Title :
A study of the ambiguity problem in footstep bearing estimation using tri-axial geophone
Author :
Venkatraman, Divya ; Reddy, Vinod ; Khong, Andy W H
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
This paper investigates the ambiguities that exist in the bearing estimate of human footstep signals acquired using a single tri-axial geophone. Estimated angles for a series of footsteps from three different walking patterns are evaluated. It is observed that there are two kinds of ambiguities, viz., energy and wave polarization. A systematic study of these ambiguities are presented using covariance matrix analysis (CMA) as the base algorithm. Existing techniques to resolve these ambiguities are analysed with their limitations.
Keywords :
covariance matrices; gait analysis; seismometers; signal processing; ambiguity problem; angle estimation; covariance matrix analysis; footstep bearing estimation; human footstep signal; tri-axial geophone; walking pattern evaluation; Azimuth; Covariance matrix; Direction of arrival estimation; Indexes; Legged locomotion; Sensors; Surface waves;
Conference_Titel :
Information, Communications and Signal Processing (ICICS) 2011 8th International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4577-0029-3
DOI :
10.1109/ICICS.2011.6173512
