CAJ | 학술논문

针对浅海条件下利用水平阵对水下目标进行噪声源近场高分辨定位会受海面、海底形成的多途效应影响，致定位结果具有严重的背景起伏甚至出现虚假目标问题，在建立水平阵近场柱面聚焦测量模型基础上，分别研究适用于单频线及宽带连续谱信号的水平阵柱面聚焦定位方法，即将幅度补偿引入MVDR（Minimum Variance Distortionless Re-sponse）近场聚焦波束形成中，充分利用声波幅度信息及相位信息，并据基于射线理论的虚源法建立水声相干多途信道模型与静态介质中波传播的互易性及时反不变性，生成与水声信道特征信息相匹配的空间聚焦导向矢量。结果表明，该方法可有效克服多途效应影响，实现柱面声源高分辨定位。
침대천해조건하이용수평진대수하목표진행조성원근장고분변정위회수해면、해저형성적다도효응영향，치정위결과구유엄중적배경기복심지출현허가목표문제，재건립수평진근장주면취초측량모형기출상，분별연구괄용우단빈선급관대련속보신호적수평진주면취초정위방법，즉장폭도보상인입MVDR（Minimum Variance Distortionless Re-sponse）근장취초파속형성중，충분이용성파폭도신식급상위신식，병거기우사선이론적허원법건립수성상간다도신도모형여정태개질중파전파적호역성급시반불변성，생성여수성신도특정신식상필배적공간취초도향시량。결과표명，해방법가유효극복다도효응영향，실현주면성원고분변정위。
Themultipatheffectiscausedbythesurfaceandthebottomofthesea.Whentheunderwatertargetisin shallow water,the localization of the noise source is usually influenced by the multipath effect,so that the use of horizontal array to achieve near-field high-resolution localization will be restrained.In that case,serious background fluctuation may appear and even a false target may be reached.On the basis of establishing a measurement model,the cylindrical focused beamforming localization method was introduced for both narrowband and broadband signal.In the method,on the one hand,the amplitude compensation was applied to the MVDR to fully utilize the amplitude and phase informations,and on the other hand,based on the method of image source and the reciprocity of wave propagation,a spatial focused steering vector was constructed in accordance with the characteristics of underwater acoustic multipath channel.The simulation demonstrates that the method can overcome the multipath effect and achieve the high-resolution localization of cylindrical noise source.