Cable fault detecting and positioning method based on waveform replication

Abstract

The invention discloses a cable fault detecting and positioning method based on waveform replication. The cable fault detecting and positioning method comprises the following steps of: arranging a cable fault detecting and positioning system with an FPGA (Field Programmable Gate Array) chip as a processor; outputting reference voltage to a high-speed comparator by running an embedded NIOS soft core inside the cable fault detecting and positioning system as a control core; transmitting set pulse to a detected cable by a pulse transmitting driving circuit; acquiring the comparison result of the high-speed comparator and storing the comparison result to an SDRAM (Synchronous Dynamic Random Access Memory) by a shift register module; then changing a value of reference voltage from high to low and repeating the processes of transmitting the pulse and acquiring and storing the comparison result; and finally, reading back the stored data by the NIOS soft core, carrying out waveform replication on the data; displaying the data through an LCD (Liquid Crystal Display); analyzing the replicated waveform; and judging the types of faults and calculating the position of fault points according to the conditions of echo.

Description

technical field [0001] The invention relates to the detection and positioning of network cable faults, in particular to a network cable fault detection and positioning method based on waveform reappearance, which belongs to the technical field of testing. Background technique [0002] With the rapid development of network information technology, the Internet has entered thousands of households and has become one of the indispensable elements in people's life, which has had a profound impact on human production and life. With the rapid development of the Internet, network failures caused by network transmission cable failures occur from time to time, seriously affecting people's normal work and life, and causing huge economic losses. However, most of the traditional network cable fault detection methods have disadvantages such as complex use, low test accuracy, long test cycle, high maintenance and repair costs, and the special wiring method of network cables also brings diff...

AI Technical Summary

Problems solved by technology

Because the transmission speed of the pulse signal in the cable is very high, about 200m / μs (the value will be different according to the cable insulation medium), this requires a high speed of signal acquisition and processing for the test system. If the traditional The oscillographic method of using high-speed A / D for data acquisition is not very ideal, and the price of high-speed A / D chips is also very expensive, which is not conducive to productization

Images