First assessment of geophysical sensitivities from spaceborne Galileo and BeiDou GNSS-Reflectometry data collected by the UK TechDemoSat-1 Mission

Hammond, Matthew L. ORCID: https://orcid.org/0000-0002-8918-2351; Foti, Giuseppe ORCID: https://orcid.org/0000-0002-1507-2133; Rawlinson, Jonathan; Gommenginger, Christine ORCID: https://orcid.org/0000-0002-6941-1671; Srokosz, Meric ORCID: https://orcid.org/0000-0002-7347-7411; King, Lucinda; Unwin, Martin; Roselló, Josep. 2020 First assessment of geophysical sensitivities from spaceborne Galileo and BeiDou GNSS-Reflectometry data collected by the UK TechDemoSat-1 Mission. Remote Sensing, 12 (18), 2927. 9, pp. 10.3390/rs12182927

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Official URL: http://dx.doi.org/10.3390/rs12182927

Abstract/Summary

The UK’s TechDemoSat-1 (TDS-1), launched 2014, has demonstrated the use of global positioning system (GPS) signals for monitoring ocean winds and sea ice. Here it is shown, for the first time, that Galileo and BeiDou signals detected by TDS-1 show similar promise. TDS-1 made seven raw data collections, recovering returns from Galileo and BeiDou, between November 2015 and March 2019. The retrieved open ocean delay Doppler maps (DDMs) are similar to those from GPS. Over sea ice, the Galileo DDMs show a distinctive triple peak. Analysis, adapted from that for GPS DDMs, gives Galileo’s signal-to-noise ratio (SNR), which is found to be inversely sensitive to wind speed, as for GPS. A Galileo track transiting from open ocean to sea ice shows a strong instantaneous SNR response. These results demonstrate the potential of future spaceborne constellations of GNSS-R (global navigation satellite system–reflectometry) instruments for exploiting signals from multiple systems: GPS, Galileo, and BeiDou.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.3390/rs12182927
ISSN:	2072-4292
Date made live:	29 Sep 2020 15:39 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528567

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.3390/rs12182927

ISSN:

2072-4292

Date made live:

29 Sep 2020 15:39 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/528567