A Fault Diagnosis Method Using Spread Spectrum Carrier

Abstract

The invention discloses a method of achieving fault diagnosis through the expansion carrier wave diagnosis. The steps are as follows: Design incident signal parameters, select the expansion sequence for fault detection, determine the central frequency and sequence length of the expansion code, to the power carrier letter source signalSegmentation and reconstruction; use the fault detection spreading sequence as the carrier spread code, the transformation of the transformed power carrier letter source signal is expanded to generate the SSPLCR sequence; coupling the SSPLCR sequence intoWhen there is no failure, the SSPLCR signal is transmitted to the receiving end via the cable; when the cable is faulty, the SSPLCR signal is reflected and returned to the sending end.Extract the SSPLCR failure reflex signal at the sending end, and obtain the cable failure type and location through the relevant operations.This method realizes the integration of electric energy transportation, data transmission, and fault diagnosis, which enhances the reliability and maintenance of electrical energy conveying and communication systems.

Description

technical field [0001] The invention relates to a method for realizing the combination of power carrier and fault detection and location based on spread spectrum communication, which belongs to the technical field of carrier communication. Background technique [0002] In the aerospace system, in order to ensure the high reliability of the system, it is necessary to collect the status parameters of multiple parts of the system for the detection and diagnosis of electrical, airborne measurement and control, flight status, atmospheric data and avionics system status. In order to realize the detection and control requirements of the system, it is necessary to collect data from a large number of sensors and control a large number of actuators, and the number of data transmission lines also increases accordingly. At the same time, the intelligentization of aerospace systems, the increasing reliance on engine control and vehicle management systems, the enrichment of in-flight ente...

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Problems solved by technology

[0010] (2) The SSTDR fault detection system injects detection signals into the power line through the PLC tap point. The carrier communication signal and the fault detection signal coexist in the channel. The two carrier signals have partial spectrum overlap, which reduces their respective signal-to-noise ratios and interferes with each other. The recovery of the carrier signal is difficult, and the synchronization of the carrier communication function and the fault detection function is affected

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