摘要
利用目标前向散射的扰动声线法适用于在浅水信道对目标进行定位,但所得到的声压敏感核声图的交汇效果易受水底地形不匹配的影响,提出了一种基于图像处理的目标定位方法。首先利用多次的单阈值Otsu方法对多阈值Otsu方法进行改进,确定备选区域;然后从备选区域中选择扰动声线穿过最多的区域并计算重心。仿真结果表明该定位方法不但能够正确定位目标,减小人工判断声图的工作量,而且同样适用于声压敏感核声图交汇效果较差的情况,能够辅助人工判断来减少误判。
Perturbed eigenrays method using target forward scatting is suitable for target localization in shallow water waveguide.However,on the sonogram,the intersection of pressure sensitivity kernels is easily affected by bottom model mismatch.To solve this problem,this paper proposes a method of target localization based on sonogram processing.Instead of multi-threshold Otsu method,this work determines alternative areas by applying single threshold Otsu method repeatedly,and then computes the gravity center of the area with most perturbed eigenrays.Simulation results suggest that this method can not only locate targets precisely and reduce manual workload when the sonar image is clear,but also help make decisions when the intersection of perturbed eigenrays is complicated.
引文
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