Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2011-06-07
2011-06-07
Issing, Gregory C (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357620
Reexamination Certificate
active
07956804
ABSTRACT:
A method and apparatus for estimating oscillator signal variation due to temperature and for providing an estimated frequency to a GPS receiver in order to assist the GPS receiver to acquire the signals quickly is disclosed. A temperature sensor is closely thermally coupled with the crystal oscillator in the GPS receiver and during GPS tracking mode, when the error in the oscillator signal is known with precision, outer bounds of TCXO frequency at given temperatures are maintained, which may correspond to rising and falling temperature conditions. During acquisition mode, an estimated frequency value is provided to the GPS receiver based on a determined average of these bounds. Optionally, an uncertainty factor associated with the frequency estimated may also be provided. The two bounds take into account the hysteresis effects of the oscillator signal drift due to temperature so that a more accurate initial frequency estimate can be provided to the GPS receiver, thus reducing its average time to first fix.
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Filler, Raymond L., Measurement and Analysis of Thermal Hysteresis in Resonators and TCXOs, 42ndAnnual Frequencey Control Symposium, 1988, 380-388, US Army Electronics Technology & Devices Laboratory (LABCOM), Fort Monmouth, NJ.
Filler, Raymond L., Measurement and Analysis of Thermal Hysteresis in Resonators and TXCO's, 42nd Annual Frequency Control Symposium, 1988, 380-388.
Grant Christopher James
Jin Xin
Rosselet Andrew Jonathan Gilbert
Issing Gregory c
Research In Motion Limited
Ridout & Maybee LLP
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