First dual-band multiconstellation GNSS-R scatterometry measurements over boreal forests from a stratospheric balloon
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This work presents the first ever dual-frequency multiconstellation Reflectometry using Global Navigation Satellite Systems signals (GNSS-R) observations over boreal forests and lakes using GPS, GLONASS, and Galileo signals. The instrument used is the PYCARO reflectometer, which flew on-board a stratospheric balloon during the SNSB and ESA sponsored BEXUS 19 experiment. The coherent-to-incoherent scattering ratio over boreal forests is found to be as large as ~1.5, while over lakes, it is as high as 16.5. The scatterers' height fluctuations measured using the phase of the peak of the reflected complex waveforms ranges from ±10 m, to the submetric level. Finally, reflectivity maps using the different GNSS codes are presented using the conventional GNSS-R for the open-access codes, and the reconstructed GNSS-R for the encrypted ones. The coherence of the reflected signal is found to be high enough to allow the PYCARO instrument to reconstruct the P(Y) code.
CitationCarreno-Luengo, H., Camps, A. First dual-band multiconstellation GNSS-R scatterometry measurements over boreal forests from a stratospheric balloon. "IEEE journal of selected topics in applied earth observations and remote sensing", 25 Novembre 2015, vol. 9, núm. 10, p. 4743-4751.