Abstract: A method is provided for correlating a received satellite radio-navigation signal made up of a first pilot signal modulated with a first spreading code and a second data signal modulated with a second primary spreading code of a length equal to that of the first spreading code, the second data signal being further modulated with a secondary sequence comprising a plurality of chips, the duration of a chip being equal to a multiple of the length of the second primary spreading code, the first pilot signal and the second data signal being synchronous. The correlation method comprises the following steps: first correlations, over a plurality N of periods of the first spreading code, of the radio-navigation signal with the first spreading code; the selection, out of the N first correlations, of a subset containing a number M of correlations; and the coherent integration of the M correlations of the subset.

Abstract: A method is provided for correlating a received satellite radio-navigation signal made up of a first pilot signal modulated with a first spreading code and a second data signal modulated with a second primary spreading code of a length equal to that of the first spreading code, the second data signal being further modulated with a secondary sequence comprising a plurality of chips, the duration of a chip being equal to a multiple of the length of the second primary spreading code, the first pilot signal and the second data signal being synchronous. The correlation method comprises the following steps: first correlations, over a plurality N of periods of the first spreading code, of the radio-navigation signal with the first spreading code; the selection, out of the N first correlations, of a subset containing a number M of correlations; and the coherent integration of the M correlations of the subset.

Abstract: A system for amplifying signals generated by a unit for generating signals of a satellite, the system including: a first pathway including a first bandpass digital filter with finite impulse response and a first digital/analog converter; frequency transposition means; an amplifying device; a second pathway including a second bandpass digital filter with finite impulse response; gain means disposed at the output of said second digital filter, a phase-slaved numerically-controlled oscillator, and a second digital/analog converter; and a recombiner device for summing the signals of said first and second pathways.

Abstract: A system for amplifying signals generated by a unit for generating signals of a satellite, the system including: a first pathway including a first bandpass digital filter with finite impulse response and a first digital/analog converter; frequency transposition means; an amplifying device; a second pathway including a second bandpass digital filter with finite impulse response; gain means disposed at the output of said second digital filter, a phase-slaved numerically-controlled oscillator, and a second digital/analog converter; and a recombiner device for summing the signals of said first and second pathways.

Abstract: A device is dedicated to generating messages relating to at least one satellite navigation system and to be sent to navigation receivers. This device comprises processor means responsible for generating “description” messages to be broadcast to the navigation receivers from a chosen date and comprising a description of a format of future messages to be broadcast to the navigation receivers from a date after the chosen date.

Abstract: A device is dedicated to generating messages relating to at least one satellite navigation system and to be sent to navigation receivers. This device comprises processor means responsible for generating “description” messages to be broadcast to the navigation receivers from a chosen date and comprising a description of a format of future messages to be broadcast to the navigation receivers from a date after the chosen date.