Spreading codes for a satellite navigation system

G - Physics – 01 – S

Patent

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G01S 1/00 (2006.01) H04J 13/04 (2006.01)

Patent

CA 2613583

One embodiment of the invention provides a method of creating a set of secondary spreading codes for use in a satellite navigation system comprising a constellation of satellites. Each satellite in the constellation employs a tiered spreading code comprising at least a primary . code and a secondary code. Each satellite in the constellation is allocated a different secondary spreading code from the set of secondary spreading codes. The method involves generating an initial set of bit patterns, where each bit pattern represents a potential secondary spreading code. The method further involves performing an optimisation process on bit patterns within the initial set of bit patterns. As a result of the optimisation, at least some of the bit patterns in the initial set are modified or replaced, to create a final set of bit patterns for use as the set of secondary spreading codes.

Un mode de réalisation de l'invention concerne un procédé de création d'un ensemble de codes de synchronisation secondaires destinés à être utilisé dans un système de navigation par satellite comprenant une constellation de satellites. Chaque satellite de cette constellation utilise un code de synchronisation à plusieurs niveaux comprenant au moins un code primaire et un code secondaire. Chaque satellite de la constellation reçoit un code de synchronisation secondaire différent issu de l'ensemble de codes de synchronisation secondaires. Le procédé de l'invention consiste à produire un ensemble de configurations binaires de départ, chaque configuration binaire représentant un code de synchronisation secondaire potentiel. Le procédé consiste ensuite à soumettre les configurations binaires à une optimisation à l'intérieur de l'ensemble de configurations binaires de départ. Suite à cette optimisation, au moins certaines des configurations binaires de l'ensemble de départ sont modifiées ou replacées, pour créer un ensemble de configurations binaires finales destinées à être utilisées comme codes de synchronisation secondaires

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