Inertial Sensing

The use of accelerometers, gyroscopes, and magnetometers — often built into smartphones and wearable devices — to measure motion, orientation, and direction of movement. In accessibility applications, inertial sensing enables dead reckoning for indoor navigation where GPS is unavailable, step counting for distance estimation, and turn detection for route tracking. For blind and visually impaired users, smartphone-based inertial sensing is particularly promising because it requires no external infrastructure (unlike Bluetooth beacons or visual markers) and works with a device conveniently carried in a pocket. However, algorithms must account for the distinct gait patterns of blind walkers, including cane-induced arm movements and involuntary veering.