The invention relates to a
radio frequency cable fault positioning detection device and method. The device comprises an excitation source for generating a sweep frequency
signal, a power divider for enabling a
signal to be transmitted to a directional coupler and a
frequency mixer, the directional coupler which is used for receiving the
signal, enabling the signal to be transmitted to a measurement port, receiving a reflection signal transmitted by the measurement port, and transmitting the signal to the
frequency mixer, the measurement port which is used for enabling the received signal to be outputted to a measured
radio frequency cable, receiving the reflection signal, and transmitting the reflection signal to the directional coupler, the
frequency mixer which is used for enabling the sweep frequency signal and the reflection signal to be mixed to obtain a difference frequency signal, and transmitting the difference signal to a filter amplification module, the filter amplification module, an A / D conversion module, an FPGA processor, and a CPU which is used for carrying out
Fourier transform so as to obtain a difference frequency
signal frequency value and a power value. The method does not need correction, is high in testing efficiency, can achieve real-time monitoring, is large in measurement distance, and is low in installation and maintenance cost.