特征声线搜索以及传播时间测定的精确性是基于声传播时间的声速剖面反演的关键.在具有倾斜海底的三维海域,声线在海底的反射会导致水平偏转,给特征声线搜索和声传播时间计算带来了困难.为此,首先提出一种三维空间特征声线搜索方法.通过对南海海洋环境反演实验数据的处理,分析了声线的水平偏转对声传播时间的影响,并用爆炸声传播时间作为代价函数,用量子粒子群算法作为优化算法进行了声速剖面反演.结果表明,海底坡度较大时,声线的水平偏转对声传播时间影响较大,考虑声线的水平偏转能有效地减小声传播时间计算的误差,进而使得声速剖面反演的精度得到显著提高.%The key procedure for sound speed profile ( SSP) inversion is accurate determination of eigen ray and precise measurement of corresponding transmission time. Horizontal deflection often occurs when a ray propagates in shallow water with an irregular sea bottom, it brings difficult to determine eigen ray trajectory and transmission time. A new method for seeking eigen ray in a three-dimensional space was proposed here. The influences of horizontal deflection on transmission time were analyzed, and then transmission time of explosive sound and quantum particle swarm were used as a cost function and an optimization algorithm, respectively to invert SSP for some area of South China Sea, based on experimental data. Results indicated that horizontal deflection has a critical effect on transmission time when the sea boltom gradient is great; considering horizontal deflection can greatly improve the accuracy of eigen ray transmission time calculation and enhance the precision of SSP inversion dramatically.
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