needs and service definition
to GALILEO Services
GALILEO Open Service provides positioning, velocity and timing information that
can be accessed free of direct charge. This service is suitable for mass-market
applications, such as in-car navigation and hybridisation with mobile
telephones. The timing service is synchronised with UTC when used with receivers
in fixed locations. This timing service can be used for applications such as
network synchronisation or scientific applications.
performance objectives in terms of position accuracy and availability will be
competitive with respect to existing GNSS and further planned evolutions. In
addition, the Open Service will also be interoperable with other GNSS, in order
to facilitate the provision of combined services.
Open Service signals are separated in frequency to permit the correction of
errors induced by ionospheric effects by differentiation of the ranging
measurements made at each frequency. Each navigation frequency will include two
ranging code signals (in-phase and quadrature). Data are added to one of the
ranging codes while the other "pilot" ranging code is data-less for
more precise and robust navigation measurements.