Radar level gauges are widely used in environmental protection, power, petroleum, chemical, steel and other industries. This is inseparable from the fact that radar waves can reliably measure liquid levels without being affected by changes in the density, dielectric constant, conductivity of the measured medium, as well as foam, smoke, steam and other media. Although radar level gauges have many advantages, due to the complexity of the measured policies and working conditions, defects are inevitable in the application process of radar level gauges, which affects accurate measurement.