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Research on noise reduction of weak signals in grounding reliability testing of aircraft cable shield

机译：飞机电缆屏蔽层接地可靠性测试中微弱信号降噪的研究

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摘要

There are some signal sampling processes during the testing process of aircraft cable shield grounding reliability, and the current and voltage signals obtained are very weak. Also there exists some noise components which is independent of the signal to be analyzed due to the acquisition environment and the instruments used. If the signals are analyzed directly without filtering the noisy signal first, it will affect the final detection accuracy of the instrument. In this paper, a simulation model on the cable shield for aircraft loop impedance test system was established and analyzed deeply. The method of combined de-noising of EMD(Empirical Mode Decomposition) and wavelet transform was introduced. The comparing results between experimental data and simulation results show that the de-noising effect of this method is satisfying and reliable and can be utilized in application engineering field.
机译：飞行器电缆屏蔽层接地可靠性测试过程中有一些信号采样过程，获得的电流和电压信号非常弱。此外，由于采集环境和所使用的仪器，还存在一些噪声分量，这些噪声分量与要分析的信号无关。如果直接分析信号而不先过滤噪声信号，则将影响仪器的最终检测精度。本文建立了飞机回路阻抗测试系统电缆屏蔽层的仿真模型，并进行了深入分析。介绍了EMD（经验模态分解）和小波变换相结合的去噪方法。实验数据与仿真结果的比较结果表明，该方法的去噪效果令人满意，可靠，可以在应用工程领域中应用。

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