Satellite-Free Navigation by STMicroelectronics

3 08 2011

This system, intended for phones and other mobile devices, can determine location in the absence of GPS or Wi-Fi signals. A dedicated processor combines input from three sources: a gyroscope, a sensor that measures Earth’s magnetic fields, and a silicon-based air pressure sensor that estimates altitude. This allows the processor to use dead reckoning to estimate the device’s position relative to its last good GPS or Wi-Fi fix

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