Method and apparatus for calibrating a global positioning system oscillator
AssigneeMotorola, Inc.
InventorsMohammad Bani Hani, Bruce Bernhardt
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Abstract
A method (200) and apparatus (100) for calibrating a global positioning system oscillator is disclosed. The apparatus may include a global positioning system receiver (120), a temperature compensated oscillator (130) coupled to the global positioning system receiver, a controller (140) coupled to the global positioning system receiver, and an offset module (150) coupled to the controller. The controller can control the operations of the apparatus. The offset module can send a calibration signal to the global positioning system receiver using values corresponding to an oscillator frequency rate of change vs. time.
Claims20
An apparatus comprising:
- a global positioning system receiver;
- a temperature compensated oscillator coupled to the global positioning system receiver;
- a controller coupled to the global positioning system receiver, the controller configured to control the operations of the apparatus;
- and
- an offset module coupled to the controller, the offset module configured to send a calibration signal to the global positioning system receiver using values corresponding to an oscillator frequency rate of change vs. time.
A method comprising:
- initiating, in a global positioning system receiver, signal acquisition from a global positioning system satellite;
- adjusting a signal from a temperature compensated oscillator based on temporally changing compensation values for the temperature compensated oscillator;
- and
- acquiring a signal from the global positioning system satellite based on the adjusted signals of the temperature compensated oscillator.
An apparatus comprising:
- a global positioning system receiver;
- a temperature compensated oscillator coupled to the global positioning system receiver;
- a controller coupled to the global positioning system receiver, the controller configured to control the operations of the apparatus;
- a memory coupled to the controller, the memory including information corresponding to frequency drift characteristics of the temperature compensated oscillator as a function of frequency and time;
- an offset module coupled to the controller, the offset module configured to send a calibration signal to the global positioning system receiver using values based on the information corresponding to frequency drift characteristics, where the offset module provides the global positioning system receiver with the calibration signal prior to satellite signal acquisition;
- and
- an interface coupled to the controller, where the interface is configured to output signals corresponding to a position determined by the global positioning system receiver.
Dependencies are inferred from the claim text.