基于直达波旅行时的OBS混合定位方法

An OBS positioning mixed method based on traveltime of direct wave

针对海底地震检波器(OBS)记录的实际地震资料,在利用传统的三点定位法基于直达波旅行时对OBS进行二次定位时,发现由不同的三个炮点确定的同一OBS的位置不唯一,且偏差很大的问题,本文提出了基于直达波旅行时的OBS混合定位方法,利用三点定位法、最小平方法和搜索法的优点,克服了由直达波旅行时拾取误差、炮点坐标误差及海水的声波速度误差造成的三点定位法确定OBS位置不唯一的问题,搜索出最佳的声波速度和最佳的OBS位置,提高了OBS的定位精度,是一种简单且容易实现的OBS定位方法。

When the traditional three-point positioning method is used to calculate ocean bottom seismograph(OBS)based on the travel-time of direct wave,it is often found that calculated OBS positions are not unique,and sometimes they have great errors.To solve this problem,a mixed positioning method based on the travel-time of direct wave is proposed in this paper.Jointly using the three-point locating method,the least square method and searching method,the non-unique problem caused by direct wave travel-time errors, shotpoint errors of and sound wave velocity errors is solved.The optimal OBS position and the optimal sound wave velocity are found.Application results show this method is an efficient and simple way for improving OBS positioning precision.