【摘要】 提出了一种基于粒子群优化的消除微弱信号采集过程中工频干扰的算法。通过人工构造观测信号,使系统模型符合盲源分离的数学模型要求。使用信号的四阶累积量作为信号独立性的判据,利用粒子群优化算法寻找使判据最大化的分离矩阵,进而消除被采集信号中的工频干扰。在粒子群优化算法的求解过程中,采用将对分离矩阵的直接辨识转换成对一系列Givens矩阵的辨识方法,从而减少了算法中对未知元素辨识的数量,避免反复白化过程,有效降低了算法的计算量,克服了粒子群优化过程中容易早熟收敛的问题。仿真结果表明,本算法在保护有用信号的前提下,能够有效地消除微弱信号中的工频干扰。更多还原

【Abstract】 This paper proposed a power interference removal algorithm in weak signal collection based on particle swarm optimization. It gave the system model consistent with BSS mathematical model by constructing observation signal artificially,and uesd fourth-order cumulant for estimating independence of the signal,found the separation matrix maximizing the criterion using particle swarm optimization and then the power interference could be removed. In the process of particle swarm optimization,transformed direct identification of the separation matrix into identification of a series of Givens matrices and reduced the number of unknown elements,avoided the whiting process and reduced computational complexity. Synchronously,overcame premature convergence problem in process of particle swarm optimization. The simulation results show that the algorithm is useful in eliminating power interference in weak signal and the useful signal can be protected efficiently.更多还原