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.

In view of the fact that aircraft has frequent line faults, which seriously threatens flight safety and lacks effective means of line fault detection, based on the analysis of traditional cable fault detection and location methods, a more suitable method for fault detection and location of aircraft cables is explored. On the basis of theoretical research, further develops of the software and hardware design of cable fault detection and location system is presented based on improved spread spectrum time domain reflectometry. The testing method and flow chart are put forward and applied to actual aircraft cable testing. The influence of different test conditions on test precision is verified by test experiments of different types of cables. It provides a theoretical reference for aircraft cable fault detection and location, and provides a design idea for further solving the actual aircraft line test requirements.

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