INDOOR POSITION LOCATION USING DELAYED SCANNED DIRECTIONAL REFLECTORS
First Claim
1. A positioning system, comprising:
- one or more position reflectors, each of the position reflectors configured to reflect radar signals, each reflected radar signal including a primary reflection delayed by an internal delay of the position reflector;
a server storing reflector data associated with the one or more position reflectors; and
a mobile device configured to receive the reflector data from the server and to transmit a radar signal and process reflections of the transmitted radar to determine a location of the mobile device.
2 Assignments
0 Petitions
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.
306 Citations
30 Claims
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1. A positioning system, comprising:
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one or more position reflectors, each of the position reflectors configured to reflect radar signals, each reflected radar signal including a primary reflection delayed by an internal delay of the position reflector; a server storing reflector data associated with the one or more position reflectors; and a mobile device configured to receive the reflector data from the server and to transmit a radar signal and process reflections of the transmitted radar to determine a location of the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A device for location positioning, the device comprising:
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a radio-frequency front end coupled one or more antennas; and a processor coupled to the radio-frequency front end and configured to supply a radar signal to the radio-frequency front end for transmission, receive, from the radio-frequency front end, signals reflected from one or more position reflectors, and process the received signals to determine a location of the device transmit, the processing including determining a delay from a primary reflection to a secondary reflection. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for location positioning of an electronic device, the method comprising:
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transmitting a direct sequence spread spectrum coded radar signal, the radar signal having a center frequency swept between two frequencies; receiving radar signals that include reflections from a plurality of position reflectors, each of the reflections including a primary reflection delayed by an internal delay of the corresponding position reflector and a secondary reflection further delayed by the internal delay of the corresponding position reflector; correlating information detected in the received radar signals with corresponding information used to form the transmitted radar signal to determine maxima in the reflections; detecting frequency information and delay information about the reflection using the determined maxima in the reflections; determining information about the internal delays of the position reflectors from the delay information; identifying the plurality of position reflectors using the determined internal delay information; determining a range to at least one of the plurality of position reflectors using the detected delay information and the determined internal delay information; determining an angle of arrival for the reflections from at least one of the plurality of position reflectors using the frequency information; and determining the position of the electronic device using the range and the angle of arrival. - View Dependent Claims (30)
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Specification