水下声信号未知频率的目标检测方法研究  

Research on Detection of Underwater Acoustic Signal with Unknown Frequency

作　　者：陈新华[1] 鲍习中[1] 李启虎[1] 孙长瑜[1] 

机构地区：[1]中国科学院声学研究所,北京100190

出　　处：《兵工学报》2012年第4期471-475,共5页Acta Armamentarii

摘　　要：提出了频率未知情况下基于阵列信号处理的一种目标检测方法。针对接收信号进行FFT分析,对处理频带的每一个频率单元进行波束形成,利用噪声对应频率单元波束输出的最大值随机。基于目标对应频率单元波束输出最大值基本一致的特点,统计各频率单元的方位(DOA)估计结果,从而实现对目标的检测。仿真结果表明,该方法的检测性能与频率已知时的检测性能一致,同时实验结果证明了该方法的有效性。为弱线谱目标检测提供了一个新的思路。A target detection method was presented based on the processing of array signal with unknown frequency. First, the received signals were processed using FFT. Then the beam-forming of every fre- quency unit was processed. The target was detected by calculating statistically the direction-of-arrival （DOA） results of every frequency unit, as DOA of noise frequency unit is random, and DOAs of target are nearly consistent. The simulation results shows that the detection performance of the method is con- sistent with the performance of processing the signal with known frequency. And the trial results prove that the algorithm is valid. A new idea is provided for the detection of weak line spectrum target.

关 键 词：信息处理技术 FFT分析 线谱检测 方位估计 

分 类 号：TB566[交通运输工程—水声工程]