US 12,153,119 B2
System and method to detect presence using low-cost radar
Ziyou Xiong, Wethersfield, CT (US); Rajeev Dubey, Highland Beach, FL (US); Mateusz Mazur, Sopot (PL); and Michael Ramoutar, Westford, MA (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Nov. 16, 2021, as Appl. No. 17/455,084.
Claims priority of provisional application 63/198,892, filed on Nov. 20, 2020.
Prior Publication US 2022/0163654 A1, May 26, 2022
Int. Cl. G01S 13/56 (2006.01); G01S 7/41 (2006.01); G01S 13/536 (2006.01)
CPC G01S 13/56 (2013.01) [G01S 7/415 (2013.01); G01S 13/536 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for detecting presence using a low-cost radar, the method comprising:
emitting a transmitted signal comprising repetitions of a transmitted signal pattern from a transmitting antenna;
receiving, at one or more receiving antennas, a received signal comprising a combination of a plurality of reflections of the transmitted signal; and
for each received signal:
processing the received signal to determine whether a threshold has been exceeded,
wherein when the received signal exceeds the threshold, determining presence due to a motion from a moving body, and
wherein when the received signal does not exceed the threshold, measuring a periodicity of the received signal to determine whether the periodicity of the received signal is within a vital range, and determining the presence due to a vital sign when the periodicity of the received signal is within the vital range.