# US 10,870,413 B2 · Signal direction detection based vehicle remote entry control method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,413 B2 - Document ID: US10870413B2 - Status: Granted - Kind: B2 - Application number: 16/363,416 - Filed: 2019-03-25 - Published: 2020-10-01 - Granted: 2020-12-22 - Earliest claimed: 2019-03-25 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Kabushiki Kaisha Toshiba - Inventors: Ziming Zhu; Zubeir Bocus - Web page: https://patentgrep.com/patent/US10870413B2 ## CPC - B60R 25/245: {where the antenna reception area plays a role} - G01S 3/74: Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals (systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14) - G01S 5/0221: {Receivers} - G01S 5/08: Position of single direction-finder fixed by determining direction of a plurality of spaced sources of known location - G07C 9/00309: {operated with bidirectional data transmission between data carrier and locks} - B60R 2325/205: Mobile phones - G07C 2009/00507: {keyless data carrier having more than one function} - G07C 2209/63: Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - 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 - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE ## Abstract A method of remotely controlling access to a resource comprising: transmitting a plurality of signals wherein each signal is transmitted using a different antenna from a plurality of antennas, detecting a received signal at a remote key, performing angle-of-arrival analysis on the received signal; and transmitting an authorisation message from the remote key if the received signal comprises a plurality of signal components with a predetermined characteristic. ## Claims ### Claim 1 A method of remotely controlling access to a resource, the method comprising: transmitting a first signal including a request for authorization message via a first antenna; transmitting a second signal including an interference signal uncorrelated with the first signal via a second antenna different from the first antenna; receiving the first signal and the second signal at a remote key; performing angle-of-arrival analysis on the first signal received; performing angle-of-arrival analysis on the second signal received; and transmitting the authorization message from the remote key when the first signal received and the second signal received comprise a plurality of signal components separated by a predetermined angle more than a threshold. ### Claim 2 (depends on 1) The method according to claim 1, wherein the method further comprises receiving the authorization message and unlocking access to the resource when the remote key is authorized. ### Claim 3 (depends on 2) The method according to claim 2, wherein a number of the signal components equals a number of signals in transmitted signals. ### Claim 4 (depends on 3) The method according to claim 3, wherein the performing angle-of-arrival analysis comprises: determining an angle-of-arrival spectrum of the first signal received and the second signal received for a predetermined range of angles; and identifying peaks in the angle-of-arrival spectrum. ### Claim 5 (depends on 4) The method according to claim 4, wherein the first signal received and the second signal received have the predetermined angle when the angle-of-arrival spectrum comprises: a number of peaks separated by at least the predetermined angle; wherein the number of peaks equals the number of signals in the transmitted signals. ### Claim 6 (depends on 1) The method according to claim 1, wherein the predetermined angle is based on: a distance between the first antenna and the second antenna; and a maximum range from which the resource is unlocked. ### Claim 7 (depends on 6) The method according to claim 6, wherein the first antenna is located at a front of a vehicle and the second antenna is located at a rear of the vehicle. ### Claim 8 A remote key comprising: a plurality of antennas; and a processor configured to: receive a first signal including a request for an authorization message via a first antenna; receive a second signal including an interference signal uncorrelated with the first signal via a second antenna different from the first antenna; perform angle-of-arrival analysis on the first signal received; perform angle-of-arrival analysis on the second signal received; and transmit the authorization message when the first signal received and the second signal received comprise a plurality of signal components separated by a predetermined angle more than a threshold. ### Claim 9 (depends on 8) The remote key according to claim 8, wherein the authorization message is configured to unlock access to a resource when the remote key is associated with an authorized user. ### Claim 10 (depends on 9) The remote key according to claim 9, wherein a number of the signal components equals a number of signals transmitted by a control unit. ### Claim 11 (depends on 10) The remote key according to claim 10, wherein the performing angle-of-arrival analysis comprises: determining an angle-of-arrival spectrum of the first signal received and the second signal received for a predetermined range of angles; and identifying peaks in the angle-of-arrival spectrum. ### Claim 12 (depends on 11) The remote key according to claim 11, wherein the first signal received and the second signal received have the predetermined angle when the angle-of-arrival spectrum comprises: a number of peaks separated by at least the predetermined angle; wherein the number of peaks equals the number of signals transmitted by the control unit. ### Claim 13 (depends on 12) The remote key according to claim 12, wherein the authorization message comprises a sender identification number. ### Claim 14 (depends on 13) The remote key according to claim 13, wherein the number of peaks equals two and the predetermined angle is based on: a distance between a first signal source of a first peak and a second signal source of a second peak; and a maximum range from the first signal source to the second signal source wherein the resource is unlocked from the maximum range. ### Claim 15 A control unit for remote key entry comprising: a first antenna and a second antenna; a control output configured to unlock access to a resource; and a processor configured to: transmit a first signal including a request for authorization message via the first antenna; transmit a second signal including an interference signal uncorrelated with the first signal via the second antenna different from the first antenna; receive the authorization message from a remote key when the remote key determines the first signal transmitted and the second signal transmitted comprise a plurality of signal components separated by a predetermined angle more than a threshold; and instruct the control output to unlock access to the resource when the authorization message was transmitted by an authorized user. ### Claim 16 (depends on 15) The control unit according to claim 15, wherein the first antenna is located at a front of a vehicle and the second antenna is located at a rear of the vehicle. ### Claim 17 (depends on 16) The control unit according to claim 16, wherein the authorization message comprises a sender identification number and wherein the processor instructs the control output to unlock access to the resource when the sender identification number is associated with an authorized user.