Application of Six-Port for Distance Measurement

The method for determining the distance based on the six-port junction was developed. The distance is calculated through phase of standing wave, standing wave appears due to superposition of incident and reflected from target wave. The problem of such measurement is repeatability of phase reading every period. The known dual-tones method of measured distance range increasing consists in using beats of two closely spaced frequencies when a difference signal is calculated, and the measured distance range of the difference signal is almost ten times more than measured distance range of the original signals. The proposed method of measurement distance range increasing consists in increasing number of closely spaced frequencies of incident to target signal, than two difference signals are obtained, and then the difference of the difference signals is determined which leads to distance range increasing. Technically, it is better to implement such a method of measuring distance using coaxial tract six-port junction rather than waveguides as coaxial frequency range is very wide.