The navigation data contain all the parameters that enable the user to position. They are stored on board each satellite with a validity duration and broadcast worldwide by all the satellites of the Galileo constellation. These are the 4 types of data needed to perform positioning: Read more…

There exist two types of I/NAV pages: Nominal and Alert pages.

Nominal pages have a duration of 2 seconds and they are transmitted sequentially in time in two parts of duration 1 second each in both E5b and E1frequency bands. The first part of a page is denoted “even” and the second one is denoted “odd”. Read more…

The I/NAV messages are used in Safety of Life (SoL). The I/NAV message structures are tarnsmitted in E5b (1207.14 MHz) and E1 (1575.42 MHz) frequency bands. In both frequencies the same page layout is used since the service provided on these frequencies is a dual frequency service, using frequency diversity. Read more…

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…