US 11,867,799 B2
Pulse doppler radar with range resolution
Marat Patotski, Gdansk (PL); and Mateusz Mazur, Gdansk (PL)
Assigned to CARRIER FIRE & SECURITY EMEA BV, Diegem (BE)
Filed by Carrier Fire & Security EMEA BV, Diegem (BE)
Filed on Dec. 8, 2020, as Appl. No. 17/115,515.
Claims priority of application No. 20157419 (EP), filed on Feb. 14, 2020.
Prior Publication US 2021/0255311 A1, Aug. 19, 2021
Int. Cl. G01S 13/88 (2006.01); G01S 13/06 (2006.01); G01S 13/62 (2006.01)
CPC G01S 13/886 (2013.01) [G01S 13/06 (2013.01); G01S 13/62 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of using a radar sensor for a security system to determine a range for a sensed moving object or person, the method comprising:
transmitting, from the radar sensor, a plurality of radar pulses and, when the object or person is present to reflect the radar pulses, receiving a corresponding plurality of pulses, the transmitting and receiving comprising:
transmitting a first radar pulse having a first defined pulse duration;
receiving a first reflected radar pulse, wherein the first reflected radar pulse is at least a portion of the first radar pulse that has reflected off of the object or person;
determining, at the radar sensor, whether there is a first pulse overlap between the first radar pulse and the first reflected radar pulse;
selecting a second defined pulse duration for a second radar pulse based on the determination of the first pulse overlap;
transmitting the second radar pulse having the second pulse duration;
receiving a second reflected radar pulse, wherein the second reflected radar pulse is at least a portion of the second radar pulse that has reflected off of the object or person; and
determining, at the radar sensor, whether there is a second pulse overlap between the second radar pulse and the second reflected radar pulse; and
determining a range in which the object or person is located based on the determinations of the first pulse overlap and the second pulse overlap.