中文摘要：

多波束测深波束位置计算精度取决于波束归位模型优劣。现有波束归位大多采用严密的转换模型,虽然计算精度高,但转换繁琐;少数采用近似的转换模型以简化转换过程,但由于仅考虑子午线收敛角的影响而忽视了高斯投影时距离变形的影响,计算精度较低。针对上述问题,本文提出一种近似转换模型,顾及投影变形对测量距离的影响,并给出距离改化近似公式以简化计算过程。实验结果表明,与严密转换模型相比,该近似转换模型计算结果平面偏差最大约1cm,满足现有相关测量规范规定的精度要求。

英文摘要：

The accuracy of position calculation of multibeam echosounding depends on beam homing model.The accurate conversion model adopted by most of the existing homing calculations has high precision but a relatively complex process.The approximate conversion model only used by a few homing calculations can simplify the calculation process but has lower accuracy because it only considers the effect of meridian convergence angle but neglects the effect of distance deformation in Gaussian projection.To solve these problems,this paper proposed a new approximate conversion model which not only considered the effect of projection deformation on distance measurement but also gave the distance changing formula to simplify the calculation process.The results show that compared with the accurate conversion model,the calculated plane bias of this proposed conversion model is about 1cm,which meets the accuracy requirements of existing related norms of surveying.