Study of Delay Drift in GNSS-R Altimetry

Differently to the case of a conventional spaceborne nadir-looking mono-static radar altimeter, where the fly-around time of the pulses remains basically constant (assuming an almost circular orbit around an almost spherical Earth), the bistatic geometry of GNSS-R with the transmitter and the receiv...

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Published inIEEE journal of selected topics in applied earth observations and remote sensing Vol. 7; no. 5; pp. 1473 - 1480
Main Authors Martin-Neira, Manuel, DaAddio, Salvatore, Vitulli, Raffaele
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2014
Subjects
Accuracy
Altimetry
Correlation
Delays
GNSS reflectometry
ocean altimetry
Oceans
PARIS concept
Receivers
Satellites
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Summary:Differently to the case of a conventional spaceborne nadir-looking mono-static radar altimeter, where the fly-around time of the pulses remains basically constant (assuming an almost circular orbit around an almost spherical Earth), the bistatic geometry of GNSS-R with the transmitter and the receiver embarked on different satellites imprints a significant temporal variation to the delays of the direct and reflected signals. Within a GNSS-R-based spaceborne ocean altimeter using the PARIS concept, such temporal variation in the delay has to be compensated for with the objective to finely adjust the delay of the direct signal to permanently match with that of the reflected signal according to some a priori model of the geometry. The impact of the residual delay drift on the accuracy and the precision of the range observations is assessed here.
ISSN:1939-1404
DOI:10.1109/JSTARS.2014.2307168