多波束测深Ping周期内姿态变化对水深的影响分析

Analysis of the Influence of Multi-beam Transducer Attitude Change in Ping Period on Sounding Results

多波束系统波束发射与接收为独立过程,同时受海洋环境的影响,波束发射接收期间(Ping周期)换能器姿态存在动态变化,特别是对于具有发射导向作用的设备,其综合作用对水深结果的影响更大。现有研究通常将发射与接收换能器作为一个整体,仅考虑部分瞬时时刻的姿态,忽略了Ping周期内姿态变化的影响,具有一定的局限性。本文结合多波束测量原理及两种波束归位模型,利用仿真实验与实测数据,研究多波束测深Ping周期内姿态变化及发射导向对水深结果的影响。实验结果表明:在浅水区(小于200 m)二者影响可近似忽略,但随水深增加其影响可造成近10%测深结果 (尤其是边缘波束)超出规范要求。本文研究内容为后续多波束数据精细化处理提供一定的参考。

In multi-beam system,beam transmitting and receiving are independent processes.At the same time,due to the influence of Marine environment,the attitude of the transducer changes dynamically during beam transmitting and receiving(Ping period).Especially for the equipment with the function of transmitting and guiding,the comprehensive effect has a greater impact on the water depth results.The existing researches usually take the transmitting and receiving transducers as a whole,and only consider the attitude of some instantaneous moments,ignoring the influence of attitude change within the Ping cycle,which has certain limitations.In this paper,combined with the principle of multi-beam measurement and two types of beam homing models,using the simulation experiment and measured data,the influence of attitude change and launch orientation on the water depth results during the Ping period of multi-beam sounding is studied.The experimental results show that in shallow water(<200 m),the two effects can be approximately ignored,but with the increase of water depth,nearly 10%of sounding result(especially the edge beam)can exceed the specification requirements.The research content of this article provides a certain reference for the subsequent fine processing of multi beam data.