Thales

Airbus Defence and Space Sas

Mathieu Raimondi

Hanaa Al Bitar

Benjamin Gadat

Charles Fernet

Jean-Frédéric Chouteau

Christophe Charbonnieras

Hugo Bourgoin

A coding method with differentiated protection to protect, with a different protection efficiency, a number of groups of data in a frame to be transmitted. The invention is based for that on the use of a correcting code of the LDPC type concatenated with an algebraic correcting code. The invention also proposes a decoding method compatible with the coding method with differentiated protection.

Coding and decoding methods with differentiated protection

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.

Method for correlating a received satellite radio-navigation signal and correlation device implementing the method

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Toulouse, France

Mathieu Raimondi