顾及波束重叠的多波束横向分辨率估计模型

Estimation Model of Lateral Resolution of Multibeam Echo Sounder Considering Beam Overlap

针对当前多波束分辨率模型未考虑波束横向覆盖的重叠,导致横向分辨率估计不准确的问题,提出了一种顾及波束重叠的多波束横向分辨率估计模型。结合多波束等角与等距模式的工作原理,分析了两种模式下测深空间的几何关系,在顾及波束重叠影响基础上推导了两种模式的多波束横向分辨率计算公式。结合算例,研究了不同水深下横向分辨率随波束入射角的变化规律及量级大小。最后从分辨率角度分析了两种模式的优缺点,为多波束测量技术设计及系统技术性能的评估提供参考。

To solve the problem that the current multibeam resolution model did not consider the overlap of beam lateral coverage, which causes inaccurate estimation of lateral resolution,an multibeam lateral resoluion estimation model which took into account beam overlap was proposed.Combining with the principle of multibeam equiangular and equidistant modes, the relationship of sounding space under two modes was analyzed.Taking into account the effect of beam overlap, the calculation formulas of multibeam lateral resolution were derived.With an example, how the resolution changed with incidence angle in different water depth was researched. Finally, the advantages and disadvantages of the two modes were analyzed from the perspective of resolution, which provided reference for the design of multibeam measurement and the evaluation of system performance.