US 12,136,308 B2
Ultra-wide band radar for tailgating detection in access control systems
Hans-Juergen Pirch, Feldkirchen (AT); and Sylvain Jacques Prevost, Austin, TX (US)
Assigned to ASSA ABLOY AB, Stockholm (SE)
Appl. No. 17/995,224
Filed by ASSA ABLOY AB, Stockholm (SE)
PCT Filed Mar. 3, 2021, PCT No. PCT/EP2021/055286
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/204467, PCT Pub. Date Oct. 14, 2021.
Claims priority of provisional application 63/008,252, filed on Apr. 10, 2020.
Prior Publication US 2023/0186704 A1, Jun. 15, 2023
Int. Cl. G07C 9/15 (2020.01); G01S 7/41 (2006.01); G01S 13/02 (2006.01); G01S 13/76 (2006.01)
CPC G07C 9/15 (2020.01) [G01S 7/411 (2013.01); G01S 13/0209 (2013.01); G01S 13/765 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A reader device of a physical access control system (PACS), the reader device comprising:
an ultra-wide band (UWB) physical layer; and
processing circuitry operatively coupled to the UWB physical layer and configured to:
receive access credential information from a separate second device;
use two-way ranging to receive ranging information from the second device using the UWB physical layer;
grant access through a physical portal according to the access credential information and ranging information;
use one-way signaling to transmit a UWB signal using the UWB physical layer, wherein the transmitted UWB signal includes a specified pattern of radio frequency (RF) signal pulses;
receive a reflected signal using the UWB physical layer that corresponds to the transmitted UWB signal reflecting off one or more objects;
determine a number of people intending to pass through the physical portal using the reflected signal; and
generate an indication according to the determined number of people.