Athlete speed prediction method using data from attached inertial measurement unit

摘要

An apparatus and method for calculating athlete speed non-invasively, on the field/court of play using data from a torso-mounted inertial measurement unit. The method complements existing, GPS-based methods for calculating athlete speed by enabling use in environments where GPS signal is unavailable (i.e. indoors).

主权项

1. A method for non-invasively obtaining velocity information of a subject, said method comprising:
attaching an inertial measurement unit to the subject, said inertial measurement unit providing three-axis sensing of angular velocity and linear acceleration of the subject and outputting angular velocity and linear acceleration data; obtaining said angular velocity and linear acceleration data associated with said angular velocity and linear acceleration of the subject from said inertial measurement unit at a first time, the subject being stationary at said first time; calculating a drift error of a velocity of the subject as a function of time in response to said angular velocity and linear acceleration data at said first time; obtaining angular velocity and linear acceleration data associated with said angular velocity and linear acceleration of the subject from said inertial measurement unit at a second time, the subject being non-stationary at said second time; calculating a corrected velocity of the subject at said second time in response to said drift error and said angular velocity and linear acceleration data at said second time; and outputting said corrected velocity, wherein said calculating a corrected velocity of the subject at said second time in response to said drift error comprises calculating a corrected velocity according to the following equation:
{right arrow over (ν)}c={right arrow over (ν)}−{right arrow over (ƒ)}(t) where {right arrow over (ν)} is an uncorrected subject velocity calculated from said measured angular velocity and linear acceleration, {right arrow over (ν)}c is said corrected velocity of the subject, and {right arrow over (ƒ)}(t) is a vector function in time of said drift error.