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GNSS-R altimeter based on Doppler multi-looking
dc.contributor.author | D'Addio, Salvatore |
dc.contributor.author | Martín Neira, Manuel |
dc.contributor.author | di Bisceglie, Maurizio |
dc.contributor.author | Galdi, Carmela |
dc.contributor.author | Martín Alemany, Francisco |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions |
dc.date.accessioned | 2014-09-02T09:15:23Z |
dc.date.created | 2014-05-01 |
dc.date.issued | 2014-05-01 |
dc.identifier.citation | d'Addio, S. [et al.]. GNSS-R altimeter based on Doppler multi-looking. "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing", 01 Maig 2014, vol. 7, núm. 5, p. 1452-1460. |
dc.identifier.issn | 1939-1404 |
dc.identifier.uri | http://hdl.handle.net/2117/23726 |
dc.description.abstract | Measuring ocean mesoscale variability is one of the main objectives of next generation satellite altimeters. Current radar altimeters make observations only at the nadir sub-satellite ground track, which is not sufficient to sample the ocean surface with the required spatial and temporal sampling. The GNSS-R concept has been proposed as an alternative observation system in order to overcome this limitation, since it allows performing altimetry along several points simultaneously over a very wide swath. Latest proposed GNSS-R altimeter configurations allow measuring sea height with an accuracy of few decimeters over spatial scales of 50-100 km, by means of a single-pass. This paper proposes an innovative processing and retracking concept for GNSS-R altimeters based on the acquisition of the full delay-Doppler map (DDM), which allows to acquire multiple waveforms at different Doppler frequencies, whose footprints are located outside the typical pulse-limited region. The proposed processing adapts the Synthetic Aperture Radar (SAR) delay-Doppler concept of spaceborne radar altimeters for use in a GNSS-R system. This processing yields additional multi-look with respect to conventional GNSS-R concepts and translates into an improvement of the altimetry performance estimated to be at least 25%-30%, and even higher, depending on the wanted along-track spatial resolution. The proposed processing can also provide measurements with high spatial resolution at best possible performance, and more generally, offers various possibilities for optimal trade-off between spatial-resolution and height estimation accuracy. |
dc.format.extent | 9 p. |
dc.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura |
dc.subject | Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica |
dc.subject.lcsh | Altitudes--Measurement |
dc.subject.lcsh | Global Positioning System |
dc.subject.other | Delay-Doppler altimetry |
dc.subject.other | GNSS reflectometry |
dc.subject.other | Ocean altimetry |
dc.subject.other | PARIS concept |
dc.subject.other | Radar altimeter |
dc.subject.other | Ocean altimetry |
dc.subject.other | GPS signals |
dc.subject.other | Surface |
dc.subject.other | System |
dc.title | GNSS-R altimeter based on Doppler multi-looking |
dc.type | Article |
dc.subject.lemac | Altituds -- Mesurament |
dc.subject.lemac | Sistema de posicionament global |
dc.subject.lemac | GNSS (Sistema de navegació) |
dc.identifier.doi | 10.1109/JSTARS.2014.2309352 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6777324 |
dc.rights.access | Restricted access - publisher's policy |
local.identifier.drac | 15015542 |
dc.description.version | Postprint (published version) |
dc.date.lift | 10000-01-01 |
local.citation.author | d'Addio, S.; Martín, M.; di Bisceglie, M.; Galdi, C.; Martin, F. |
local.citation.publicationName | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
local.citation.volume | 7 |
local.citation.number | 5 |
local.citation.startingPage | 1452 |
local.citation.endingPage | 1460 |
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