Patent ID: 7639177
Filing Date: 2009-12-29
Classification: G01F,G01S

Abstract:
1. A fill-level measuring device that operates according to a frequency modulated continuous wave (FMCW) principle, comprising: a storage unit storing a first reference correlation, the first reference correlation being determined during a first reference phase of the fill-level measuring device, between a frequency radiated from the fill-level measuring device and a radiation time; an evaluation unit determining a correlation, the correlation being determined during an operating phase of the fill-level measuring device, between amplitude values of an intermediate-frequency signal and the radiation time; and a correction unit; wherein the correction unit performs one of (a) correcting the amplitude values, wherein the intermediate frequency signal is scanned at equidistant points in time and wherein the amplitude values of the intermediate-frequency signal of the real sensor determined during the operating phase of the fill-level measuring device are mathematically corrected so that a resulting digital signal equals a signal from an ideal FMCW system and (b) calculating points in time for sampling the amplitude values based on the first reference correlation, wherein the intermediate-frequency signal is scanned at calculated, adapted points in time so that a resulting digital signal equals a signal resulting from an ideal FMCW system.