基于多项式曲线拟合的海上地震勘探拖缆定位EI北大核心CSCD

海上拖缆地震勘探作业过程中电缆在形状上通常呈现为光滑的曲线,传统的拖缆定位大多基于坐标递推的数值方式,对声学距离、罗经鸟方位角等观测值的建模在理论上不够严密。为使观测值得到更加充分的利用,本文提出一种基于多项式曲线拟合电缆形状的平差定位模型。使用我国南海某工区海上拖缆勘探作业的实际数据进行测试,结果表明,本文模型估计的检波点位置精度约4.5 m,与传统模型相比精度最大改善率为58.1%,因此,本文模型能够更好地保障高精度海上地震勘探作业的顺利进行。

Offshore towed-streamer seismic positioning based on polynomial curve fitting

In offshore towed-streamer seismic exploration, the streamers are generally smooth curves in shape. Traditional streamer positioning approaches often recursively compute the coordinates by numerical integration, in which observations such as acoustic distance and compass azimuth cannot be rigorously modeled in theory. To make full use of these observations, a rigorous adjustment positioning model based on polynomial curve fitting is proposed. The experimental results based on survey datasets demonstrate that the positioning accuracy of the seismic point estimated by the new algorithm is about 4.5 m, and the maximum accuracy improvement rate is 58.1% compared with the traditional algorithm. Therefore, the new algorithm can better ensure the progress of the high-precision offshore towed-streamer seismic exploration.