Fill level measuring device

A radar-based fill-level measuring device, comprising:

• a pulse generating unit designed to generate high-frequency electrical pulses having a defined clock rate;
• a transmitting/receiving unit designed:
• to emit the high-frequency pulses as microwave pulses in a direction of a filling material, and
• to receive reflected microwave pulses after reflection at a surface of the filling material;
• a sampling unit designed to generate electrical sampling pulses at a defined sampling rate;
• a mixer designed to mix the received microwave pulses with the sampling pulses such that an evaluation signal is generated;
• a detector designed to measure a relation between the sampling rate of the sampling pulses and the clock rate of the high-frequency pulses;
• and
• an evaluation unit designed:
• to generate an evaluation curve by using the evaluation signal, the measured relation, and a predefined target relation, and
• to determine the fill level on the basis of the evaluation curve,
• wherein the evaluation curve is generated by a temporal expansion or compression of the evaluation signal, wherein the compression or the expansion is carried out as a function of a ratio between the measured relation and the target relation.