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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。
In order to detect the target of underwater frogman with respirator, the basic principle of acoustic signal of frogman’s respiratory radiation was experimentally studied, and the passive detection method of underwater frogman was proposed based on the respiratory periodicity of frogman. The periodic acoustic signal of frogman’s breathing was obtained in the pool experiment, demonstrating the feasibility of passive detection. Because of the significant frequency band of the frogman’s breathing sound signal, the envelope of the periodic signal is obtained by using the band-pass filter and the matched filter respectively, and the four types of features of the envelope signal spectrum are extracted for decision. Sanya Lake test results show that there are differences between the four types of detection of the frogman detection distance, the farthest can be detected in the vicinity of 40m frog, and matching filter detection performance is better than the bandpass filter. CONCLUSIONS: Due to the energy level of the radiation source, passive detection of frog humans is limited.