Method and apparatus for satellite positioning system (SPS) time measurement

A mobile satellite positioning system (SPS) receiver comprising:

• an antenna for receiving SPS signals;
• a demodulator coupled to said antenna, said demodulator removing a PN code from said SPS;
• a processor coupled to said demodulator, said processor determining a first record of at least a portion of a satellite data message received from said demodulator and determining a comparison range;
• a communication antenna;
• a communication receiver coupled to said communication antenna and to said processor, said communication receiver receiving a second record of said satellite data message, said processor comparing said first record and said second record at least in said comparison range determined from an estimated time when said first record was received at said mobile SPS receiver and determining a time indicating when said first record was received.

A machine readable medium which provides executable computer program instructions which when executed cause a processing system to perform a method, in a mobile satellite positioning system (SPS) receiver, for measuring time related to satellite data messages with use with an SPS, said method comprising:

• receiving at said mobile SPS receiver a first record of at least a portion of a satellite data message;
• receiving at said mobile SPS receiver a second record of said satellite data message;
• determining a comparison range;
• comparing said first record with said second record at least in said comparison range determined from an estimated time when said first record was received at said mobile SPS receiver;
• determining a time from said comparing, said time indicating when said first record was received at said mobile SPS receiver.