Method and apparatus for satellite positioning system time resolution

An apparatus comprising:

• a satellite positioning system receiver configured to receive a first signal from a first satellite positioning system, the first signal having a first modulation sequence length, the satellite positioning system receiver also configured to receive a second signal from a second satellite positioning system, the second signal having a second modulation sequence length different from the first modulation sequence length;
• a controller coupled to the satellite positioning system receiver, the controller configured to control the operations of the apparatus;
• a time resolution module coupled to the controller, the time resolution module configured to determine a time offset between the first signal from the satellite of the first satellite positioning system and the second signal from the satellite of the second satellite positioning system based on an estimated propagation delay of the first signal and the second signal;
• and
• a satellite positioning system receiver position module coupled to the controller, the satellite positioning receiver position module configured to establish a position of the apparatus based on the time offset.

A method comprising:

• receiving a first signal from a first satellite of a first satellite positioning system;
• receiving a second signal from a second satellite of a second satellite positioning system;
• ascertaining a relative transmit time of the first signal relative to an estimated propagation time of the first signal from the first satellite;
• determining a time offset between the first signal and the second signal;
• deciding a search space for reduced time alignment possibilities for aligning a pseudorandom noise sequence based on the relative transmit time and the time offset;
• estimating a second satellite positioning system system time based on the search space;
• and
• establishing a position of a satellite positioning receiver based on the search space.