| Autor: |
Giuseppe Foti, Christine Gommenginger, Josep Rosello, Martin Unwin, Andy Shaw, Philip Jales, Colette Robertson |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Geophysical Research Letters. 42:5435-5441 |
| ISSN: |
0094-8276 |
| DOI: |
10.1002/2015gl064204 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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