GPS receiver having an initial adjustment for correcting for drift in reference frequency

A method in a global positioning system (GPS) receiver having a microprocessor coupled to a memory acquisition of a GPS signal after a time duration in a standby mode, including steps of:

• receiving said GPS signal with said GPS receiver;
• providing a timer signal having a reference time of arrival (TOA) based upon a reference frequency for use in acquiring said GPS signal;
• and
• calculating an initial TOA adjustment for correcting for a TOA drift in said reference TOA that has occurred during said time duration in said standby mode.

A global positioning system (GPS) receiver for receiving a GPS satellite signal, including:

• a memory including an executable program for calculating an initial frequency adjustment to correct for a frequency drift that has occurred in a reference frequency during a time duration in a standby mode;
• a microprocessor coupled to the memory for using the executable program for providing said initial frequency adjustment;
• and
• a correlator for receiving a GPS intermediate signal representative of said GPS satellite signal, receiving a reference signal including said reference frequency and coupled to the microprocessor for receiving said initial frequency adjustment, and providing a correlation signal representative of a correlation between said GPS intermediate signal and said reference signal as adjusted by said initial frequency adjustment when the GPS receiver enters an operational mode after said time duration in said standby mode.

A method in a global positioning system (GPS) receiver for improving the speed of acquisition of a GPS satellite signal after a time duration in a standby mode, including steps of:

• receiving said GPS satellite signal with said GPS receiver;
• converting said GPS satellite signal to a GPS intermediate signal;
• receiving a reference signal having a reference frequency;
• calculating an initial frequency adjustment for correcting for a drift in said reference frequency that has occurred during said time duration in said standby mode with a microprocessor coupled to a memory having an executable code;
• and
• correlating said GPS intermediate signal with said reference signal as adjusted by said initial frequency adjustment when said GPS receiver enters an operational mode after said time duration in said standby mode.