Global Navigation Satellite System-Reflectometry (GNSS-R) data since the pioneering UK-Disaster Monitoring Mission experiment in 2003. Examples of onboard-processed delay Doppler Maps reveal excellent data quality for winds up to 27.9 m/s. Collocated ASCAT scatterometer winds are used to develop and evaluate a wind speed algorithm based on Signal-to-Noise ratio (SNR) and the Bistatic Radar Equation. For SNR greater than 3 dB, wind speed is retrieved without bias and a precision around 2.2 m/s between 3–18 m/s even withoutcalibration. Exploiting lower SNR signals however requires good knowledge of the antenna beam, platform attitude and instrument gain setting. This study demonstrates the capabilities of low-cost, low-mass, low-power GNSS-R receivers ahead of their launch on the NASA CYGNSS constellation in 2016.
GNSS-Reflectometry, Ocean wind speed, TechDemoSat-1
5435-5441
Foti, Giuseppe
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Gommenginger, Christine
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Jales, Philip
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Unwin, Martin
ff2a649c-769f-4dc0-8fc1-ea9f53efc351
Shaw, Andrew
ca9c2521-7de8-4faf-a1ac-14107eebc1cd
Robertson, Colette
5cf6b375-6fe1-4cea-be59-992ce5aba298
Rosello, Josep
1db07492-5873-4d31-9d24-0d9cc12c47f3
16 July 2015
Foti, Giuseppe
d77b7bb4-b489-4fce-b5d7-d2f983c8509f
Gommenginger, Christine
f0db32be-34bb-44da-944b-c6b206ca4143
Jales, Philip
c41ba391-3d8e-439a-9342-8835ac0b9c33
Unwin, Martin
ff2a649c-769f-4dc0-8fc1-ea9f53efc351
Shaw, Andrew
ca9c2521-7de8-4faf-a1ac-14107eebc1cd
Robertson, Colette
5cf6b375-6fe1-4cea-be59-992ce5aba298
Rosello, Josep
1db07492-5873-4d31-9d24-0d9cc12c47f3
Foti, Giuseppe, Gommenginger, Christine, Jales, Philip, Unwin, Martin, Shaw, Andrew, Robertson, Colette and Rosello, Josep
(2015)
Spaceborne GNSS-Reflectometry for ocean winds: First results from the UK TechDemoSat-1 mission.
Geophysical Research Letters, 42 (13), .
(doi:10.1002/2015GL064204).
Abstract
First results are presented for ocean surface wind speed retrieval from reflected GPS signals measured by the Low-Earth-Orbiting UK TechDemoSat-1 satellite (TDS-1). Launched in July 2014, TDS-1 provides the first new spaceborne Global Navigation Satellite System-Reflectometry (GNSS-R) data since the pioneering UK-Disaster Monitoring Mission experiment in 2003. Examples of onboard-processed delay Doppler Maps reveal excellent data quality for winds up to 27.9 m/s. Collocated ASCAT scatterometer winds are used to develop and evaluate a wind speed algorithm based on Signal-to-Noise ratio (SNR) and the Bistatic Radar Equation. For SNR greater than 3 dB, wind speed is retrieved without bias and a precision around 2.2 m/s between 3–18 m/s even withoutcalibration. Exploiting lower SNR signals however requires good knowledge of the antenna beam, platform attitude and instrument gain setting. This study demonstrates the capabilities of low-cost, low-mass, low-power GNSS-R receivers ahead of their launch on the NASA CYGNSS constellation in 2016.
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Accepted/In Press date: 7 July 2015
Published date: 16 July 2015
Keywords:
GNSS-Reflectometry, Ocean wind speed, TechDemoSat-1
Organisations:
Marine Physics and Ocean Climate
Identifiers
Local EPrints ID: 377882
URI: http://eprints.soton.ac.uk/id/eprint/377882
ISSN: 0094-8276
PURE UUID: 4adfe36b-4dfe-4cbe-88f0-24a5676de49c
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Date deposited: 09 Jun 2015 16:24
Last modified: 14 Mar 2024 20:11
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Contributors
Author:
Giuseppe Foti
Author:
Christine Gommenginger
Author:
Philip Jales
Author:
Martin Unwin
Author:
Andrew Shaw
Author:
Colette Robertson
Author:
Josep Rosello
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