Objective To improve landing ability of amphibious equipment under severe sea state and dark night in al-lusion to low automation and incapability of being adaptive in all weather conditions. Methods The ultrasonic localiza-tion signal of landing ship was received by underwater detection device to obtain actual position of amphibious equip-ment, so as to avoid underwater barriers in route and improve guiding efficiency and accuracy effectively. Results Aiming at the fact that parts of the ultrasonic signal was received by underwater ultrasonic receiver, this paper studied on the ef-fects on propagation characteristics of acoustic signal by factors of seawater, sea noise and oceanic reverberation. The seasonal sound speed profile (SSP) and acoustic transmission loss (TL) were analyzed emphatically. Mathematical mod-eling on reverberation level of ambient sea noise, seabed and sea level was completed. The derivation accuracy and data reliability were verified by static and dynamic tests. Conclusion Derivation of shallow sea multipath propagation signal synthesis model and double-path propagation signal degradation mode lays a foundation for solving the wave equation of propagation model.%目的 针对两栖装备上下登陆舰时自动化程度低、无法全天候实施的问题,提高恶劣海况和黑夜条件下的登舰作业能力,提出一种两栖装备入舰引导系统设计方案.方法 依托装备再制造升级技术手段,通过水下探测器接收登陆舰发射的超声波定位脉冲信号,获得装备相对位置和路线规划信息,有效规避航线水下障碍物,提高装备登舰的准确度和效率.结果 针对系统发出的超声波信号部分被水下超声接收器接收的情况,对海水、海洋环境噪声和海洋混响等因素对声波信号传输特性的影响展开研究,重点分析了浅海海域的季节性声速剖面、传播过程中的声强损失,对海洋环境噪声、海底和海面的等效平面波混响级进行数学建模,通过静态和动态试验,验证了模型推导的准确性和数据的可靠性.结论 通过浅海多径传播信号合成模型和双路径传播的信号衰减模式的推导,为求解声波传播模型的波动方程奠定了基础.
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