Level Estimation with Radar Level Probe using Multipath Reduction Technique

In Industries there is presence of huge tanks working at extreme conditions of temperature and pressure. Accurate measurement of level is important in these applications. Radar based level probes are advantageous since they are non-contact. Many alternatives in level measurement work in contact with the liquid. These do not work in long term since reactions happen if the liquid is corrosive and the instrument get corroded. When using radar for level measurement, the tank being metallic enclosure lead to presence of multipath signals in the spectrum. This makes target detection difficult. Attenuation of the multipath signals become important while level measurement.In this paper, level measurement in tank filled with water using X band FMCW radar in multipath scenario is shown. Empty tank spectrum subtraction from the measured spectrum is done along with bin limiting to improve target detection. These results in the reduction of multipath signals from the measured spectrum and improve the SNR of the signals.