Method for creating a set of spreading codes for use in a secondary satellite navigation system receiver, memory device removu00ecvel for use in a receiver, apparatus, satellite signal, and methods of operation of a receiver and a server that communicates With receptors for use in combination with a satellite navigation system

摘要

Method for creating a set of spreading codes for use in a secondary satellite navigation system receiver, memory device removu00ecvel for use in a receiver, apparatus, satellite signal, and methods of operation of a receiver and a server that comumca C Om receptors for use in conjunction with a satellite navigation system.A method of the invention provides a method of creating a set of spreading codes for use in a secondary satellite navigation system comprising a constellation of satellites. Each satellite in the constellation employs a code spread layer comprising at least a primary and a secondary code code.Each satellite in the constellation is allocated a code spreading secondary set of codes, spreading secondary. The method involves generating an initial set of pattern of bits, where each bit pattern represents a code of secondary scattering potential.The method further involves performing an optimization process in the patterns of bits within the initial set of patterns of bits. As a result of the optimization, at least some of bit patterns in the original set are modified or replaced to create a final set of patterns of bits for use as the set of codes, spreading secondary.