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Untangling the incoherent and coherent scattering components in GNSS-R and novel applications

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10.3390/rs12071208
 
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hdl:2117/327845

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Muñoz Martin, Joan FrancescMés informacióMés informació
Onrubia Ibáñez, RaúlMés informació
Pascual Biosca, DanielMés informacióMés informació
Hyuk, ParkMés informacióMés informacióMés informació
Camps Carmona, Adriano JoséMés informacióMés informacióMés informació
Rudiger, Christoph
Walker, Jeffrey
Monerris Belda, Alessandra
Document typeArticle
Defense date2020-04-09
PublisherMultidisciplinary Digital Publishing Institute (MDPI)
Rights accessOpen Access
Attribution 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution 3.0 Spain
ProjectSENSING WITH PIONEERING OPPORTUNISTIC TECHNIQUES (AEI-RTI2018-099008-B-C21)
Abstract
As opposed to monostatic radars where incoherent backscattering dominates, in bistatic radars, such as Global Navigation Satellite Systems Reflectometry (GNSS-R), the forward scattered signals exhibit both an incoherent and a coherent component. Current models assume that either one or the other are dominant, and the calibration and geophysical parameter retrieval (e.g., wind speed, soil moisture, etc.) are developed accordingly. Even the presence of the coherent component of a GNSS reflected signal itself has been a matter of discussion in the last years. In this work, a method developed to separate the leakage of the direct signal in the reflected one is applied to a data set of GNSS-R signals collected over the ocean by the Microwave Interferometer Reflectometer (MIR) instrument, an airborne dual-band (L1/E1 and L5/E5a), multi-constellation (GPS and Galileo) GNSS-R instrument with two 19-elements antenna arrays with 4 beam-steered each. The presented results demonstrate the feasibility of the proposed technique to untangle the coherent and incoherent components from the total power waveform in GNSS reflected signals. This technique allows the processing of these components separately, which increases the calibration accuracy (as today both are mixed and processed together), allowing higher resolution applications since the spatial resolution of the coherent component is determined by the size of the first Fresnel zone (300–500 meters from a LEO satellite), and not by the size of the glistening zone (25 km from a LEO satellite). The identification of the coherent component enhances also the location of the specular reflection point by determining the peak maximum from this coherent component rather than the point of maximum derivative of the incoherent one, which is normally noisy and it is blurred by all the glistening zone contributions
CitationMuñoz, J. [et al.]. Untangling the incoherent and coherent scattering components in GNSS-R and novel applications. "Remote sensing", 9 Abril 2020, 
URIhttp://hdl.handle.net/2117/327845
DOI10.3390/rs12071208
ISSN2072-4292
Publisher versionhttps://www.mdpi.com/2072-4292/12/7/1208
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  • Departament de Física - Articles de revista [1.714]
  • Departament de Teoria del Senyal i Comunicacions - Articles de revista [2.351]
  • Doctorat en Teoria del Senyal i Comunicacions - Articles de revista [145]
  • RSLAB - Remote Sensing Research Group - Articles de revista [614]
  • CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai - Articles de revista [72]
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