雷电产生的海洋电磁场研究中Levinson-Durbin算法实现

摘要

雷电是海洋天然电磁场的主要场源之一,它会对水中兵器产生较大影响.由于雷电持续时间较短,利用传统的谱估计方法难以提取出信号的线谱频率.利用基于输出序列自相关阵的Levinson-Durbin递推算法,求解AR模型参数,进而计算出信号的功率谱.计算结果表明,Levinson-Durbin算法可以准确地估计出信号的线谱特征.%Lightning is one of the main natural sources of electromagnetic field in sea, and it will give serious influence to subaqueous weaponry. Because the duration of lightning is short, using classical spectrum estimation is hard to extract line characteristic of spectrum frequency. The Levinson-Durbin recursion algorithm based on autocorrelation matrix of output sequence was used to calculate parameter of AR model; power spectrum of the signal was calculated from the model. The result showed that LD algorithm can obtain correct line characteristic.