Patent ID: 6922167

Claim:
A receiver for use with a global navigation satellite system that transmits Alternate binary offset carrier, or AltBOC signals, the receiver including: A. a local composite code generator that produces a local version of an AltBOC composite code as combinations of locally produced real and imaginary code components; B. a correlation subsystem that produces correlation signals, the correlation subsystem correlating the locally produced composite code with the composite code in a received AltBOC signal by combining products produced by multiplying baseband inphase and quadrature components of the received signal by the locally produced real and imaginary composite code components; C. a controller that receives correlation signals from the correlation subsystem and adjusts the local composite code generator to align the local composite code with the corresponding composite code in the received AltBOC signal, the controller determining associated pseudoranges based on timing differences between the time the AltBOC composite code is transmitted and the time the code is received.