A total of 25 frames are needed to complete the almanac. It allows to quickly identify the satellite from which the signal comes.
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It includes the Ephemeris parameters, needed to compute the satellite coordinates with enough accuracy, the Time parameters and Clock Corrections, to compute satellite clock offsets and time conversions, the Service Parameters with satellite health information (used to identify the navigation data set), Ionospheric parameters model needed for single frequency receivers, and the Almanacs, allowing the computation of the position of ”all satellites in the constellation”, with a reduced accuracy (1 - 2 km of 1-sigma error), which is needed for the acquisition of the signal by the receiver. The Navigation Message provides all the necessary information to allow the user to perform the positioning service. Hernandez-Pajares, University of Catalunia, Spain.Įvery satellite receives from the ground antennas the navigation data which is sent back to the users through the navigation message.