Indoor navigation system for a pedestrian using wearable sensors

摘要

This paper describes an indoor navigation system for a pedestrian wearing a sensing module to track the user's location in indoor environments. The proposed navigation system employs a hybrid position measurement method: dead-reckoning for relative measurements and a simple infrared based beacon method for absolute measurements. The prototype navigation system uses a set of inexpensive and wearable sensors- a bi-axial accelerometer, a digital compass, and an infra-red light detector. Using the measured acceleration data, the proposed method can detect forward steps and classify the steps as: "level ground," "up," and "down". The objective of the detection is to count steps for estimating the current position by dead-reckoning using heading measurements. The capability in detecting "up/down" steps can be used to correct estimated position errors.