G - Physics – 01 – P
Patent
G - Physics
01
P
G01P 13/00 (2006.01) G01C 21/18 (2006.01)
Patent
CA 2179464
An apparatus and method for sensing motionlessness for sensing motionlessness in a land-based vehicle is provided. The apparatus can include an inertial measurement unit (IMU) mounted in a predetermined orientation on the vehicle and a programmable computer. The IMU can have an inertial sensor which generates a plurality of motion signals. More than one inertial sensor can be used and, in that case, each of the sensors can be mounted in a second predetermined orientation with respect to the others, such as an orthogonal orientation, thereby creating a selected spatial reference frame. The inertial sensor can be one or more accelerometers, or one or more gyroscopes, or an accelerometer-gyroscope combination. The computer receives the motion signals and determining a motion state of the vehicle therefrom. The computer provides the motion state to a target application which acts in accordance therewith. The method can include sensing a reference sample of motion signals during a reference period; extracting a reference characteristic signal from the reference sample; sensing an operational sample during an operational period; extracting an operational characteristic signal from the operational sample; determining the current motion state by comparing the operational characteristic signal to the reference characteristic signal; reporting the motion state to a target application in the vehicle, the application acting in accordance therewith.
Macrae & Co.
Union Switch & Signal Inc.
LandOfFree
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