【摘要】 研究一种抗电磁干扰的方法,能够降低噪音干扰的信号强度,减小误差,增强抗电磁互干扰效果,在实际应用中具有一定的实用性。针对当前方法抵抗噪音信号干扰时,由于电磁信号受到噪音信号的影响导致仪器传输信号衰弱、电机无规则转动、数字显示表乱跳等现象发生,提出一种基于三角自卷积窗的抗电磁干扰方法。上述方法通过利用小波变换原理计算干扰信号尺度系数和平移系数,运用小波滤波器分解电磁干扰信号多分辨率,检测出多智能仪器电磁互干扰信号;利用三角自卷算法截短加长离散信号,经过傅里叶转换得到离散频谱幅度,依据离散频谱幅度值计算抗电磁信号干扰频率、幅值和初相角,获得多仪器间抗电磁互干扰信号。仿真结果表明,所提方法可以增强信号强度、提高信噪比、降低均方误差、提高抗电磁仪器间抗电磁互干扰效果。更多还原

【Abstract】 To study an anti-electromagnetic interference method can reduce the signal intensity of noise interference and enhance the anti-electromagnetic mutual interference effect. This paper presents an anti-electromagnetic interference method based on triangular self-convolution window. At first, the above method used the principle of wavelet transform to calculate the scaling coefficient and the translation coefficient of interference signal, and then used the wavelet filter to decompose the multi-resolution of electromagnetic interference signal and detect the electromagnetic mutual interference signal of multi-intelligent instrument. Moreover, we used the triangular self-convolution algorithm to shorten and lengthen the discrete signal. Through Fourier transform, we obtained the discrete spectrum amplitude. On this basis, we calculated the frequency of anti-electromagnetic signal interference, the amplitude value and the initial phase angle. Finally, we obtained the anti-electromagnetic mutual interference signal between multiple instruments. Simulation result show that the proposed method can enhance the signal intensity and improve the signal to noise ratio. Meanwhile, this method can reduce the mean square error and improve the anti-electromagnetic mutual interference effect between anti-electromagnetic instruments.更多还原