Reflectometry with an open-source Software GNSS Receiver. Use Cases with Carrier Phase Altimetry.

[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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