文章摘要
刘科满,相敬林.起伏背景下目标噪声线谱检测与频率估计[J].声学技术,2008,(5):746~749
起伏背景下目标噪声线谱检测与频率估计
Detection and frequency estimation for the targets radiated lines on fluctuating background
投稿时间:2007-10-18  修订日期:2008-02-10
DOI:
中文关键词: 频率估计  Newton-Raphson法  FFT  海洋环境噪声
英文关键词: frequency estimation  Newton-Raphson's method  FFT  ambient noise
基金项目:国防预研基金项目(51405020304HK0354)
作者单位E-mail
刘科满 西北工业大学航海学院, 西安, 710072 liunpu@yahoo.cn 
相敬林 西北工业大学航海学院, 西安, 710072  
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中文摘要:
      针对传统的水下目标辐射噪声线谱检测与频率估计方法所存在的不足,提出一种起伏背景下的水下目标辐射噪声线谱检测与线谱频率估计的方法。通过对观测数据的预处理,滤除目标辐射噪声起伏趋势项,再分别使用FFT方法和修正的Newton-Raphson迭代法来实现对目标辐射噪声线谱频率的粗略估计和精确估计。仿真结果表明,该方法计算量较少,提高了检测概率和频率估计精度,且频率估计值的均方根误差较传统的周期图方法更接近Cramer-Rao界。
英文摘要:
      An algorithm of detecting target radiated noise lines and estimating frequencies of the lines is presented.The algorithm is composed of a coarse search and a fine search after removing a trend in a times series of radiated noise with Wagstaff's method.The coarse search of the frequency is made by FFT and the fine search of the frequency is estimated by an interpolation scheme and a modified Newton-Raphson's method.Experimental results on sea trial data and simulation data show that the detection performance of the proposed method is superior to that of FFT method by 3~8dB.Also it is demonstrated that the proposed method results in a frequency estimation performance nearer to the Cramer-Rao Bound than FFT method dose.
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