APPARATUS AND METHOD FOR ESTIMATING WAKING STATUS FOR STEP LENGTH ESTIMATION USING PORTABLE TERMINAL

• Main Authors: SHIN, SEUNG HYUCK, JUNG, YUNG KEUN, HONG, HYUN SU, PARK, CHAN GOOK, LEE, MIN SU, LEE, JAE MYEON
• Format: Patent
• Language: English; Korean
• Published: 05.01.2012
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING; WIRELESS COMMUNICATIONS NETWORKS

PURPOSE: A waking state estimating apparatus and method for estimation of step length using a portable terminal are provided to improve the accuracy of step length estimation in a portable terminal. CONSTITUTION: A waking state estimating method for estimation of step length using a portable terminal comprises a step(505) of setting an observation row using estimated temporary step length, acceleration distribution, and step frequency, a step of creating an observation probability vector, which includes probabilities according to walking state based on the observation row, a step of calculating the final probabilities according to walking state by multiplying the observation probability vector by one or more of state transition probability vectors, a step(507) of determining a walking state having the maximum final probability as the final walking state, and a step(509) of estimating the temporary step length using integral parameters.