Time-domain reflectometric cable length measurement technology mainly depends on calculating the energy re-flected by the impulse sent into the cable when it meets the impedance mismatch point to measure the cable.With respect to cable length measurement,time-domain reflectometry technology is simple in principle,non-hazardous to the cable,and is not limited by the number and length of cable cores.Wave velocity is an important parameter in the process of measuring cable length using time-domain reflectometry technology.Therefore,this paper mainly studies the wave speed characteristics.
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