南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (1): 101.
高 丽1,何为凯1,2*,张智伟3,李睿奇2,卢红旺2,颜 振2
Gao Li1,He Weikai1,2*,Zhang Zhiwei3,Li Ruiqi2,Lu Hongwang2,Yan Zhen2
摘要: 现在使用的智能天线主要通过对阵列天线相位的调制进而调节声场波束,而不同种类蝙蝠仅通过两个外耳对声音反射,就对声场波束形成起到重要作用,所以研究不同种类蝙蝠外耳对接收回波调节作用的声学共性对智能天线改进具有重要作用.共选取30只蝙蝠外耳,利用有限元声场模拟得到蝙蝠声场波束,并对声场波束的指向进行归一化和球面小波压缩,初步利用主成分分析法应用到不同种类蝙蝠的特征分析中,通过主成分分析方法得到蝙蝠本征波束以及平均声纳波束,并对本征波束进行了叠加分析,只考虑了最大本征值和第二本征值对应的第一和第二本征向量,并分析了其作用,分析表明:1)第一本征向量的叠加明显调整了主瓣的宽度,而第二本征向量的叠加则使主瓣在方位角和仰角方向的宽度交替变化;2)在本征空间中,距离远近表示声场波束相似程度,本征波束的分析对区分不同属的蝙蝠具有一定作用.
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