FREQUENCY MODULATED RADAR LEVEL GAUGING Russian patent published in 2019 - IPC G01F23/284 G01S13/08 G01S13/34 

FIELD: measuring equipment.

SUBSTANCE: present invention relates to a radar level gauge and a method for measuring the distance to the surface of a product in a tank. Said radar level gauge contains a transceiver circuitry configured to transmit and receive electromagnetic signals, wherein this transceiver circuitry contains a frequency stabilizing feedback loop, configured to generate the electromagnetic transmit signal in the form of a frequency sweep. Said frequency stabilizing feedback loop is configured to generate oscillations that form a sinusoidal modulation of the frequency sweep. Further, the radar level gauge comprises a second mixer, configured to mix an intermediate frequency signal and an integer multiple of the frequency of the sinusoidal modulation to provide an adjusted intermediate frequency signal, and a processing circuitry configured to determine said distance based on said adjusted intermediate frequency signal.

EFFECT: increased sensitivity of the proposed method for determining the distance to the surface of the product in the tank, and the radar level gauge due to receiving a frequency sweep containing sinusoidal modulation.

14 cl, 6 dwg