Summary of Continuous Wave Radar Level Transmitter

FM - CW (frequency modulated continuous wave) radar

  • Indirect method of level measurement

  • Requires Fast Fourier Transform (FFT) analysis to convert signals into a frequency spectrum

  • FFT analysis requires processing power and therefore practical FM - CW process radars have to be four wire and not two wire loop powered

  • FM - CW radars are challenged by large numbers of multiple echoes (caused by the parabolic effects of horizontal cylindrical or dished topped vessels)