Indoor position location using delayed scanned directional reflectors
First Claim
1. A positioning system, comprising:
- a plurality of position reflectors, each of the position reflectors configured to reflect coded signals transmitted by the mobile device as reflected signals, each reflected radar signal including a primary reflection delayed by an internal delay of the position reflector; and
one or more servers having reflector data associated with the plurality of position reflectors and configured to,receive coarse position information of a mobile device, the coarse position information indicating an approximate location of the mobile device, andtransmit at least a portion of the reflector data to the mobile device based on the coarse position information.
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Accused Products
Abstract
A mobile device determines its location accurately by measuring the range to a position reflector as well as azimuth and elevation angles of arrival (AOA) at the reflector. The mobile can transmit a coded radar signal and process reflections to determine its location. The reflectors may include internal delays that can identify the reflector and provide transmit/receive separation for the mobile. The reflection can include a primary and further delayed secondary reflection. The mobile can determine the internal delay of the reflector based on the delay between primary and secondary reflections. The range and AOA information can be combined with information about the position, orientation, and characteristics of the reflectors to determine location. In some systems, the mobile device can determine its location in a three-dimensional space using reflections from only one reflector. The reflectors, which can be economically produced, can be unpowered and low profile for easy installation.
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Citations
17 Claims
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1. A positioning system, comprising:
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a plurality of position reflectors, each of the position reflectors configured to reflect coded signals transmitted by the mobile device as reflected signals, each reflected radar signal including a primary reflection delayed by an internal delay of the position reflector; and one or more servers having reflector data associated with the plurality of position reflectors and configured to, receive coarse position information of a mobile device, the coarse position information indicating an approximate location of the mobile device, and transmit at least a portion of the reflector data to the mobile device based on the coarse position information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for mobile device indoor position determination, the method comprising:
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storing reflector data associated with a plurality of position reflectors at a server; receiving coarse position information of a mobile device at the server; transmitting, from the server, at least a portion of the reflector data to the mobile device based on the coarse position information; receiving, at a position reflector of the plurality of position reflectors, a coded signal from a mobile device; and reflecting the coded signal transmitted by the mobile device as reflected signals, each reflected signal including a primary reflection delayed by an internal delay of the position reflector. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification