飞机电缆屏蔽层环路阻抗信号降噪方法研究  

Research on Noise Reduction of Weak Signals in loop Impedance Measurement of Aircraft Cable Shield

作　　者：王茜[1] 牟春宇[1] 王家林[1] 石旭东[1] 

机构地区：[1]中国民航大学,天津300300

出　　处：《计算机仿真》2015年第6期96-99,共4页Computer Simulation

基　　金：国家商用飞机制造工程技术研究中心创新基金(SAMC13-75-15-016)

摘　　要：在飞机电缆屏蔽层接地可靠性检测过程中,需要使用磁耦合器获取电缆屏蔽层环路的电压和电流信号,采集得到的电压电流信号非常微弱,由于信号采集环境和采集仪器的原因,不可避免的存在一些与分析信号无关的噪声成分,如果对于噪声不加以处理而直接分析,会直接影响到仪器最后的检测精度。首先针对飞机电缆屏蔽层环路阻抗测试系统利用Simulink对其建立了仿真模型,得到了仿真后的电压电流信号,利用各自的降噪方法研究了经验模态分解小波阀值降噪方法,最后通过仿真表明,采用经验模态分解的小波阀值降噪方法在处理低信噪比的信号时有较好的效果。During the reliability test of the aircraft cable shielding layer, the loop voltage and loop current are the key parameters which need to be accurately measured by the magnetic couplers. Because the measured signals are quite weak, and there exist additional noise signals which are generated by the test environment and the instruments, the test is often inaccurate. In order to improve the test accuracy, a Simulink model of this loop impedance testing system is built to simulate the loop voltage and loop current signals, and then different noise reduction methods are implemented. Simulation result shows that the threshold de - noising method which based on wavelet EMD gives a good solution.

关 键 词：飞机屏蔽层环路阻抗 小波变换 经验模态分解 仿真 

分 类 号：V242.4[航空宇航科学与技术—飞行器设计]