Advantech TREK-303, User Manual

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TREK-550/303 User Manual 38
6.6 Dead Reckoning
Dead reckoning (DR) supplements GPS satellite position information with heading
and distance data provided by additional sensors. When GPS satellites are out of
sight, location is extrapolated using distance and angle information from the sensors.
DR enables accurate navigation even in locations with poor or absent GPS signals
such as tunnels, indoor parking facilities and deep urban canyons. In addition, DR
effectively eliminates the impact of multi-path effects in urban canyon environments.
6.7 G-sensor (3-axis Accelerometer)
A 3-axis accelerometer is integrated in TREK-550. This could be used to characterize
driver behavior such as hard accelerations, braking, and cornering.This also can tell
users other significant information that can be used in accident reconstruction etc. A
code example is provided for customer reference regarding how to access and con-
figure G-sensor. G-sensor is located on the motherboard inside the TREK-550.
Please refer the link (http://www.analog.com/static/imported-files/data_sheets/
ADXL345.pdf) for the G-sensor datasheet.