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US 10,368,783 B2Granted
Position determination system
AssigneeSonitor Technologies AS
InventorsWilfred Edwin Booij, Oystein Haug Olsen
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Abstract
A monitoring system is provided that includes a three dimensional position determination system for determining the three dimensional coordinates of one or more mobile units. The system includes at least one zone in which the system is arranged to raise an alarm when the rate of change of a vertical coordinate of a mobile unit is less than a predetermined value.
Claims18
A monitoring system, comprising:
- one or more mobile units;
- and
- a three dimensional position determination system arranged to determine three dimensional coordinates of the one or more mobile units, said system comprising at least two zones;
- wherein the system is arranged to determine which zone a selected one of the one or more mobile units is in based on its horizontal position;
- and
- wherein in one of said zones the system is arranged to raise an alarm when the rate of change of a vertical coordinate of the selected one of the one or more mobile units is less than a predetermined value;
- and
- wherein the position determination system comprises one or more fixed base units, wherein the system is arranged to determine the horizontal position of a mobile unit of the one or more mobile units based on the proximity of said mobile unit to at least one base unit and wherein the system is arranged to determine the height of said mobile unit based on the air pressure sensed at the mobile unit and the air pressure sensed at one or more of the base units.
5 more elements
Dependencies are inferred from the claim text.