摘要
极浅海楔形海底环境中水体的不均匀性和界面影响导致多途现象严重,目标回波信号分析提取变得非常困难。针对上述问题,提出子信道建模与目标亮点模型相结合的回波仿真方法。将声信道划分为发射信道和返回信道两个子信道;利用射线理论对信道进行建模,并根据声传输衰减规律确定信道主要本征声线的分布;最后结合目标散射强度与声波入射角度的关系,确定返回信道中能够到达某一接收位置的回波。利用上述方法对单频矩形脉冲信号照射到典型柱状障碍物目标的回波进行了仿真研究,仿真结果和理论分析表明,建立的目标回波模型对极浅海环境中典型柱状目标具有有效性。
Echo characteristics of targets in the extremely shallow water are affected by the inhomogeneity of water medium and the interfaces, and the analysis and extraction of target echo become very difficult because of the serious multi-path phenomenon. A shallow sea multi-channel model, which can be divided into two sub-channels, transmit channel and reverse channel, is proposed in this paper. Modeling the sub-channels by the ray theory, the main eigen-rays of the sub-channels were obtained based on the attenuation law of sound wave transmission. Then according to the relationship between target scattering characteristics and the angle of incident acoustic wave, the echo of a typical columnar obstacle target was simulated under the single-frequency rectangular pulse transmitting signal. The validity of the proposed method was verified through the theoretical analysis of the simulation results.
作者
王迎迎
黄勇
刘纪元
张春华
WANG Ying-ying;HUANG Yong;LIU Ji-yuan;ZHANG Chun-hua(Institute of Acoustic,Chinese Academy of Science,Beijing 100190,China;Key Laboratory of Advanced Underwater Information,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China)
出处
《计算机仿真》
北大核心
2020年第10期142-146,共5页
Computer Simulation
基金
国防预研项目(Y7Z3231211)。
