摘要
本文对确定性窄带信号的理论相关函数和信号样本以及随机窄带信号样本用自回归(AR)和FFT两种方法进行了谱估计。这些结果很好地解释了声达信号的谱估计结果,即对靠得很近的双谱峰,AR的分辨率劣于FFT,对于相距较远的双谱峰和单谱峰,AR的估计精度好于FFT。在所有的情况下.AR方法的谱曲线平滑,旁瓣低。这两种方法联合使用是对声达信号进行谱估计的好方法。
In this paper, the power spectrum of theoretical correlation function and signal sample of the deterministic narrow band signal and the power spectrum of signal sample of the random narrow band signal are estimated by autoregressive (AR) and FET methods. Spectrum estimation of sodar signal is explained well by above results. When the distance between the two peaks in the power spectrum of sodar signal is small, the resolution of AR is inferior to FFT. When the distance between the two peaks in the power spectrum is large or th ere is single peak in power spectrum, the resolution and accuracy of AR is better than FFT. In all of these cases, the spectrum curve estimated by AR method is smooth and has low side lobe. Combinati on of both of the AR and FFT is a good approach to estimate the power spectrum of sodar signal.
出处
《声学学报》
EI
CSCD
北大核心
1989年第6期444-452,共9页
Acta Acustica
