一种低信噪比测频技术

Measurements of signal frequencies under low signal to noise ratio conditions

鉴于数字信号处理器(DSP)的迅速发展,本文提出了一种计算式测频方法。该方法可根据采样幅值计算出待测频率,并与自适应滤液器和参数平滑技术相结合,从而可在信噪比较低和存在其他线谱干扰的情况下实现信号频率的精测。计算机仿真和实际的工程使用已证明了它的有效性。该方法在水声和其他通信系统中具有一定的应用价值。

In this paper we propo.se a new method of frequency mesurements. Since frequency computing is directly in connection with adaptive filtering and smoothing, it has quite high accuracy of frequency mesurements when strong noises and linear spectrum interferences exist,It also can easily be realized with digital signal process rs. Therefore it has wide applications to underwater communications and other systems.