Table 2.

Performance of the auto-correlation algorithm.

Position of Mobile Phone	Motion State of Pedestrian	Peak Detection Algorithm Steps	Auto-Correlation Algorithm Steps	True steps
In Hand	Changing frequency of walking	224	196	200
In Jacket pocket	Constant speed walking	233	202	200
In Hand	phone using when walking	204	198	200
In Hand	Constant speed walking	199	197	200
In Hand	Idle	0	0	0
Change positions	Idle	6	6	0