Radio frequency cable fault positioning detection device and method

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of cable fault detection, in particular to a radio frequency cable fault location detection device and a detection method thereof. Background technique [0002] Radio frequency cables are indispensable components in radio communication systems and electronic equipment, and have been widely used in wireless communication and broadcasting, television, radar, navigation, computers and instruments, so the detection and maintenance of radio frequency cables is very important. In order to accurately and timely detect cable faults and reduce losses caused by communication cable faults, more and more communication systems require real-time fault monitoring of radio frequency cables. [0003] The existing most widely used cable fault location and detection instrument is based on the principle of frequency domain reflection and the design of a single-port vector network analyzer. It consists of an excitation signal so...

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Problems solved by technology

[0004] However, this method requires calibration and error correction operations when measuring RF cables, and the measurement efficiency is low. When the ambient temperature changes greatly, the calibration data will become invalid, and the calibration operation must be performed again, and the RF cables cannot be monitored in real time; and the measurement distance Due to the limitation of the directivity index of the measuring instrument, it is impossible to realize the fault location detection of the long-distance cable

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