Research in Motion Corporation

Blackberry Corporation

Mamdouh Kamal Yanni

Vahid Moosavi

Systems (), methods (), devices (), and computer programming products for improved navigation inside buildings and in other locations, using both passive and active NFC-capable devices, in conjunction with inertial and/or magnetic devices ().

Systems and methods for indoor navigation

An accelerometer with improved calibration features, an electronic device having an accelerometer with improved calibration features, and a method of calibrating an accelerometer of an electronic device are provided. In accordance with one embodiment, there is method of calibrating an accelerometer of an electronic device, the accelerometer having at least a primary sensing axis and a secondary sensing axis, the second sensing axis being oriented parallel to the primary sensing axis and in the opposite direction of the primary sensing axis, the method comprising: measuring acceleration calibration data using the primary sensing axis and the secondary sensing axis of the accelerometer; determining calibration parameters in accordance with measured calibration data from the accelerometer; and storing the calibration parameters in a memory of the electronic device.

Method for calibrating an accelerometer of an electronic device, an accelerometer, and an electronic device having an accelerometer with improved calibration features

A system and method of providing a clock signal to a navigation satellite receiver in a device is disclosed. A clock signal generated by a voltage controlled temperature compensated crystal oscillator (VCTCXO) in a cellular engine of the same device is appropriated to clock a numerically controlled oscillator (NCO) programmed to generate an adjusted clock signal suitable for use in receiving signals from navigation satellites and to heterodyne them down to baseband or an intermediate frequency for processing. Preferably, if the cellular engine has an automatic frequency control (AFC) module for adjusting the voltage control input to the VCTCXO to compensate for a change in the operating environment of the cellular engine, the AFC module modifies the control word in the NCO to counteract such adjustment so that the adjusted clock signal provided to the navigation satellite receiver is not unduly impacted. The use of the NCO ensures that the adjusted clock signal remains phase continuous throughout any such adjustments, so that positional lock of the navigation satellite receiver should not be lost. The sharing of the VCTCXO by the cellular engine and the navigation satellite receiver results in component cost and board space savings, economy in power consumption and reduced engineering effort in routing clock signals throughout the circuit board.

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Kitchener, Canada

Mamdouh Kamal Yanni