Method for detecting aircraft cable fault by use of Wigner data distribution matrix

Abstract

The invention relates to a method for detecting aircraft cable fault by use of Wigner data distribution matrix. The method comprises the following steps: an incoming reference signal setting step, including a center frequency selection stage, a frequency bandwidth selection stage and a stage for selecting time width of the incoming reference signal according to the selected center frequency and the frequency bandwidth; a signal transmission step, including transmitting the set incoming reference signal to a to-be-tested cable with a receiving interface; a noise reducing step, including receiving a reflection signal of the to-be-tested cable with the receiving interface, and reducing noise of the received reflection signal of the to-be-tested cable by using a wavelet coefficient shrinkage noise reduction method, to reduce the influence of noise signals on the reflection signal; and a fault information processing step, including calculating the correlation between the incoming reference signal and the reflection signal, and calculating local peak time in the correlation function waveform to accurately determine the fault position of the aircraft cable. According to the invention, this kind of fault information is more obvious by using Wigner data distribution matrix, thereby improving fault detection efficiency of aircraft cables.

Description

technical field [0001] The invention relates to an aircraft cable fault detection method. In particular, it relates to a method for detecting aircraft cable faults using a Wegener data distribution matrix. Background technique [0002] With the rapid development of our country's national economy, the civil aviation transportation industry has entered a period of rapid development, and more and more attention has been paid to flight safety issues. Aircraft fires caused by short-circuits of aircraft cables and signal transmission errors caused by aircraft cable faults have occurred from time to time, and have caused many flight accidents. The problem of aircraft cable fault diagnosis and location has become one of the urgent problems to be solved in the international civil aviation industry. It is necessary for each aviation maintenance department to conduct regular inspections on aircraft cables by using advanced diagnostic and positioning methods and instruments in accordan...

AI Technical Summary

Problems solved by technology

However, when the aircraft cable is partially disconnected, the cables in the wiring harness are intermittently connected, or the shielding metal mesh of the aircraft cable penetrates the insulating layer and the aircraft cable is intermittently connected, the impact on its characteristic impedance is small. The above two reflections The signal changes reflected by the measurement method are very weak, and these intermittent faults are difficult to diagnose

When continuous faults occur in the aircraft cable, the above two reflection measurement methods will produce multiple reflections. Except for the first fault point, which is easy to judge, other fault points are difficult to judge

In a general measurement environment, the above two reflection measurement methods need to amplify the weak reflection signal, resulting in the corresponding amplification of the noise signal, which affects the judgment of the fault reflection signal and increases the false alarm rate of aircraft cable faults

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