SNR-based GNSS reflectometry for coastal sea-level altimetry: results from the first IAG inter-comparison campaign

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SNR-based GNSS reflectometry for coastal sea-level altimetry: results from the first IAG inter-comparison campaign

Geremia-Nievinski, F. (författare): Universidade Federal do Rio Grande do Sul (UFRGS)

Hobiger, Thomas, 1978 (författare): Universität Stuttgart,University of Stuttgart

Haas, Rüdiger, 1966 (författare): Chalmers tekniska högskola,Chalmers University of Technology

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Liu, W. (författare): Shanghai Maritime University

Strandberg, Joakim, 1991 (författare): Chalmers tekniska högskola,Chalmers University of Technology

Tabibi, S. (författare): Université du Luxembourg,University of Luxembourg

Vey, S. (författare): Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)

Wickert, J (författare): Technische Universität Berlin,Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)

Williams, Simon D. P. (författare): National Oceanography Centre Southampton

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2020-07-23
2020
Engelska.
Ingår i: Journal of Geodesy. - : Springer Science and Business Media LLC. - 0949-7714 .- 1432-1394. ; 94:8

Relaterad länk:: https://research.cha...; visa fler...; https://doi.org/10.1...; visa färre...

Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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Ground-based Global Navigation Satellite System Reflectometry (GNSS-R) is quickly maturing toward the objective of becoming a viable alternative for operational coastal sea-level (SL) altimetry in a geocentric reference frame. SL has immense societal implications related to climate change. Of particular interest is the exploitation of existing coastal GNSS sites for reflectometry by means of signal-to-noise ratio (SNR) observables. We report results from the first inter-comparison campaign on SNR-based GNSS-R. The goal was to cross-validate retrieval solutions from independent research groups under comparable conditions. This action was an initiative of the International Association of Geodesy working group 4.3.9 (2015–2019 term). Data collected at the Onsala Space Observatory for a 1-year period (2015–2016) were compared to a co-located tide gauge (TG). SNR data for the GPS L1-C/A signal were processed by four groups, in Sweden, Luxembourg/Brazil, Germany, and the UK. Semidiurnal tidal constituents showed good agreement between TG and all GNSS-R groups. SL variations at diurnal and longer periods were also well captured by all series. Most GNSS-R solutions exhibited spurious tones at integer fractions of one sidereal day, the satellite revisit time of the particular GNSS constellation employed (GPS). Band-pass filtering between 3 h and 30 h confirmed that the dominant tidal components were well captured by most GNSS-R solutions. Higher-frequency SL variations (periods < 3 h) are poorly represented by GNSS-R as a consequence of its low temporal resolution. The solution with the worst agreement neglects a correction associated with the rate of change in sea level and uses narrower satellite elevation ranges per retrieval. Overall, there was excellent agreement, with correlation coefficients exceeding 0.9 and RMSE smaller than 5 cm.

Ämnesord

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

GPS
Altimetry
SNR
GNSS-R
Reflectometry
Sea level
GNSS

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Av författaren/redakt...: Geremia-Nievinsk ...; Hobiger, Thomas, ...; Haas, Rüdiger, 1 ...; Liu, W.; Strandberg, Joak ...; Tabibi, S.; visa fler...; Vey, S.; Wickert, J; Williams, Simon ...; visa färre...

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NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Naturgeografi

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Klimatforskning

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Signalbehandling

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Av lärosätet: Chalmers tekniska högskola

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