Method and System For Determining The Altitude of a Mobile Wireless Device
First Claim
1. A method for constructing a database for locating a device in three dimensional space, the method comprising:
- identifying, in three dimensional space, a plurality of locations comprising an X coordinate, a Y coordinate, and a respective plurality of Z coordinates, wherein the plurality of Z coordinates correspond to a respective plurality of altitudes;
receiving, at a first reception site, a plurality of signals, each signal of the plurality of signals being indicative of a mobile device being positioned at a respective location of the plurality of locations;
determining a metric for each signal of the plurality of signals received at the first reception site; and
constructing the database comprising, for each of the plurality of locations, the X coordinate, the Y coordinate, a respective Z coordinate, and a respective metric.
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Accused Products
Abstract
A method and system for determining the three-dimensional location of a mobile wireless device. In one implementation, the device is a cellular telephone making a 911 call from one floor of a multi-story building. An embodiment of the method of the invention includes establishing a database that associates transmission metrics with altitudes of x-y coordinate locations having more than one altitude at which the mobile wireless device could be located, receiving a communication from the mobile wireless device, determining an x-y coordinate location of the mobile wireless device, measuring a transmission metric of the mobile wireless device, and consulting the database to determine the altitude from the x-y coordinate location and the measured transmission metric. The transmission metric could be, for example, the transmission time or angle of arrival of a wireless signal received from the mobile wireless device.
17 Citations
18 Claims
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1. A method for constructing a database for locating a device in three dimensional space, the method comprising:
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identifying, in three dimensional space, a plurality of locations comprising an X coordinate, a Y coordinate, and a respective plurality of Z coordinates, wherein the plurality of Z coordinates correspond to a respective plurality of altitudes; receiving, at a first reception site, a plurality of signals, each signal of the plurality of signals being indicative of a mobile device being positioned at a respective location of the plurality of locations; determining a metric for each signal of the plurality of signals received at the first reception site; and constructing the database comprising, for each of the plurality of locations, the X coordinate, the Y coordinate, a respective Z coordinate, and a respective metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-readable storage medium having computer-executable instructions stored thereon that when executed by a processor perform a method for constructing a database for locating a device in three dimensional space, the method comprising:
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identifying, in three dimensional space, a plurality of locations comprising an X coordinate, a Y coordinate, and a respective plurality of Z coordinates, wherein the plurality of Z coordinates correspond to a respective plurality of altitudes; receiving, at a first reception site, a plurality of signals, each signal of the plurality of signals being indicative of a mobile device being positioned at a respective location of the plurality of locations; determining a metric for each signal of the plurality of signals received at the first reception site; and constructing the database comprising, for each of the plurality of locations, the X coordinate, the Y coordinate, a respective Z coordinate, and a respective metric. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification