A RECEIVER FOR USE WITH A GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) THAT TRANSMITS ALTERNATE BINARY OFFSET (ALTBOC) SIGNALS AND A METHOD OF DETERMINING GLOBAL POSITION FROM SAID ALTBOC SIGNALS RECEIVED FROM THE GNSS

摘要

There is disclosed a receiver for use with a global navigation satellite system that transmits Alternate binary offset carrier, or AltBOC signals. The receiver includes a local composite code generator (24) for producing real and imaginary code components (Ipilot, Qpilot) of a local version of an AltBOC composite code obtained by combining locally produced codes (c3, c4) with real and imaginary components (cr, sr) of upper and lower subcarriers (er, er*) ; a correlation subsystem (22, 26) for producing correlation signals (Iprompt, Qprompt) resulting from 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 (Ibaseband, Qbaseband) of the received signal by the locally produced real and imaginary composite code components ; and a controller (40) for adjusting the local composite code generator to align the local composite code with the corresponding composite code in the received AltBOC signal based on the correlation signals, the controller comprising means for determining a global position based on timing differences between times the AltBOC composite codes are transmitted and the times the codes are received.