Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2004-12-17
2011-10-11
Issing, Gregory C (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357690
Reexamination Certificate
active
08035555
ABSTRACT:
One embodiment of the present invention provides a method of creating a set of spreading codes for use in a satellite navigation system comprising a constellation of satellites. Each satellite in the constellation is to be allocated a spreading code from the set of spreading codes. The method comprises generating an initial set of bit patterns (105), where each bit pattern represents a potential spreading code, and performing an optimization process on the initial set of bit patterns (110). The optimization process modifies at least some of the bit patterns in the initial set to create a final set of bit patterns for use as the set of spreading codes (115) for the satellite navigation system. Receivers that support the satellite navigation system incorporate the final set of bit patterns for use in signal acquisition and position determination.
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Pratt, Anthony “A New Class of Spreading COdes Exhibiting Low Cross-Correlation Properties”, ION GPS 2002, 9/2202, pp. 1554-1564.
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JP2003110462 A dated Apr. 11, 2003, Translation dated Oct. 26, 2010.
Issing Gregory C
Park Vaughan Fleming & Dowler LLP
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