Equaliser for the intermediate frequency channel of an FMCW fill level sensor

A frequency-modulated continuous-wave (FMCW) fill level sensor comprising:

• an FMCW module configured to convert a measurement signal from the FMCW fill level sensor into an intermediate frequency signal;
• and
• an intermediate frequency channel configured to generate an echo curve from the intermediate frequency signal,
• wherein the intermediate frequency channel comprises:
• an analogue-digital converter configured to digitalise the intermediate frequency signal, and
• an equaliser configured to equalise the intermediate frequency signal digitalised by the analogue-digital converter, and
• wherein the equaliser is configured to
• (a) convolute the digitalised intermediate frequency signal by an equalising function in the form of a time function g(nT), or
• (b) multiply the digitalised intermediate frequency signal by an equalising function in the form of a transfer function G(ωk) at discrete frequencies, or
• (c) perform as a filter having a finite or infinite impulse response (FIR/IIR filter) configured to filter the digitalised intermediate frequency signal, or
• (d) multiply the digitalised intermediate frequency signal by an equalising function in the form of the magnitude of the transfer function G(ωk) at discrete frequencies,
• wherein the intermediate frequency channel further comprises a window module, which is disposed downstream of the equalizer, and is configured to window the intermediate frequency signal obtained by convolution, multiplication or filtration by the FIR/IIR filter.