摘要
为了探测携带呼吸器的水下蛙人目标,实验研究了蛙人呼吸辐射声信号的基本原理,提出了基于蛙人呼吸周期性特征的水下蛙人被动检测方法。水池实验获得了蛙人呼吸的周期性声信号,论证了被动探测的可行性。由于蛙人呼吸声信号所具有的显著频带,所以分别利用了带通滤波法和匹配滤波法获取周期信号的包络,并提取包络信号频谱的四类特征用于判决。三亚湖试结果表明:四类特征对蛙人的探测距离存在差异,最远能在40 m附近检测到蛙人,并且匹配滤波法的检测性能明显优于带通滤波法。结论:受限于辐射源的能量级,被动方法对蛙人的探测距离有限。
To detect underwater divers who are equipped with breathing apparatus,experimented and studied the rational of emitting acoustic signal by diver＇s breath,and proposed a passive detection method based on periodicity of diver＇s breath.Tank experiment got diver＇s periodic breath signal,demonstrated the possibility of passive detecting divers.Based on prominent frequency band of the diver signal,independently using Band-Pass-Filter（BPF） method and Matched-Filter（MF） method to get envelope signal and extract four features from envelope signal＇s spectrum for decision.Lake experiment in Sanya indicated that the four features had difference in detection distance and the farthest range was about 40 meters.Meanwhile,detection performance of MF method was better than BPF method.So it is concluded that restricted to energy level of radialization,the detection range is limited by passive method.
出处
《声学学报》
EI
CSCD
北大核心
2012年第3期301-307,共7页
Acta Acustica
基金
国家自然科学基金资助项目(编号10904159)
