The page is the basic structure for building the navigation message. They can be found the following fields within a page:
Sync: The synchronization pattern (101101110000), which is not encoded, allows the receiver to achieve synchronisation to the page boundary Read more…
F/NAV messages are used within the Open Service (OS) and they are transmitted in E5a frequency band (1176.45 Mhz). The complete navigation message data are transmitted as a sequence of frames. A frame is composed of several sub-frames, and a sub-frame is composed of several pages. The page is the basic structure for building the navigation message.F/NAV navigation message is transmitted on channel E5a at a rate of 25 bps. Read more…
The Galileo satellites transmit different message types: F/NAV type correspond to the Open Service (OS), I/NAV message correspond to the Safety of Life (SoL) and C/NAV to Comercial Service (CS).
The navigation message data are transmitted on each data component as a sequence of frames. A frame is composed of several sub-frames, and a sub-frame in turn is composed of several pages. Being this last one the basic structure for building the navigation message. Read more…
Polarization is a property of electromagnetic waves that can oscillate with more than one orientation. By convention, the orientation of the wave’s electric field at a point in space over one period of the oscillation specifies its orientation.
The magnitude and direction of an electric field is defined by what is called an electric field vector. The Galileo transmitted signals are Right-Hand Circularly Polarized (RHCP), which means that the electric field vectors have a constant magnitude but the direction changes in a rotary manner. If the wave is frozen in time, the electric field vector of the wave describes a helix along the direction of propagation. Read more…
The Galileo Navigation Signals are transmitted in four frequency bands (E5a, E5b, E6 and E1) providing a wide bandwith for the transmission of the Galileo signals.
The Galileo frequency bands have been selected in the allocated spectrum for Radio Navigation Satellite Services (RNSS) and in addition to that, E5a, E5b and E1 bands are included in the allocated spectrum for Aeronautical Radio Navigation Services (ARNS), employed by Civil-Aviation users, and allowing dedicated safety-critical applications. Read more…
The Galileo Open Service Signal In Space Interface Control Document (OS SIS-ICD) was posted on May 2006 and reviewed in Septembre 2010. It specifies the interface between the Galileo Space Segment and the Galileo User Segment Read more…