A DEEP-TOWED SIDE-SCANNING SONAR FOR DEEP-SEA TOPOGRAPHICAL SURVEY

Deep-Towed Side-Scanning Sonar(DTSSS)for topographical survey has the feature of highresolution by using a deep-towed operating mode.The DTSSS can be operated on both sides anda variety of applications has been found.It consists of an underwater towing system,a transmittingsystem,a receiving system and a dry electric spark recorder.The excellent underwater towing systemallows the DTSSS to operate in any region at depths of less than l000m.The working range oneach side is 500m.Combining it with echo sounder the DTSSS can be used to survey the local terrainof the bottom in water depths of l000m and provide information in detail.If using a short cableinstead of a long one,the DTSSS can be operated in shallow water then its source level can be raised6 dB and its working range on each side can be increased to 750m.Furthermore it can also beused as an underwater acoustic measuring instrument in order to investigate sea-bottom reverbera-tion and the behaviors of deep scattering layers.     

大深度拖曳式深海地貌仪

研制成的深海地貌仪,采用大深度拖曳工作方式,具有高分辨率特点.它双侧工作,用途广泛.仪器包括水下拖曳系统、发射系统、接收系统和干式电火花记录器四个部分.性能优良的水下拖曳系统,使仪器能在水深1000m以内的任何海区工作.每侧作用距离500m.在测深仪的配合下,能够对水深1000m的局部海区的海底地貌进行详细观察,提供资料.需要在浅海使用时,换用短电缆,声源级可提高6dB,每侧作用距离增加到750m,即成为一种浅海地貌仪.同时,它还可作为水声测量仪器,可用于研究海底混响和深海散射层.     

宽带Doppler容限信号源

本文叙述了一种合成雷达和声响所使用的宽带Doppler容限信号源的方法.即用数字化办法,用通用计算机设计所需要的信号波形,将信号离散化,编码存贮于ROM存贮器里.发射时从ROM存贮器里取出,经过合适的处理进行发射,这个方法对合成复杂的信号是很方便的.一般说来可推广于实现任一个所希望的信号.我们实际合成了这种信号.对控制这个信号的三个参数,根据具体条件作了计算和说明.