基于自适应多重线性卡尔曼陷波的互调干扰抑制

Intermodulation Interference Suppression Based on Adaptive Multiple Linear Kalman Notch

针对环境中复杂多变的电磁辐射所引起的互调干扰问题,提出了一种基于自适应多重线性卡尔曼陷波(Adaptive Multiple Linear Kalman Notch Filter,AMLKNF)的互调干扰抑制方法.利用电磁环境效应试验建立的二阶互调低频阻塞干扰预测模型,在AMLKNF中设计一个自适应逻辑,根据干扰预测模型来调整陷波频率和深度,以抑制二阶互调低频阻塞干扰.最后通过仿真分析了该方法的性能,与传统陷波滤波方法相比,AMLKNF使信号损耗降低了30%以上,响应时间减少了1 ms,证明了该方法可以抑制至少40 dB的二阶互调低频阻塞干扰.

For electronic devices with communication function,the intermodulation interference caused by complex and changeable electromagnetic radiation in the environment has always been a difficult problem to overcome.An intermod-ulation interference suppression method based on adaptive multiple linear Kalman notch filter(AMLKNF)is proposed.An adaptive logic is designed using the second-order intermodulation low-frequency blocking interference prediction model es-tablished by the electromagnetic environment effect test in AMLKNF,and the notch frequency and depth are adjusted ac-cording to the interference prediction model to suppress the second-order intermodulation low-frequency blocking interfer-ence.Finally,the performance of this method is simulated and analyzed.Compared with the traditional notch filtering meth-od,AMLKNF reduces the signal loss by more than 30%and the response time by 1 ms,which proves that this method can suppress the second-order intermodulation low-frequency blocking interference by at least 40 dB.