US 12,474,466 B2
Locating a mobile radio-enabled tag
Andrew Paul George Randall, Newbury (GB); David Ian Belcher, Wantage (GB); Alastair Bryers, Cholsey (GB); and Andrew James Maxim, Andover (GB)
Assigned to Entotem Limited, Derby (GB)
Filed by Entotem Limited, Derby (GB)
Filed on Apr. 25, 2023, as Appl. No. 18/139,307.
Claims priority of application No. 2206308 (GB), filed on Apr. 29, 2022.
Prior Publication US 2023/0350052 A1, Nov. 2, 2023
Int. Cl. G01S 13/87 (2006.01)
CPC G01S 13/878 (2013.01) 16 Claims
OG exemplary drawing
 
1. A method of locating a mobile radio-enabled tag, comprising steps of:
identifying a vicinity of said mobile radio-enabled tag in a radio network having fixed radio transceivers using a first radio protocol, in which said fixed radio transceivers continually perform return time of flight ranging exchanges with a plurality of mobile radio-enabled tags in an environment to determine distances between each of said plurality of mobile radio-enabled tags and a plurality of said fixed radio transceivers;
uploading said distances using said first radio protocol; and
locating a position of said mobile radio-enabled tag in said vicinity by means of a portable radio receiver using a measurement of signal strength of a second radio protocol, in which a message issued to said mobile radio-enabled tag to locate is instructed by a fixed radio transceiver under said first radio protocol to broadcast a location signal in accordance with said second radio protocol,
wherein said position is located by measuring a signal strength of said location signal.