| Currently,conventional indoor localization schemes mainly leverage WiFi-based or Bluetooth-based schemes to locate the users in the indoor environment.These schemes require to deployment the infrastructures such as the WiFi APs and Blue-tooth beacons in advance to assist indoor localization.This property hinders the indoor localization schemes in that they are not scalable to any other situations without these infrastructures.In this paper,we propose Footstep-Tracker,an anchor-free indoor localization scheme purely based on sensing the user's footsteps.By embedding the tiny SensorTag into the user's shoes,Footstep-Tracker is able to accurately perceive the user's mov-ing trace,including the moving direction and distance,by leveraging the accelerom-eters and gyroscopes.Furthermore,by detecting the user's activities such as ascend-ing/descending the stairs and taking an elevator,FootStep-Tracker can effectively cor-relate with the specified positions such as stairs and elevators,and further determine the exacted moving traces in the indoor map by leveraging the space constraints in the map.Realistic experiment results show that,FootStep-Tracker is able to achieve an average localization accuracy of 1m for indoor localization,without any infrastructures having been deployed in advance. |
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