Modeling and Simulation of GNSS with NS2

Deployment of GNSS systems has paved the way to
the provision of location-based and navigation services with
growing accuracy and reliability. The introduction of the Galileo
system besides the GPS and GLONASS will constitute a major
technological advance of strategical importance for Europe in
particular. In such context instruments for investigation in the
field of GNSS are perceived as particular important for the
research community. In this work we present simulations of
GNSS system based on NS2, a well known simulator in the field
of telecommunication and network technology. Namely, we have
implemented a model for calculation of positioning exploiting the
existing NS2 satellite network models. We added the delay model
of the ionosphere and the troposphere, the ionosphere and
troposphere delay correction model and navigation algorithm.
Performance of those models have been compared with those of a
well-know reference simulator, i.e. STK. This comparison shows
that NS2 models allows to better model location errors due to
diurnal TEC variations.