# US 11,079,482 B2 · Presence detection system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,482 B2 - Document ID: US11079482B2 - Status: Granted - Kind: B2 - Application number: 16/077,340 - Filed: 2017-02-06 - Published: 2019-02-14 - Granted: 2021-08-03 - Earliest claimed: 2016-02-10 - Assignees: Carrier Corporation - Applicants: Carrier Corporation - Inventors: Ziyou Xiong; Cagatay Tokgoz; Joseph Zacchio; Nicholas Charles Soldner; Joseph V. Mantese; Alan Matthew Finn; Mathias Pantus; Jeroen te Paske; Pascal van de Mortel - Web page: https://patentgrep.com/patent/US11079482B2 ## CPC - G01S 13/56: for presence detection {(presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26)} - G01S 7/415: {Identification of targets based on measurements of movement associated with the target} - G01S 13/34: using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal - G01S 13/867: {Combination of radar systems with cameras} - G01S 13/886: {for alarm systems (alarms with electrical actuation G08B13/22)} - G08B 13/19: using infrared-radiation detection systems {(G08B13/194 takes precedence)} - G08B 21/22: responsive to presence or absence of persons - G08B 25/14: Central alarm receiver or annunciator arrangements - 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 - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract A presence detection system includes an infrared detector and a radar detector. A computer processor of the system is configured to receive respective signals from the infrared and radar detectors and process the signals via execution of an algorithm. ## Claims ### Claim 1 A presence detection system comprising: an infrared detector; a radar detector; and a computer processor configured to receive respective signals from the infrared and radar detectors and process the signals via execution of an algorithm, wherein the radar detector includes at least one antenna and a switching module configured to steer the at least one antenna for presence detection, and wherein the radar detector is configured to perform one of an initial presence detection and a presence confirmation, and the infrared detector is configured to perform the other of the initial presence detection and the presence confirmation. ### Claim 2 (depends on 1) The presence detection system set forth in claim 1, wherein the algorithm is a sensor fusion algorithm configured to fuse the respective signals simultaneously. ### Claim 3 (depends on 1) The presence detection system set forth in claim 1, wherein the infrared detector includes a focal plane array including a plurality of radiant energy sensors configured to convert radiant energy into an electrical signal. ### Claim 4 (depends on 1) The presence detection system set forth in claim 1, wherein the radar detector includes a quadrature mixer module configured to communicate with the switching module and the computer processor and output a down-mixed signal, a heartbeat/respiration detector configured to receive the down-mixed signal to distinguish vital signs of a detected presence, and a localization module configured to receive the down-mixed signal to localize the detected presence. ### Claim 5 (depends on 4) The presence detection system set forth in claim 4, wherein the radar detector includes a human presence module configured to receive an output signal from the heartbeat/respiration detector to determine if the detected presence is human. ### Claim 6 (depends on 5) The presence detection system set forth in claim 5, wherein the human presence module is configured to output an affirmative signal to a FMCW mode module of a controller that includes the computer processor, and wherein the FMCW mode module is configured to separate multiple detected presence in space to assist execution of the algorithm by the computer processor to selectively reject presence detections. ### Claim 7 (depends on 6) The presence detection system set forth in claim 6, wherein the human presence module is configured to output a negative signal to the controller if a human presence is not detected. ### Claim 8 (depends on 1) The presence detection system set forth in claim 1, wherein the infrared detector is configured to operate in a sleep mode upon the absence of motion. ### Claim 9 (depends on 1) The presence detection system set forth in claim 1, wherein the radar detector is configured to measure vital signs of a presence. ### Claim 10 (depends on 9) The presence detection system set forth in claim 9, wherein the vital signs include at least one of heartbeat and respiration. ### Claim 11 A presence detection system comprising: an infrared detector; a radar detector; and a computer processor configured to receive respective signals from the infrared and radar detectors and process the signals via execution of an algorithm, wherein the radar detector is configured to perform one of an initial presence detection and a presence confirmation, and the infrared detector is configured to perform the other of the initial presence detection and the presence confirmation.