声纳浮标主体及低频水听器是海洋地壳探测设备的海上接收及发射部分。其中,声纳浮标是浮于水面传输地震信号的部分,有的叫做上面部分;水听器及其前置放大器与重物属于水下部分,主要功用是接收震源激发的地震信号,此信号经放大后通过电缆输送到浮标体的控制器,这个部分有的称为水下或下面部分。现分述之; The sonobuoy body and the low-frequency hydrophone are the marine receiving and transmitting parts of the marine crustal detection equipment. Among them, the sonobuoy floats on the surface of the seismic signal transmission part, some are called the above part; hydrophone and its preamplifier and heavy belong to the underwater part, the main function is to receive seismic excitation signal, the signal Enlarged and delivered by cable to the buoy body controller, some of this part is called underwater or below part. Now described;