摘要
利用Burg法分析了被白噪声污染的功率谱,并将结果与传统周期图法进行了比较。当阶数比较小时,Burg谱比较平坦,信号被噪声掩盖;随着阶数的增加,分辨率增加;当阶数进一步增加时,虚假峰出现,并逐渐增多,以至于信号被噪声淹没。这一结果表明,系统一定存在某个阶数,在这个阶数附近Burg谱质量最好。指出了这个阶数就是最佳正则参数;而且还指出了,只需进一步考虑残差向量的归一化累积误差,并同K-S判据相结合就可以确定它。
The power spectrum of the signal polluted with the white noise is analysed by Burg method,and its result is compared with the periodogram method.When the ratio of the order-number is little,Burg spectrum is over-smooth and the signal is covered by the noise;with the increase of the order-number,the resolution increases too. When the order-number further increases,the false peak occurs and gradually increases,so that the signal is submerged by the noise.The results show that there must be an order-number and the best quality in burg spectrum near this order number;meanwhile,it is indicated that this order-number is just the optimum regularization parameter,just to further consider NCP of the residual and K-S limit,the optimum regularization parameter may be detemined.
出处
《东莞理工学院学报》
2010年第3期51-54,共4页
Journal of Dongguan University of Technology
关键词
正则参数
谱估计
Burg法
功率谱
阶数
regulanization parameter
spectrum estimation
Burg method
power spectrum
order-number
