RADAR LEVEL GAUGING WITH SIGNAL DIVISION Russian patent published in 2018 - IPC G01S7/35 G01F23/284 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a radar level gauge. Method is proposed for providing narrow-band interference unaffected measurement of a distance to a surface of a product kept in a tank. Method comprises mixing (S3) a return signal with a transmit signal to provide an intermediate frequency signal, and determining the distance, based on the intermediate frequency signal. Step of determining the distance further comprises dividing (S4) the intermediate frequency signal into frequency portions, wherein each frequency portion corresponds to the determined frequency interval of the transmit signal, identifying (S5) disturbed frequency portions as frequency portions affected by narrow-band interference, and determining (S6) the distance based on frequency portions being unaffected by narrow-band interference. By dividing the intermediate frequency signal into frequency portions corresponding to frequency intervals of the transmit signal, frequency intervals where narrow-band interferences are present may be detected.

EFFECT: technical result is improved functioning of a radar level gauge under narrowband interference.

14 cl, 4 dwg