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US 6,549,845 B2Granted
Dead reckoning pedometer
AssigneeWestinghouse Savannah River Company
InventorsRobert F. Eakle, Jr., Kenneth J. Hofstetter
Life of this patent
Estimating the term…
Abstract
A system to determine the location of a person within a structure utilizes a magnetometer, magnets, pressure sensors and a CPU to calculate the length and direction of each step. The data may be displayed to the wearer, preferably on a map or floorplan and may be broadcast to persons outside the structure.
Claims10
A dead reckoning pedometer comprising:
- a) a foot pressure sensor attached to each front;
- b) a magnetic point source attached at or near each foot;
- c) a magnetometer attached at or near each foot;
- d) a signal conditioning unit to process signals from each sensor and each magnetometer;
- e) a computer analysis and data storage unit;
- f) means for displaying the results from said computer analysis.
3 more elements
A method for determining the location of a person using a dead reckoning pedometer comprising:
- a) means for determining when each foot is in contact with a supporting surface;
- b) means for determining the position of permanent magnets;
- c) means to calculate the position of said permanent magnets relative to a previous position.
Dependencies are inferred from the claim text.