摘要
随着海洋开发的不断发展,对水中目标的识别提出了越来越高的要求,而目标识别的关键又是水中目标基频的提取。所以本文提出差频与倍频算法的综合运用的方案来实现在低信噪比的条件下也能较好地估计水中目标基频。本文中对整个提取过程中的噪声处理、包络的解调、包络谱的净化、连续谱的平滑、疑似线谱的提取、基频的提取共六个过程的所用方法分别进行了择优。详细地阐述了差频算法与倍频算法在估计基频时的方法并作了仿真。试验结果表明该方法具有良好的效果,在水中目标基频提取中会得到很好的应用。
With the continuous development of marine development, the identification of underwater targets is put forward ever-increasing demands,and the key of the identification is the estimation of fundamental frequency. The innovation of this paper is that The estimation for the underwater target＇s baseband is based on both the difference frequency and octave algorithm.In this paper,the methods for the inhibition of noise, the demodulation of envelope,the purification of envelope＇s spectrum,the smooth of continuous Spectrum,the extraction of suspected line spectrum, the extraction of baseband are choosed better. The difference frequency algorithm and octave algorithm are expounded in detail and simulated. The trial has shown that the method is good .
出处
《微计算机信息》
2009年第18期267-269,共3页
Control & Automation
基金
基金申请人:杨日杰
项目名称:多基地航空探潜优化搜索布阵和定位技术研究
基金颁发部门:国家自然基金委信息部(60572161)
关键词
差频算法
倍频算法
基频估计
水中目标
Difference Frequency Algorithm
Octave Algorithm
The Estimation for Baseband
The Underwater Target
