# US 10,310,069 B2 · Indoor position location using delayed scanned directional reflectors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,069 B2 - Document ID: US10310069B2 - Status: Granted - Kind: B2 - Application number: 15/200,785 - Filed: 2016-07-01 - Published: 2017-05-11 - Granted: 2019-06-04 - Earliest claimed: 2014-08-25 - Assignees: Lonprox Corporation - Applicants: Younis Technologies, Inc. - Inventors: Saed G. Younis - Web page: https://patentgrep.com/patent/US10310069B2 ## CPC - G01S 13/876: {Combination of several spaced transponders or reflectors of known location for determining the position of a receiver (G01S13/874 takes precedence)} - G01S 13/426: {Scanning radar, e.g. 3D radar (G01S13/66 takes precedence)} - G01S 13/753: {using frequency selective elements, e.g. resonator} - G01S 13/755: {using delay lines, e.g. acoustic delay lines} - G01S 13/756: {using a signal generator for modifying the reflectivity of the reflector (G01S13/758 takes precedence)} - G01S 13/758: {using a signal generator powered by the interrogation signal} - G01S 13/867: {Combination of radar systems with cameras} - H01Q 15/14: Reflecting surfaces; Equivalent structures {(electromagnetic shields H01Q1/526)} - H01Q 15/18: comprising plurality of mutually inclined plane surfaces, e.g. corner reflector {(H01Q15/16 takes precedence)} - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## 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. ## Claims ### 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, and transmit at least a portion of the reflector data to the mobile device based on the coarse position information. ### Claim 2 (depends on 1) The positioning system of claim 1, wherein each reflected signal further includes a second reflection delayed from the primary reflection by an integer multiple of the internal delay of the position reflector. ### Claim 3 (depends on 2) The positioning system of claim 2, wherein the reflector data stored by the one or more servers includes: locations of the plurality of position reflectors; orientations of the plurality of position reflectors; internal delays of the plurality of position reflectors; delays from primary to secondary reflections of the plurality of position reflectors; power levels of the primary and secondary reflections of the plurality of position reflectors; and frequency characteristics of the plurality of position reflectors. ### Claim 4 (depends on 1) The positioning system of claim 1, wherein the one or more servers are configured to control radiation power, bandwidth, duration, and center frequency of the coded signal transmitted by the mobile device. ### Claim 5 (depends on 1) The positioning system of claim 1, wherein at least one of the plurality of position reflectors comprises: an antenna; a delay element; and a matching network coupling the antenna to the delay element, the matching network transforming an impedance of the antenna to an impedance of the delay element. ### Claim 6 (depends on 5) The positioning system of claim 5, wherein the matching network mismatches the impedance of the antenna to the impedance of the delay element thereby causing a secondary reflection from the position reflector. ### Claim 7 (depends on 1) The positioning system of claim 1, wherein at least one of the plurality of position reflectors comprises: an antenna; a delay element; a circulator having a first terminal for coupling to the antenna, a second terminal coupled to a first terminal of the delay element, and a third terminal coupled to a second terminal of the delay element; and a matching network coupling the antenna to the circulator, the matching network transforming an impedance of the antenna to an impedance of the delay element. ### Claim 8 (depends on 1) The positioning system of claim 1, wherein at least one of the plurality of position reflectors comprises: an array of antennas; a plurality of transmission paths sequentially coupling the array of the antennas; a delay element; and a matching network coupling a first one of the plurality of transmission paths to the delay element, the matching network transforming an impedance of the array of antennas to an impedance of the delay element. ### Claim 9 A method for mobile device indoor position determination, the method comprising: 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. ### Claim 10 (depends on 9) The method of claim 9, wherein the coded signal is modulated with direct sequence spread spectrum (DSSS) modulation. ### Claim 11 (depends on 9) The method of claim 9, wherein reflecting the reflected signal to the mobile device further includes a second reflection delayed from the primary reflection by an integer multiple of the internal delay of the position reflector. ### Claim 12 (depends on 9) The method of claim 9, wherein the reflector data stored by the server includes: locations of the plurality of position reflectors; orientations of the plurality of position reflectors; internal delays of the plurality of position reflectors; delays from primary to secondary reflections of the plurality of position reflectors; power levels of the primary and secondary reflections of the plurality of position reflectors; and frequency characteristics of the plurality of position reflectors. ### Claim 13 (depends on 9) The method of claim 9 further comprising, controlling, by the server, radiation power, bandwidth, duration, and center frequency of the coded signal transmitted by the mobile device. ### Claim 14 (depends on 9) The method of claim 9, wherein at least one of the plurality of position reflectors comprises: an antenna; a delay element; and a matching network coupling the antenna to the delay element, the matching network transforming an impedance of the antenna to an impedance of the delay element. ### Claim 15 (depends on 14) The method of claim 14, wherein the matching network mismatches the impedance of the antenna to the impedance of the delay element thereby causing a secondary reflection from the position reflector. ### Claim 16 (depends on 9) The method of claim 9, wherein at least one of the plurality of position reflectors comprises: an antenna; a delay element; a circulator having a first terminal for coupling to the antenna, a second terminal coupled to a first terminal of the delay element, and a third terminal coupled to a second terminal of the delay element; and a matching network coupling the antenna to the circulator, the matching network transforming an impedance of the antenna to an impedance of the delay element. ### Claim 17 (depends on 9) The method of claim 9, wherein at least one of the plurality of position reflectors comprises: an array of antennas; a plurality of transmission paths sequentially coupling the array of the antennas; a delay element; and a matching network coupling a first one of the plurality of transmission paths to the delay element, the matching network transforming an impedance of the array of antennas to an impedance of the delay element.