一种利用回波时间反演多波束横摇角度的方法

A method for inverting the roll angle of multi-beam by using echo time

针对传统多波束测深系统中对横摇偏差进行改正,存在校准后仍在航行过程中受外界因素干扰,以及改正模型未考虑声速不同导致声线跟踪法计算过程中的水层分层与声线弯曲影响,直接利用深度值进行计算使得改正精度不高的问题。提出了以检测线中央波束数据作为真实海底地形的参考,通过声线跟踪得到主测线在不同入射角度的回波时间,进而利用入射角度和回波时间的关系,反演得到横摇偏差角进行改正的方法。实验表明:利用回波时间对多波束测深数据的横摇偏差进行改正,通过声线跟踪结合检测线中央波束,能够进一步提高横摇偏差改正的精度。

Aiming at traditional multi-beam sounding system for roll bias calibration after still interference by external factors in the process of sailing,and correct the model did not consider the speed of sound of different lead to sound ray tracing method to calculate the water in the process of stratification and the sound ray bending effect,direct use depth value to calculate the correction precision is not high.In this paper,the echo time of main survey line at different incidence angles is obtained by using the central beam data of the detection line as the reference of the real seabed topography,and the method of correcting the roll bias Angle is obtained by using the relationship between incidence Angle and echo time.The experimental results show that the accuracy of roll bias correction can be further improved by using echo time to correct the roll bias of multi-beam bathymetry data and by using acoustic track combined with the central beam of detection line.