OPPORTUNISTIC CALIBRATION OF A SMARTPHONE ORIENTATION IN A VEHICLE

摘要

An opportunistic calibration method continuously monitors a smartphone orientation and compensates for its variation, as necessary. The method relies on the probabilistic fusion of built-in sensors; in particular, the GPS, accelerometer, gyroscope, and magnetometer. The calibration method may utilize a state-machine approach along with an orientation stability detection algorithm to keep track of the smartphone orientation over time and to coordinate the calibration process in an opportunistic manner. An orientation calibration method may rely mainly on the probabilistic fusion of GPS and magnetometer sensory data.

主权项

1. A method for calibrating a relative orientation of a smartphone in a vehicle including the steps of:
a) determining a stability of the orientation of the smartphone based upon first sensory data; b) collecting second sensory data; c) estimating the relative orientation of the smartphone based upon the second sensory data collected in said step b) while the orientation of the smartphone was determined to be stable in said step a).