Dispersive correction demands for fmcw - radar in a pipe

摘要

It is a measurement device for determining a distance to a surface of a medium or to a different radar target in a pipe. The measurement device operates in accordance with the fmcw - principle and comprises a radar end unit, which is configured for the purpose, a radar end signal is to be generated, which in accordance with the fmcw - principle is frequency-modulated, and a radar reception unit a, which is configured for the purpose, a on the surface of the medium or on the other radar target back in the tube to receive the reflected radar reception signal, the radar reception signal by mixing with the radar end signal or a signal derived therefrom to convert into an intermediate frequency signal and, on the basis of the resulting intermediate frequency signal a distance to the surface of the medium or to the other radar target in the tube to determine. The radar reception unit is designed for the purpose of a, a phase correction on the phase curve of the intermediate frequency signal and to be used to produce a phases corrected intermediate frequency signal, wherein the phase correction is designed for this purpose, a dispersion dependent phase portion in the phase characteristic of the intermediate frequency signal, to reduce or eliminate it, and a not of dispersion effects dependent phase portion to add. The radar reception unit is designed for the purpose of a, on the basis of said phase corrected intermediate frequency signal which is the target frequency components in the intermediate frequency signal to determine and on the basis of the target frequency components of the distance to the surface of the medium or to the other radar target in the tube to determine.