2026-04-05T10:52:46Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1028722026-01-18T04:32:55Zcom_2072_1033col_2072_452950

First results of a GNSS-R experiment from a stratospheric balloon over boreal forests Carreño Luengo, Hugo Camps Carmona, Adriano José Querol Borràs, Jorge Forte Veliz, Giuseppe Francesco Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció Remote sensing Taigas Boreal forests Global navigation satellite systems reflectometry (GNSS-R) Stratospheric balloon Ocean altimetry Scattering Reflectometry Signals Coherent Precision Surface System Bare Teledetecció Taigàs The empirical results of a global navigation satellite systems reflectometry (GNSS-R) experiment onboard the Balloon EXperiments for University Students (BEXUS) 17 stratospheric balloon performed north of Sweden over boreal forests show that the power of the reflected signals is nearly independent of the platform height for a high coherent integration time T-c = 20 ms. This experimental evidence shows a strong coherent component in the forward scattered signal, as compared with the incoherent component, that allows to be tracked. The bistatic coherent reflectivity is also evaluated as a function of the elevation angle, showing a decrease of similar to 6 dB when the elevation angle increases from 35. to 70 degrees. The received power presents a clearly multimodal behavior, which also suggests that the coherent scattering component may be taking place in different forest elements, i.e., soil, canopy, and through multiple reflections canopy-soil and soil-trunk. This experiment has provided the first GNSS-R data set over boreal forests. The evaluation of these results can be useful for the feasibility study of this technique to perform biomass monitoring that is a key factor to analyze the carbon cycle. Peer Reviewed Postprint (author's final draft) 2015-12-18 Article http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7360889 info:eu-repo/grantAgreement/MICINN//AYA2011-29183-C02-01/ES/APLICACIONES AVANZADAS EN RADIO OCULTACIONES Y DISPERSOMETRIA UTILIZANDO SEÑALES GNSS Y OTRAS SEÑALES DE OPORTUNIDAD/ info:eu-repo/grantAgreement/EC/FP7/607126/EU/European GNSS-R Environmental Monitoring/E-GEM Open Access Institute of Electrical and Electronics Engineers (IEEE)