TY - JOUR
T1 - Multi-Constellation System as Augmentation to GPS Performance in Difficult Environment or Critical Applications
JF - ATTI DELL'ISTITUTO ITALIANO DI NAVIGAZIONE
Y1 - 2009
A1 - ANGRISANO, A
A1 - GAGLIONE, S
A1 - PACIFICO, A
A1 - VULTAGGIO, M
AB -
The GPS Standard Positioning Service (SPS) does
not provide suitable performance in all environment
conditions or in every possible applications. In
severely signal degraded environments, e.g.
mountainous or urban areas, where a lot of GPS
signals are blocked by buildings or natural
obstacles, the positioning is inaccurate because of
bad satellite configuration or impossible owing to
lack of minimum number of visible satellites.
Otherwise GPS SPS is inadequate for critical safety
applications like aircraft take-off or landing, because
does not satisfy the Required Navigation Parameters
(RNP) relative to these flight phases.
To solve the GPS gap on regional scale, space-based
augmentations could be employed. In this study a
simulation is carried out, considering GLONASS
and EGNOS GEO constellations and a set of 3
geosynchronous satellites (similar to QZSS space
segment). A software for constellation analysis is
developed in MATLABĀ® environment to evaluate
the considered augmentations performances in
critical conditions (urban canyon or critical phase of
flight). The used indicators to evaluate coverage
performance are the VSN (Visible Satellites
Number), DOP (Dilution of Precision) and the
probability that integrity is available to be computed
in autonomous.
VL - 190
N1 - Paper Selected from the ENC - 2009 Conference held in Naples on 4 - 6 May 2009
ER -