| US 7,467,060 B2 | ||
| Method and apparatus for estimating a motion parameter | ||
| Christopher J. Kulach, Calgary (Canada); James K. Rooney, Cochrane (Canada); and Paul R. MacDonald, Calgary (Canada) | ||
| Assigned to Garmin Ltd., (Cayman Islands) | ||
| Filed on Mar. 01, 2007, as Appl. No. 11/681,032. | ||
| Claims priority of provisional application 60/778793, filed on Mar. 03, 2006. | ||
| Prior Publication US 2007/0208544 A1, Sep. 06, 2007 | ||
| Int. Cl. G04F 10/00 (2006.01) | ||
| U.S. Cl. 702—141 [702/160; 702/182; 702/176; 73/490; 73/514.01] | 11 Claims |
| 1. A method of estimating a motion parameter corresponding to a subject element in cyclical motion, the method comprising:
acquiring an acceleration measurement corresponding to at least one motion cycle;
determining a stride duration using the acceleration measurement;
low-pass filtering the acceleration measurement utilizing a cut-off frequency between about 0.5 Hz and 10 Hz:
calculating an acceleration magnitude using the filtered acceleration measurement;
for each motion cycle, generating a motion parameter metric utilizing the stride duration and acceleration magnitude; and
estimating the motion parameter using the motion parameter metric.
|