A radar fill level measurement sensor for measuring the level of material
in a container, includes a transmit/receive circuit that transmits an
electromagnetic pulse, and detects reflected electromagnetic pulses and
provides an intermediate frequency signal indicative of the reflected
electromagnetic pulses. A logarithm detector circuit receives the
intermediate frequency signal and provides a logarithmic output signal
indicative of the logarithm of the intermediate frequency signal. An
evaluation unit receives and processes the logarithmic output signal, to
determine the fill level of the material within the container, and
provides a fill level measurement signal indicative thereof.
