中文摘要：

生物声纳的高灵敏度和高可靠性一直是仿生设计所追求的目标,然而至今仍没有一个令人信服的物理模型能很好得解释生物声纳优越性能的原因,其主要是缺乏对动物听觉系统神经信息编码的认识.本文从蝙蝠听觉神经系统的生理结构出发,用圆映射和符号动力学方法讨论了蝙蝠听觉神经系统在复杂环境中处理多普勒信号的一种可能性方案,并通过计算机仿真证明了其合理性.针对蝙蝠神经系统的不稳定性,用符号动力学的方法分析神经系统信息处理的机理具有良好的鲁棒性和高灵敏度.这种新的信号处理方法的研究,为生物声纳信号的处理过程的进一步认识提供了一种新的解释.

英文摘要：

The high sensitivity and reliability of the biosonar have attracted many bionic scientists’ attention.However,there is no convincing physical model to explain the reasons of the superior performance of biosonar.The main reason is that the neuron coding of the nervous system is still uncertain.Based on the physiological structure of the bat’s auditory nervous system,a probable explanation is proposed to discuss the Doppler signal process with the principle of circle maps and symbolic dynamics.Through the computer simulation,the rationality of this method is proved.For the instability of the nervous system,using symbolic dynamics to analye the mechanism of the neural information processing has high sensitivity and robustness.It is expected that the research of this new explanation will be able to promote the understanding of the biosonar signal processing and its applications.