Abstract: The invention sets forth a method of determining a filling level of a product contained in a tank using a radar level gauge system. The steps include generating a transmission signal using first pulse generating circuitry outputting a first signal having a first oscillation frequency having a first pulse repetition frequency. The invention uses a second pulse generating circuitry having a resonator element having an input and an output, a reference signal in the form of a second pulse train having a second pulse repetition frequency which differs from the first pulse repetition frequency by a predetermined frequency difference. The invention forms a measurement signal including a sequence of values representing a time correlation between a pulse of the reference signal and the reflected signal, and determines the filling level based on the measurement signal.

Abstract: A method of determining a filling level of a product contained in a tank using a radar level gauge system, the method comprising the steps of: generating a transmission signal using first pulse generating circuitry outputting a first signal having a first oscillation frequency, the transmission signal being in the form of a first pulse train having a first pulse repetition frequency; generating, using second pulse generating circuitry comprising a resonator element having an input and an output, a reference signal in the form of a second pulse train having a second pulse repetition frequency, the second pulse repetition frequency differing from the first pulse repetition frequency by a predetermined frequency difference; propagating the transmission signal towards a surface of the product contained in the tank; receiving a reflected signal resulting from reflection of the transmission signal at the surface of the product; forming a measurement signal comprising a sequence of values, each value representing a