A mobile communications device using a common oscillator for communication and global positioning system (GPS) functions. In one embodiment, a communications unit receives a precision carrier frequency signal from a source and generates a reference signal that is used to calibrate a common oscillator.

 
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< GPS rover station for synthesizing synthetic reference phases for controlling accuracy of high integrity positions

< Systems and methods for navigating based on GPS and terrestrial location information

> Signal folding coherent acquisition for weak global positioning system (GPS) C/A coded signal

> Antenna array apparatus and beamforming method using GPS signal for base station in mobile telecommunication system
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