@article {59,
title = {Copertura della Costellazione QZSS (Quasi-Zenith Satellite System)},
journal = {ATTI DELL{\textquoteright}ISTITUTO ITALIANO DI NAVIGAZIONE},
volume = {187},
year = {2008},
chapter = {91},
abstract = {
The objective of this work is the study of the QZSS constellation coverage; QZSS is a satellite\
system planned by Japan space agency as a GPS augmentation, to improve performances above all\
in zones with high urbanization, characterized by the so-called {\textquotedblleft}urban canyon{\textquotedblright}. In these zones a lot\
of GPS signals are blocked by buildings and they can{\textquoteright}t be used by GPS receivers, so there are often\
bad satellite observation geometries with no precise or even impossible positioning. QZSS\
satellites, because their orbital parameters, stay for a lot of hours in a day above the served areas\
with great elevation angles and so they give a good solution to the blocking problem in the towns.\
In this analysis to verify the improving of GPS coverage on Japan territory with QZSS satellites, it{\textquoteright}s
been made a computer simulation, which confirm the QZSS usefulness.\
Such coverage improvement could be obtained in every place of earth, because of quasi-symmetry\
of GPS constellation, changing the reference meridian of QZSS ground tracks; so it{\textquoteright}s been made the\
same simulation for Italy too, with more details obtained using a 3D model of an area of the centre\
of Naples.\
},
issn = {1120-6977},
author = {ANGRISANO, A and PACIFICO, A and VULTAGGIO, M}
}