基于SSTDR的飞机电缆故障检测与定位

Aircraft cable fault detection and location based on SSTDR

在基于时域反射法(TDR)的飞机电缆故障检测与定位中,由于飞机电缆多转接头且处于噪声干扰严重的环境,其反射信号衰减严重且存在波形畸变,无法实现准确的电缆故障检测与定位。为了解决这些问题,针对飞机电缆特点设计扩展频谱时域反射法(SSTDR),选择m码作为原始信号,经调制比例为0.5的BPSK调制后输出,最后利用相关算法得到故障类型和故障距离。通过利用传统TDR与本文设计的SSTDR对飞机电缆进行实测,测试结果表明TDR测试误差率为1.4%,而SSTDR的测试误差率为0.7%,大大提高了检测精度,同时测试结果表明SSTDR比TDR具有更强的抗干扰能力,所设计的SSTDR更适合飞机电缆故障检测与定位。

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.By using the traditional TDR and the SSTDR designed in this paper to test the aircraft cable, the test results show that the TDR test error rate is 1.4%, and the SSTDR test error rate is 0.7%, which greatly improves the detection accuracy.At the same time, the test results show that SSTDR has stronger anti-interference ability than TDR, so the SSTDR designed in this paper is more suitable for aircraft cable fault detection and location.