US 11,988,541 B2
Method for radar measurement of a filling level in a container
Winfried Mayer, Buch (DE); and Manuel Sautermeister, Schopfheim (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/297,491
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Nov. 11, 2019, PCT No. PCT/EP2019/080797
§ 371(c)(1), (2) Date May 27, 2021,
PCT Pub. No. WO2020/108965, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10 2018 130 186.3 (DE), filed on Nov. 28, 2018.
Prior Publication US 2022/0034702 A1, Feb. 3, 2022
Int. Cl. G01F 23/284 (2006.01); G01S 7/35 (2006.01); G01S 13/34 (2006.01); G01S 13/88 (2006.01)
CPC G01F 23/2845 (2013.01) [G01S 7/354 (2013.01); G01S 13/34 (2013.01); G01S 13/88 (2013.01)] 11 Claims
OG exemplary drawing
 
9. A radar-based filling-level measurement device for determining a filling level of a filling material in a container, the device comprising:
a signal-generation unit configured to emit a microwave signal via an antenna in a direction of the filling material in each case in successive measuring cycles;
a receiving unit configured to receive via the antenna a corresponding receive signal generated after reflection of the microwave signal inside the container;
an evaluation unit configured to:
generate an evaluation curve with complex values in each measuring cycle based on at least the receive signal;
progressively store the respective current evaluation curve;
calculate a first difference curve with complex values by subtracting the evaluation curve of the current measuring cycle and the evaluation curve of a preceding measuring cycle; and
determine the filling level based on a maximum of the imaginary part or of the real part of the current, the first difference curve.