Using LS-SVM based motion recognition for smartphone indoor wireless positioning.
The paper presents an indoor navigation solution by combining physical motion recognition with wireless positioning. Twenty-seven simple features are extracted from the built-in accelerometers and magnetometers in a smartphone. Eight common motion states used during indoor navigation are detected by a Least Square-Support Vector Machines (LS-SVM) classification algorithm, e.g., static, standing with hand swinging, normal walking while holding the phone in hand, normal walking with hand swinging, fast walking, U-turning, going up stairs, and going down stairs. The results indicate that the motion states are recognized with an accuracy of up to 95.53% for the test cases employed in this study. A motion recognition assisted wireless positioning approach is applied to determine the position of a mobile user. Field tests show a 1.22 m mean error in "Static Tests" and a 3.53 m in "Stop-Go Tests".
Department of Navigation and Positioning, Finnish Geodetic Institute, FIN-02431 Masala, Finland. ruizhi.chen@fgi.fi
Ling
L
Pei
Jingbin
J
Liu
Robert
R
Guinness
Yuwei
Y
Chen
Heidi
H
Kuusniemi
Ruizhi
R
Chen