一些盲人具备类似于蝙蝠的回声定位能力，他们通过嘴巴发出声音、耳朵接听回声，实现对周围环境和目标的感知。目前，对盲人回声定位的研究多数是从行为学和脑神经学的层面考察盲人在不同感知任务中的回声定位能力，缺乏对其中的认知信号处理方法及其内在机理的研究。本项目以盲人回声定位为研究对象，在前期研究工作的基础上进一步开展以下研究内容：（1）研究面向盲人回声定位的回声建模方法，模拟产生进入人类听觉系统的回声信号；（2）研究对盲人回声定位其关键作用的听觉回声特征的表征与提取方法；（3）针对目标距离识别和形状识别两种典型的盲人回声定位感知任务，研究其依赖的回声特征以及相应的信号处理方法，并对其内在机理提供合理解释。本项目研究有助于帮助盲人提升自身认知能力，具有积极的社会意义；所研究的方法对该领域的进一步发展和开拓具有重要的科学意义和学术价值，相应的成果在雷达、声呐等领域具有重要的应用前景。

Like echolocating bats, some blind humans are capable of echolocation. By making a click with their tongue and listening to returning echoes, they can perceive their silent surrounding and target. To date, most researches are describing the echolocating ability of the blind for certain tasks with behavioral and neural methods, lack of study on the cognitive signal process and inner mechanism. Based on previous work, we will focus on the following research contents: (1) Study an echo modeling method for human echolocation, generating echo signals which arrive at human ears; (2) Study how echo features that determine echolocation are represented and extracted in the auditory system; (3) Study the signal processing methods for tasks of distance and shape recognition respectively and reveal some inner mechanism. Our research is helpful for the blind to enhance their cognitive ability and thus of positive social significance. The methods delivered by this research are important not only to the current research of human echolocation in academic value, but also to radar, sonar, and etc. in application prospect.