US 11,920,970 B2
Radar level gauging using corner reflector formed by product surface and tank wall
Christer Frövik, Linköping (SE); and Olov Edvardsson, Linköping (SE)
Assigned to ROSEMOUNT TANK RADAR AB, Mölnlycke (SE)
Filed by Rosemount Tank Radar AB, Mölnlycke (SE)
Filed on May 22, 2023, as Appl. No. 18/321,024.
Application 18/321,024 is a division of application No. 16/876,474, filed on May 18, 2020, granted, now 11,698,283.
Claims priority of application No. 19178327 (EP), filed on Jun. 5, 2019.
Prior Publication US 2023/0314202 A1, Oct. 5, 2023
Int. Cl. G01F 23/284 (2006.01); G01F 25/20 (2022.01); G01S 7/00 (2006.01); G01S 7/02 (2006.01); G01S 7/40 (2006.01); G01S 13/08 (2006.01); G01S 13/42 (2006.01); G01S 13/46 (2006.01); G01S 13/88 (2006.01); H01Q 1/22 (2006.01)
CPC G01F 23/284 (2013.01) [G01F 25/20 (2022.01); G01S 7/003 (2013.01); G01S 7/025 (2013.01); G01S 7/4008 (2013.01); G01S 7/4021 (2013.01); G01S 7/4026 (2013.01); G01S 7/403 (2021.05); G01S 13/08 (2013.01); G01S 13/426 (2013.01); G01S 13/46 (2013.01); G01S 13/88 (2013.01); H01Q 1/225 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of determining a filling level of a product in a tank using a radar level gauge system, the tank having a tank wall, and a tank atmosphere above a surface of a product in the tank, the method comprising:
generating and transmitting an electromagnetic first transmit signal;
propagating the first transmit signal through the tank atmosphere towards a corner reflector formed by the surface of the product and the tank wall where the surface of the product meets the tank wall, the corner reflector being at a known horizontal distance from the radar level gauge system;
receiving an electromagnetic first reflection signal resulting from reflection of the first transmit signal at the corner reflector;
determining a measure indicative of a propagation direction of the first reflection signal; and
determining the filling level based on the measure indicative of the propagation direction of the first reflection signal and the known horizontal distance between the radar level gauge system and the corner reflector.