【作者】 侯倩男； 吴金荣； 张建兰； 殷丽君； 张朝金；

【Author】 HOU Qian-nan;WU Jing-rong;ZHANG Jian-lan;YIN Li-jun;ZHANG Chao-jin;Key Laboratory of Underwater Environment,Institute of Acoustics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 中国科学院声学研究所水声环境特性重点实验室； 中国科学院大学；

【摘要】 海洋混响平均强度受背景环境噪声的影响较大,尤其是在混响信号被噪声信号淹没的时候,即混响噪声比(简称混噪比)比较低的条件下,混响平均强度的衰减速率减小,改变其衰减规律。实验数据处理和理论分析表明混响噪声比在大于10 dB的前提下,混响平均强度数据可靠。在混响噪声比小于10 dB的时候,噪声强度的影响不可忽略。对低混噪比条件下的混响平均强度进行噪声修正,能够有效延长混响时间,获得混噪比大于-10 dB的混响平均强度衰减曲线,凸显目标回波。更多还原

【Abstract】 Reverberation average intensity has always been influenced by ambient noise in ocean,especially happened prior to submerged when the Reverberation-to-Noise Ratio(RNR)is quite low.The reverberation average intensity becomes decay slowly and the orderliness has changed evidently due to the superposition of ambient noise intensity.Experiment data and theory analysis propose that the reverberation data is reliable when RNR is larger than lOdB and there is no consideration about noise effect,while the influence of ambient noise cannot be ignored when RNR is less than lOdB.A ambient noise corrected for reverberation average intensity has been made to extent reverberation duration effectively,acquires the unadulterated reverberation average intensity decay with RNR is not less than-10 dB and spotlight the echo whose intensity is less than noise.更多还原