Directly acquiring precision code GPS signals

A method comprising:

• receiving acquisition assistance data from an assist server, wherein the acquisition assistance data identifies a set of satellites and includes time-of-week data indicating an initial time offset into a P-code pseudorandom code sequence for each of the satellites;
• receiving signals from the satellites;
• digitizing the signals to produce a stream of digital data;
• buffering an amount of the digital data;
• locally generating reference P-code pseudorandom code sequences for the satellites based on the respective initial time offsets for the satellites;
• correlating the digital data with the reference code sequences to identify correlation peaks having respective time offsets;
• and
• determining a position for a mobile unit based on the time offsets.

An apparatus comprising:

• an antenna to receive a signal from a satellite;
• a wireless modem to receive acquisition assistance data from an assist server;
• a reference generator to generate a reference pseudorandom code sequence based on the acquisition assistance data;
• and
• a processor to determine a time offset for a P-code pseudorandom code sequence associated with the signal based on the acquisition assistance data.

A method comprising:

• receiving acquisition assistance data from an assist server;
• directly acquiring a P-code signal from a satellite based on the acquisition assistance data without first acquiring a C-code signal from the satellite;
• and
• determining a time offset for a P-code pseudorandom code sequence associated with said P-code signal.