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Sensors (Basel). 2016 May 20;16(5). pii: E732. doi: 10.3390/s16050732.

GLORI: A GNSS-R Dual Polarization Airborne Instrument for Land Surface Monitoring.

Author information

1
CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, France18 Avenue Edouard Belin, Toulouse Cedex 9 31401, France. erwan.motte@cesbio.cnes.fr.
2
CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, France18 Avenue Edouard Belin, Toulouse Cedex 9 31401, France. mehrez.zribi@cesbio.cnes.fr.
3
CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, France18 Avenue Edouard Belin, Toulouse Cedex 9 31401, France. pascal.fanise@cesbio.cnes.fr.
4
Cooperative Institute for Climate and Satellites, University of Maryland (CICS-MD/UMD), Appointed at the Laboratory for Satellite Altimetry, National Oceanographic and Atmospheric Administration (NOAA), College Park, MD 20740, USA. alejandro.egido@noaa.gov.
5
GET, Université de Toulouse, CNRS, IRD, UPS, 14 Avenue Édouard Belin, Toulouse 31400, France. jose.darrozes@get.obs-mip.fr.
6
ISPA, INRA, Bordeaux Sciences Agro, Villenave d'Ornon 33140, France. amen.alyaari@bordeaux.inra.fr.
7
IRSTEA, UMR TETIS, 500 Rue François Breton, Montpellier cedex 5 34093, France. nicolas.baghdadi@teledetection.fr.
8
CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, France18 Avenue Edouard Belin, Toulouse Cedex 9 31401, France. frederic.baup@cesbio.cnes.fr.
9
ISPA, INRA, Bordeaux Sciences Agro, Villenave d'Ornon 33140, France. sylvia.dayau@bordeaux.inra.fr.
10
CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, France18 Avenue Edouard Belin, Toulouse Cedex 9 31401, France. fieuzalr@cesbio.cnes.fr.
11
Matis-IGN/UPEM, 5 Boulevard Descartes, Marne la Vallée Cedex 2 77454, France. pierre-louis.frison@u-pem.fr.
12
ISPA, INRA, Bordeaux Sciences Agro, Villenave d'Ornon 33140, France. guyon@bordeaux.inra.fr.
13
ISPA, INRA, Bordeaux Sciences Agro, Villenave d'Ornon 33140, France. wigneron@bordeaux.inra.fr.

Abstract

Global Navigation Satellite System-Reflectometry (GNSS-R) has emerged as a remote sensing tool, which is complementary to traditional monostatic radars, for the retrieval of geophysical parameters related to surface properties. In the present paper, we describe a new polarimetric GNSS-R system, referred to as the GLObal navigation satellite system Reflectometry Instrument (GLORI), dedicated to the study of land surfaces (soil moisture, vegetation water content, forest biomass) and inland water bodies. This system was installed as a permanent payload on a French ATR42 research aircraft, from which simultaneous measurements can be carried out using other instruments, when required. Following initial laboratory qualifications, two airborne campaigns involving nine flights were performed in 2014 and 2015 in the Southwest of France, over various types of land cover, including agricultural fields and forests. Some of these flights were made concurrently with in situ ground truth campaigns. Various preliminary applications for the characterisation of agricultural and forest areas are presented. Initial analysis of the data shows that the performance of the GLORI instrument is well within specifications, with a cross-polarization isolation better than -15 dB at all elevations above 45°, a relative polarimetric calibration accuracy better than 0.5 dB, and an apparent reflectivity sensitivity better than -30 dB, thus demonstrating its strong potential for the retrieval of land surface characteristics.

KEYWORDS:

GNSS-R; GPS; L-Band; airborne; biomass; microwave; multistatic radar; reflectometry; soil moisture; vegetation

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