Patent ID: 7362263

Claim:
A hybrid navigation satellite receiver and mobile telephone combination ( 100 ), comprising: a master clock and reference oscillator ( 112 , 114 ) for both a GPS receiver ( 102 ) and mobile telephone ( 104 , and that consumes milliwatts of power, and that is shut off during a power down of a hybrid navigation satellite receiver and mobile telephone combination ( 100 ); a real time clock (RTC) and oscillator ( 126 , 128 ) that consumes only microwatts of power and operates continuously on battery power at about 32-KHz regardless of said power down; a GPS time regenerator ( 124 ) connected to the RTC ( 126 ) and providing for a regenerated GPS restart-time to a GPS-DSP ( 110 ) computed from an off-time and offset when said navigation satellite receiver ( 102 ) last was tracking GPS system time and frequency errors of the master clock were being corrected; a software controlled oscillator (SCXO) ( 118 ) for correcting the operating frequency of the master clock and reference oscillator ( 112 , 114 ) according to GPS time provided by said GPS-DSP ( 110 ), or provided by said regenerated GPS time from the GPS time regenerator ( 124 ) when GPS time is unavailable because tracking has not yet commenced; wherein, the master clock and reference oscillator ( 112 , 114 ) provides a corrected local oscillator reference frequency for both a GPS-RF stage ( 108 ) and a communications transceiver ( 132 ); and wherein, on any subsequent power restart, the navigation satellite receiver ( 102 ) can reduce frequency uncertainties and quicken its cold-start initialization.