Cooperative calibration of platform shared voltage controlled oscillator
AssigneeCSR Technology Inc.
InventorDaniel Babitch
Life of this patent
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Abstract
A mobile communication device includes a global navigation satellite system (GNSS) receiver for receiving GNSS signals, a radio frequency (RF) receiver for receiving RF signals and a voltage controlled oscillator supplying an oscillator signal to the GNSS receiver and the RF receiver. The GNSS receiver and the RF receiver use the oscillator signal to receive the GNSS signals and the RF signals. The mobile communication device also includes a processor for initializing and/or adjusting a model of a frequency behavior of the voltage controlled oscillator, and uses the model to track the GNSS signals when computing a location of the mobile communication device.
Claims20
A mobile communication device including:
- a global navigation satellite system (GNSS) receiver for receiving GNSS signals;
- a radio frequency (RF) receiver for receiving RF signals;
- a voltage controlled oscillator supplying an oscillator signal to the GNSS receiver and the RF receiver, the GNSS receiver and the RF receiver using the oscillator signal to receive the GNSS signals and the RF signals;
- and
- a processor configured to:
- initialize a model of a frequency behavior of the voltage controlled oscillator by stepping a control voltage of the voltage controlled oscillator through a predetermined dynamic range and measuring an operating temperature and an oscillation frequency at each step, and
- use the initialized model and the oscillator signal to track the GNSS signals when computing a location of the mobile communication device.
A mobile communication device including:
- a global navigation satellite system (GNSS) receiver for receiving GNSS signals;
- a cellular receiver for receiving cellular signals;
- a voltage controlled oscillator supplying an oscillator signal to the GNSS receiver and the cellular receiver, the GNSS receiver and the cellular receiver using the oscillator signal to receive the GNSS signals and the cellular signals;
- and
- a processor configured to:
- determine when the cellular receiver is not receiving cellular signals,
- when the cellular receiver is not receiving cellular signals adjust a model of a frequency behavior of the voltage controlled oscillator by comparing a frequency of the oscillator signal to a reference frequency of a reference signal while varying a control voltage applied to the voltage controlled oscillator through a predetermined dynamic range at a measured temperature, and
- use the adjusted model to estimate the frequency of the oscillator signal to track the GNSS signals when computing a location of the mobile communication device.
A method for controlling a mobile communication device including a global navigation satellite system (GNSS) receiver for receiving GNSS signals, a radio frequency (RF) receiver for receiving RF signals, a voltage controlled oscillator supplying an oscillator signal to the GNSS receiver and the RF receiver, and a processor for controlling the mobile communication device, the method including the steps of:
- determining when the cellular receiver is not receiving cellular signals,
- when the cellular receiver is not receiving cellular signals adjusting, by the processor, a model of a frequency behavior of the voltage controlled oscillator by comparing a frequency of the oscillator signal to a reference frequency of a reference signal while varying a control voltage applied to the voltage controlled oscillator through a predetermined dynamic range at a measured temperature, and
- using, by the GNSS receiver, the oscillator signal and the model to track the GNSS signals when computing a location of the mobile communication device.
Dependencies are inferred from the claim text.