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Patent

Spreading codes for a satellite navigation system (concerning secondary codes)

The present invention relates to a spreading code for a satellite navigation system, generation and use. An embodiment of the present invention to provide a method for creating a set of secondary spreading codes for use in satellite constellation...

Details

Identification
2967
Publication date
31 May 2016

Description

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.

 

THE MAIN APPLICATION AREAS

  • Global Navigation Satellite Systems (GNSS)
  • location-based services (lbs)
  • road
  • aviation
  • rail
  • maritime
  • agriculture
  • surveying
  • timing & synchronisation

 

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Spreading codes for a satellite navigation system (concerning secondary codes)
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