CAJ | 학술논문

　　多途效应和混响是浅海声信道最为突出的2个特点，它们会造成水下声信号传播畸变，严重影响信号分析和检测。基于此，利用非消声水池试验展现了水下信道多途效应会造成信号频谱展宽，引起水下声纳信号检测性能下降的特点，通过理论分析并依据湖海试数据表明，运动声纳的近场混响具有强非平稳性，点谱展宽会更加明显，但随着时间推移，混响的多普勒展宽将会变小，所以不能利用基于平稳性假设的混响模型算法来抑制混响。本文的研究可为声纳抗多途、抗混响以及声纳在水下航行器上的应用提供参考。
　　다도효응화혼향시천해성신도최위돌출적2개특점，타문회조성수하성신호전파기변，엄중영향신호분석화검측。기우차，이용비소성수지시험전현료수하신도다도효응회조성신호빈보전관，인기수하성납신호검측성능하강적특점，통과이론분석병의거호해시수거표명，운동성납적근장혼향구유강비평은성，점보전관회경가명현，단수착시간추이，혼향적다보륵전관장회변소，소이불능이용기우평은성가설적혼향모형산법래억제혼향。본문적연구가위성납항다도、항혼향이급성납재수하항행기상적응용제공삼고。
To improve the detection performance of underwater unmanned vehicle (UUV) sonar, the frequency characte-ristics of shallow water acoustic channel is analyzed. Shallow water acoustic channel is more complex than blue water acoustic channel. Due to multipath effect and reverberation, the propagation of acoustic wave is often deformed, result-ing in degradation in signal detection performance of sonar. The frequency characteristics of underwater acoustic chan-nel are analyzed with the data from tank experiment, lake and sea trials. Tank experiment shows the spread of signal frequency spectrum due to multipath effect. The data from lake and sea trials show that for the high-speed active sonar, the short-range reverberation is highly non-stationary, and the spread of point spectrum becomes more obvious. But the Doppler spread decreases with time. Therefore, the reverberation model algorithm based on stationarity assumption cannot be used to suppress the underwater vehicle sonar reverberation.