说明：  海底反射是形成多径干扰的主要因素之一，针对由海底引起的水声通信的多径干扰问题，利用信号多径比（ＳＭＲ）来描述浅海平坦海底、倾斜海底以及深海平坦海底３ 种不同的海底地形对水声通信的影响
(Seafloor reflection is one of the main factors to form multipath interference. Aiming at the problem of multipath interference caused by seabed in underwater acoustic communication, signal multipath ratio (SMR) is used to describe the influence of three different seabed topography on underwater acoustic communication, including shallow flat seabed, inclined seabed and deep flat seabed)