Title :
A numerical simulator to evaluate the electromagnetic bias in GNSS-R altimetry
Author :
Ghavidel, Ali ; Schiavulli, Domenico ; Camps, Adriano
Author_Institution :
IEEC, Univ. Politec. de Catalunya-Barcelona Tech, Barcelona, Spain
Abstract :
This paper presents the computed electromagnetic (EM) bias predicted for GNSS-R altimetry systems. First, a synthetic time-evolving sea surface is generated satisfying an ocean surface height spectrum. Then, a direct GNSS signal recorded by an up-looking antenna is used as the GNSS signal “illuminating” the synthetic sea surface, and the scattered waves are simulated using the Geometric Optics (GO) method. Finally, using the fundamental definition of the EM bias, it is estimated and compared to the limited existing analytical methods.
Keywords :
numerical analysis; ocean waves; oceanographic techniques; satellite navigation; GNSS signal illumination; GNSS-R altimetry system; GO method; analytical method; computed electromagnetic bias; direct GNSS signal; electromagnetic bias evaluation; fundamental EM bias definition; geometric optics method; numerical simulator; ocean surface height spectrum; scattered wave simulation; synthetic sea surface; synthetic time-evolving sea surface; up-looking antenna; Altimetry; Electromagnetics; Optical surface waves; Scattering; Sea surface; Surface waves; Wind speed; GNSS-R; altimetry; electromagnetic bias; scattering;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International
Conference_Location :
Quebec City, QC
DOI :
10.1109/IGARSS.2014.6947379
