u-blox GPS-Dead Reckoning Module

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The LEA-4R from u-blox is a small dead reckoning GPS module powered by the 16-channel ANTARIS 4 engine. Dead reckoning works by combining GPS satellite position data, gyroscope data (that measures angle turns) and odometer data (that measures distance covered) to calculate a position. The module incorporates the Epson XV-8000-CB gyroscope with a 40 Hz calculation rate and provides a one-second (1 Hz) position update rate. The combination of technologies supports continuous navigation in locations with poor or absent GPS such as tunnels, indoor parking facilities, and deep urban canyons. According to the company, the LEA-4R signal sensitivity is -140 dBm for acquisition and -150 dBm in tracking mode. u-blox AG, Thalwil, Switzerland.