US 12,298,421 B1
Geo-locating of wireless devices using sum of round trip time and angle of arrival squared residuals
Mark Passler, Rockville, MD (US); and Kyle Patrick Kelly, Palm Beach Gardens, FL (US)
Assigned to SR Technologies, Inc., Sunrise, FL (US)
Filed by SR Technologies, Inc., Sunrise, FL (US)
Filed on Nov. 4, 2024, as Appl. No. 18/936,682.
Claims priority of provisional application 63/597,421, filed on Nov. 9, 2023.
Int. Cl. G01S 5/02 (2010.01); G01S 5/12 (2006.01)
CPC G01S 5/0284 (2013.01) [G01S 5/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for determining a geo-location of a target station, the method comprising:
transmitting, from a measuring station, a plurality of ranging packets to a target station;
receiving, at the measuring station, a plurality of response packets transmitted by the target station in response to the plurality of ranging packets;
determining a plurality of round-trip times (RTTs) based on the plurality of ranging packets and the plurality of response packets, each RTT of the plurality of RTTs being a time elapsed between a transmission of a ranging packet and a reception of a corresponding response packet;
determining a plurality of angles of arrival (AOAs) based on the plurality of response packets, each AOA of the plurality of AOAs corresponding to an angle that a response packet was received at the measuring station;
calculating a first plurality of squared residuals for the plurality of RTTs;
calculating a second plurality of squared residuals for the plurality of AOAs;
generating a third plurality of squared residuals by summing the first and second pluralities;
calculating a minimum of a sum of the third plurality to identify best-fit location parameters for the target station;
generating a circular error probability (CEP) ellipse using the best-fit location parameters for the target station; and
determining a geo-location of the target station based on the CEP ellipse.