一种改进的自适应干扰对消技术研究及在电磁辐射测量中的应用

摘要

提出了一种适合于处理非平稳随机信号的改进自适应干扰对消算法.首先利用经验模态分解的分频特性将多频复杂信号分解到不同的固有模态函数中,再利用改进的最小均方自适应算法进行干扰对消.计算机仿真以及试验结果证明,该方法有效地滤除了含噪电磁信号中的电磁噪声干扰,提高了电磁辐射测鼍的速度和精度,具有重要的工程应用价值.%The paper presents an improved adaptive interference cancellation algorithm filtering nonstationary random signal.The complex electromagnetic radiation signal is decomposed to some signals with different frequency by the Empirical Mode Decomposition( EMD ) method. An improved least mean square(LMS) algorithm is applied to the adaptive interference cancellation.Computer simulation and experimental results show that the method has better noise cancellation capability than the traditional adaptire noise cancellation. At the same time, the adaptive interference cancellation improves the speed and precision of electromagnetic radiation measurement. So it can be introduced to the engineering application.