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基于无线传感器网络的声源定位系统的设计与实现-电路与系统专业论文.docx

发布:2019-03-26约4.95万字共71页下载文档
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第 第 II 页 些算法进行实现,并最终通过实验进行验证。实验表明,本文系统能够 在室内条件下,对目标声源进行有效的定位,定位精度可达 10cm 以下。 关键字:声源定位, 传声器阵列, TDOA,盲源分离,延时估计 第 第 III 页 DESIGN AND IMPLEMENTATION OF SOUND LACOLIZATION SYSTEM BASE ON WIRELESS SENOR NETWORK ABSTRACT Sound localization is an interesting technology with broad prospects, it locates the position of source via sound signal. Since Sound localization system has advantages of imperceptibility, test non-destructive and so on. It is widely used in many fields in our everyday lives such as military, disaster relief and detecting. Traditional sound localization system is mainly based on microphone array localization technology, the drawback is the large size of array, limitation of coverage and low positioning accuracy. In recent years, with the development of micro-electronics and communications technology, sound localization system based on wireless sensor network technology is becoming a hotspot. Compared with the traditional microphone array technology, it is smaller which means easy to set. It has greater coverage and the positioning accuracy is also higher. At the same time the structure of the whole system can be adjusted to fit the actual environment, so it has better environmental 第 第 IV 页 adaptability. This paper presents a sound localization system which constructs of multiple detecting nodes, and based on wireless sensor networks. The detecting node of this system, is based on a four-element microphone array, it determine the basic information of source, and transmits the information to the control node. And the control node gives out the final position of source. The main flow of system can be divided into 3 parts, pre-processing of signal, delay estimation and localization. This paper first develops algorithms which fits the indoor environment, then test the algorithms with simulation, implements it on the system of ADI Blackfin 527 series DSP, and verified the system through experiments. The Experiments show that this system has a good accurac
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