Aircraft Cable Fault Detection and Location Based on SSTDR

Cheng-cheng WANG, Chu-wan XIAO, Xin WANG, Jing SUN


In the detection and positioning of aircraft cable faults based on Time Domain Reflectometry (TDR), due to the multiple cable connectors of the aircraft and in a severely noisy environment, the reflected signals are severely attenuated and waveform distortion exists, making it impossible to achieve accurate cable fault detection. In order to solve these problems, this paper designs the spread spectrum time domain reflectometry (SSTDR) for the characteristics of the aircraft cable, selects the m-code as the original signal, outputs the BPSK modulation with a modulation ratio of 0.5, and finally uses the correlation algorithm to obtain the fault type and distance. Using a signal source, an aircraft cable and an oscilloscope, an actual measurement system is used to test aircraft cables of different lengths. The test results show that SSTDR has high noise immunity and detection accuracy in actual tests.


TDR, SSTDR, Aircraft cable, Fault location


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