OBC海底电缆施工采用机械放缆方式将电缆连同检波器铺设到海底,由导航Gator系统记录下检波器离开放缆船的位置,作为一次定位结果。检波器铺放在到达海底的过程中,会受到水流,潮汐等的影响而偏离设计位置,需要二次定位来确定其在海底的准确位置,为后期资料处理和解释增加可信度。然而二次定位的结果会因为外部条件的影响而发生质的变化,本文详细阐述了声学二次定位中遇到的问题及相应的解决办法。 OBC submarine cable construction using mechanical way to put the cable along with the detector to the seabed, the navigation Gator system records the detector left the position of the cable car as a positioning results. When the detector is placed on the seabed, it will be influenced by water currents, tides and the like and deviate from the designed position. The secondary positioning is needed to determine its exact position on the seabed and increase the credibility for later data processing and interpretation. However, the result of secondary positioning changes qualitatively due to the influence of external conditions. This paper elaborates on the problems encountered in acoustic secondary positioning and the corresponding solutions.