US 12,222,417 B2
Radio frequency life detection radar system
Hossein Ghaffari Nik, Fairfax, VA (US); and Desmond A. Fraser, Oak Hill, VA (US)
Filed by Rhein Tech Laboratories, Inc., Herndon, VA (US)
Filed on Jul. 26, 2022, as Appl. No. 17/873,608.
Application 17/873,608 is a continuation in part of application No. 17/076,769, filed on Oct. 21, 2020, granted, now 11,397,241.
Claims priority of provisional application 62/924,110, filed on Oct. 21, 2019.
Prior Publication US 2023/0029235 A1, Jan. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 13/88 (2006.01); G01S 7/41 (2006.01); G01S 13/58 (2006.01)
CPC G01S 13/88 (2013.01) [G01S 7/415 (2013.01); G01S 13/584 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for detecting movement of a trapped or confined individual comprising:
rotating a co-located antenna of a receiver and rotating a co-located antenna of a transmitter to a plurality of different antenna positions and antenna polarities;
transmitting a first set of modulated, radio frequency (RF) signals towards the trapped or confined individual from the transmitter connected to the transmitting, rotating antenna at a first antenna position of the plurality of antenna positions using the antenna polarities and a first RF signal profile comprising different modulation types;
receiving reflected signals from the trapped or confined individual at the rotating receiver connected to the receiving, rotating antenna corresponding to the first set of modulated RF signals;
further transmitting one or more next sets of modulated, RF signals towards the trapped or confined individual from the transmitter connected to the transmitting, rotating antenna at the first antenna position using the antenna polarities, and a next, different RF signal profile comprising the different modulation types;
receiving reflected signals from the trapped or confined individual at the rotating receiver connected to the receiving, rotating antenna corresponding to each next set of modulated RF signals;
repeating the transmission and reception steps for each next antenna position of the plurality of antenna positions;
combining all of the received reflected signals from the first and each next antenna position; and
completing an electronic analysis using all of the reflected signals from the first and each next antenna position, including a phase and frequency analysis, to detect movement of the trapped or confined individual based on changes in the phase and frequency differences of the reflected, received signals at each of the plurality of different antenna positions and polarities.