# US 11,307,301 B2 · Location detection system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,301 B2 - Document ID: US11307301B2 - Status: Granted - Kind: B2 - Application number: 16/727,867 - Filed: 2019-12-26 - Published: 2020-08-06 - Granted: 2022-04-19 - Earliest claimed: 2019-02-01 - Assignees: RichWave Technology Corp. - Applicants: RichWave Technology Corp. - Inventors: Chiang-Hua Yeh - Web page: https://patentgrep.com/patent/US11307301B2 ## CPC - G01S 13/46: Indirect determination of position data - G01S 13/584: {adapted for simultaneous range and velocity measurements} - G01S 7/354: {Extracting wanted echo-signals (Doppler systems G01S13/50)} - G01S 13/04: Systems determining presence of a target (based on relative movement of target G01S13/56) - G01S 13/536: using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves - G01S 13/878: {Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector (G01S13/874 takes precedence)} - G01S 13/88: Radar or analogous systems specially adapted for specific applications (electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00) - G01S 2013/468: {by Triangulation, i.e. two antennas or two sensors determine separately the bearing, direction or angle to a target, whereby with the knowledge of the baseline length, the position data of the target is determined} - 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 ## Abstract A location detection system includes a first directional radar sensor, a second directional radar sensor and a controller. The first directional radar sensor has a first facing direction and a first radio coverage correspondingly, and is used to receive a first response signal upon detecting an object. The second directional radar sensor has a second facing direction and a second radio coverage correspondingly, the second radio coverage being partially overlapping with the first radio coverage, and is used to receive a second response signal upon detecting the object. The controller is used to determine which region the object is located in according to receptions of the first response signal and the second response signal. ## Claims ### Claim 1 A location detection system, comprising: a first directional radar sensor having a first facing direction and a first radio coverage correspondingly, and configured to receive a first response signal upon detecting an object; a second directional radar sensor having a second facing direction and a second radio coverage correspondingly, and configured to receive a second response signal upon detecting the object, the second radio coverage being partially overlapping with the first radio coverage; and a controller configured to determine which region the object is located in according to receptions of the first response signal and/or the second response signal, wherein the region is selected from at least one overlapping region and at least two non-overlapping regions, and the at least one overlapping region comprises an overlapping area formed by the first radio coverage and the second radio coverage, and wherein the controller determines that the object is located in one of the at least two non-overlapping regions when receiving the first response signal but not the second response signal, or when receiving the second response signal but not the first response signal. ### Claim 2 (depends on 1) The location detection system of claim 1, wherein the controller determines that the object is located in the at least one overlapping region when receiving the first response signal and the second response signal. ### Claim 3 (depends on 1) The location detection system of claim 1, wherein the first directional radar sensor and the second directional radar sensor are arranged next to each other so that the first facing direction and the second facing direction are different and coplanar. ### Claim 4 (depends on 3) The location detection system of claim 3, wherein the first facing direction and the second facing direction are orthogonal. ### Claim 5 (depends on 1) The location detection system of claim 1, further comprising: a third directional radar sensor having a third facing direction and a third radio coverage correspondingly, and configured to receive a third response signal upon detecting the object, the third radio coverage is partially overlapping with the second radio coverage; wherein the controller is configured to determine which region the object is located in according to receptions of the first response signal, the second response signal and/or the third response signal. ### Claim 6 (depends on 5) The location detection system of claim 5, wherein the region the object is located in is selected from at least two overlapping regions and at least two non-overlapping regions, and wherein the at least two overlapping regions comprise the overlapping area formed by the first radio coverage and the second radio coverage and further comprise an overlapping area formed by the second radio coverage and the third radio coverage overlap. ### Claim 7 (depends on 5) The location detection system of claim 5, wherein the first directional radar sensor, the second directional radar sensor and the third directional radar sensor are arranged next to each other so that the first facing direction, the second facing direction and the third facing direction are different and coplanar. ### Claim 8 (depends on 5) The location detection system of claim 5, wherein the first facing direction and the second facing direction are orthogonal, and the second facing direction and the third facing direction are orthogonal. ### Claim 9 (depends on 5) The location detection system of claim 5, wherein the third radio coverage does not overlap with the first radio coverage, and the controller determines which region the object is located in when receiving the second response signal and one of the first response signal and the third response signal. ### Claim 10 (depends on 5) The location detection system of claim 5, wherein the first facing direction and the second facing direction are orthogonal, and the second facing direction and the third facing direction form an acute angle. ### Claim 11 (depends on 10) The location detection system of claim 10, wherein the region the object is located in is selected from at least three overlapping regions and at least two non-overlapping regions; and wherein the at least three overlapping regions comprise the overlapping area formed by the first radio coverage and the second radio coverage, an overlapping area formed by the second radio coverage and the third radio coverage, and an overlapping area formed by the third radio coverage and the first radio coverage. ### Claim 12 (depends on 10) The location detection system of claim 10, wherein the third radio coverage is partially overlapping with the first radio coverage, and the controller determines which region the object is located in when receiving at least the first response signal and the second response signal, or when receiving the second response signal but not the first response signal and the third response signal. ### Claim 13 (depends on 12) The location detection system of claim 12, wherein a maximum radio range of the first radio coverage is smaller than a maximum radio range of the second radio coverage and a maximum radio range of the third radio coverage. ### Claim 14 (depends on 13) The location detection system of claim 13, wherein the acute angle is tan - 1 ⁢ y 2 - x 2 x , and the direction the third facing direction is outside of the first radio coverage; wherein x is a maximum radio range of the first directional radar sensor, and y is a maximum radio range of the second directional radar sensor. ### Claim 15 (depends on 10) The location detection system of claim 10, wherein the acute angle is tan - 1 ⁢ x y 2 - x 2 , and the third facing direction is outside of the first radio coverage; wherein x is a maximum radio range of the first directional radar sensor, and y is a maximum radio range of the second directional radar sensor. ### Claim 16 (depends on 10) The location detection system of claim 10, wherein the third radio coverage is partially overlapping with the first radio coverage, and the controller determines which region the object is located in when receiving at least the second response signal and the third response signal, or when receiving the first response signal and the second response signal but not the third response signal. ### Claim 17 (depends on 16) The location detection system of claim 16, wherein a maximum radio range of the first radio coverage is smaller than a maximum radio range of the second radio coverage and a maximum radio range of the third radio coverage. ### Claim 18 (depends on 1) The location detection system of claim 1 wherein the first directional radar sensor and the second directional radar sensor have a same maximum radio range. ### Claim 19 (depends on 1) The location detection system of claim 1, wherein the first directional radar sensor and the second directional radar sensor are frequency-modulated continuous wave radar sensors.