Article (Scientific journals)
Reflectometry with an open-source Software GNSS Receiver. Use Cases with Carrier Phase Altimetry.
Lestarquit, Laurent; Peyrezabes, Mathieu; Darrozes, José et al.
2016In IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
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Keywords :
GNSS; Reflectometry; altimetry
Abstract :
[en] An open-source GNSS software receiver allows to have full access to the signal processing and to make add-ons to the source code in order to obtain the desired GNSS reflectometry processing. The direct signal is processed in the standard way, its tracking loops replica are tapped to have a robust processing of the reflected signal in a master-slave configuration, with the very same carrier replica used to correlate the reflected signal. Additionally, the data bit sign is wiped off, which allows to extend the coherent integration time (CIT) well beyond the usual 20 milliseconds limit on the reflected way. This allows having a straightforward and accurate measurement of the Amplitude Ratio and Differential Carrier Phase between the direct and reflected signal. The possible applications are precise carrier phase altimetry and any application requiring signal amplitude ratio, or reflected signal Delay Map, with single or dual polarization, this includes code altimetry, humidity, biomass, soil roughness, ocean surface wind and wave height, snow and ice characteristics retrieval. This software is intended to be used as a research tool. It has been tested for carrier phase altimetry on real data sets collected in rather calm water conditions: at the 60 meter Cordouan Lighthouse, and during a 600 meter high ATR42 flight over a lake. In both case, continuous carrier phase measurement with a centimeter level precision were obtained when extending the CIT up to 500 ms. Increasing the CIT beyond 20 ms is the key to improve carrier phase altimetry robustness.
Disciplines :
Electrical & electronics engineering
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Earth sciences & physical geography
Author, co-author :
Lestarquit, Laurent;  Centre National d'Etudes Spatiales
Peyrezabes, Mathieu;  M3Systems France
Darrozes, José;  Université Paul Sabatier - Toulouse 3 - UPS
Motte, Erwan;  Centre National d'Etudes Spatiales
Roussel, Nicolas;  Université Paul Sabatier - Toulouse 3 - UPS
Wautelet, Gilles  ;  Centre National d'Etudes Spatiales
Frappart, Frédéric;  Observatoire Midi-Pyrénées
Ramillien, Guillaume;  Centre National de la Recherche Scientifique - CNRS
Biancale, Richard;  Centre National d'Etudes Spatiales
Zribi, Mehrez;  Centre National de la Recherche Scientifique - CNRS
Language :
English
Title :
Reflectometry with an open-source Software GNSS Receiver. Use Cases with Carrier Phase Altimetry.
Publication date :
2016
Journal title :
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
ISSN :
1939-1404
eISSN :
2151-1535
Publisher :
Institute of Electrical and Electronics Engineers, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 July 2016

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