摘要
常规被动声纳利用宽带波束能量进行目标检测,在低信噪比、强目标干扰情况下,宽带能量检测的性能迅速降低。利用鱼雷辐射噪声信号中含有丰富线谱成分的特点,提出了一种针对鱼雷辐射噪声信号的窄带和宽带联合检测方法。通过对预成波束方向信号的窄带处理和线谱提取,利用特定频段的线谱能量对宽带波束输出进行加权,提高了线谱目标的检测能力。该方法能够有效地抑制非线谱强干扰目标,提高低信噪比信号的检测能力。仿真和海试数据处理结果验证了该方法的有效性。
Broadband energy detection has been widely used to passive sonar. But its performance degrades dramatically under condition of the low SNR and strong interference. Since there are abundant line spectra in torpedo radiated noise, a combined detection algorithm of the torpedo radiated noise is put forward. After each beam output is processed by the narrowband processing and line spectrum extraction, the energy of line spectrum with specified frequency band is used as the weighted factor of broadband beam output in order to improve the detection ability of the targets containing line spectrum. This algorithm can effectively suppress the strong interference of targets without line spectrum and improve the detection ability of the low SNR targets. The processing results from simulation and sea trial data show the validity of the proposed algorithm.
出处
《声学技术》
CSCD
2010年第1期18-22,共5页
Technical Acoustics
关键词
被动声纳
宽带检测
窄带检测
鱼雷辐射噪声
passive sonar
broadband detection
narrowband detection
torpedo radiated noise
