Barometric floor level indicator
First Claim
1. A navigation device for providing a floor number of a structure, comprising:
- a radio frequency navigation receiver providing position information;
an altimeter providing elevation information; and
a processor communicatively coupled to the radio frequency navigation receiver to receive the position information and communicatively coupled to the altimeter to receive elevation information, the processor configured todetect if radio frequency navigation receiver has stopped providing reliable position information,if it is determined that the radio frequency navigation receiver has stopped providing reliable position information, the processorstores the most recent elevation information from the altimeter and associates it as a reference elevation,associates the reference elevation with an entry floor,monitors the altimeter information for a current elevation,determines a change in elevation between the current elevation and the reference elevation,divides the change in elevation by a nominal floor height to determine a floor number, andprovides the floor number to a user.
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Accused Products
Abstract
The invention relates to a device, system, and method for providing a multi-mode navigation device. In a first mode of operation, the navigation device provides position information based on a radio frequency navigation signals. If radio signals become unavailable, the navigation device enters a second mode of operation. In the second mode of operation the navigation device stores the most recent elevation and associates it with a reference elevation, the reference elevation is associated with an entry floor. The difference between a current elevation and the reference elevation is determined and this difference is divided by a floor height to obtain a floor number. The navigation device provides the floor number while reliable global position information is unavailable.
171 Citations
21 Claims
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1. A navigation device for providing a floor number of a structure, comprising:
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a radio frequency navigation receiver providing position information; an altimeter providing elevation information; and a processor communicatively coupled to the radio frequency navigation receiver to receive the position information and communicatively coupled to the altimeter to receive elevation information, the processor configured to detect if radio frequency navigation receiver has stopped providing reliable position information, if it is determined that the radio frequency navigation receiver has stopped providing reliable position information, the processor stores the most recent elevation information from the altimeter and associates it as a reference elevation, associates the reference elevation with an entry floor, monitors the altimeter information for a current elevation, determines a change in elevation between the current elevation and the reference elevation, divides the change in elevation by a nominal floor height to determine a floor number, and provides the floor number to a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for providing a floor number of a structure, comprising:
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detecting whether global position information becomes unavailable; if global position information is unavailable, then storing the most recent elevation and associating it with a reference elevation; associating the reference elevation with an entry floor; determining a change in elevation between a current elevation and the reference elevation; dividing the change in elevation by a floor height to determine a floor number relative to the entry floor; and providing the floor number to a user while reliable global position information is unavailable. - View Dependent Claims (15, 16, 17)
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18. A machine-readable medium comprising at least one instruction to provide floor number information of a structure if global positioning system information is unavailable, which when executed by a processor, causes the processor to perform operations comprising:
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detecting whether global position information becomes unavailable; if global position information is unavailable, then associating the most recent elevation with a reference elevation; determining a change in elevation between a current elevation and the reference elevation; dividing the change in elevation by a floor height to determine a floor number relative to the reference elevation; and providing the floor number to a user while reliable global position information is unavailable. - View Dependent Claims (19, 20, 21)
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Specification