Design And Implementation Of Indoor Localization System Based On Ultrasonic Technology In WSNs

Wireless Sensor Networks (WSNs) is collected by a number of sensor nodes which have certain topology. Nodes which cooperate with each other can sense, measure, and obtain the information of environment and mobile target in the area.It is apparently different characteristic and requirements between localization in WSNs and other traditional localization approach. Sensor nodes need to achieve low-cost, save-power and easy implementation. Now, it is a problem for small mobile robot localization and tracking. Expensive sensor devices are for expensive robot. There is need for low-cost, high precision localization system. Because of this, we developed MUTE localization system platform which based on WSNs technology, ultrasonic sensor technology, and data analysis technology.MUTE uses TOA (time of arrival) technology, like GPS localization. This thesis will descript architecture and design of this system, which contain hardware, software, data structure and interface, and tools.Because the resources of nodes based on IEEE 802.15.4 are limited, it's difficult to maintain network performance, while increasing nodes. Heterogeneous sensor networks, the potential solution, may build network with large numbers of inexpensive wireless sensor nodes while maintaining a high level of network performance. MUTE have topology architecture of cluster tree, and heterogeneous sensor networks.There are not only static sink nodes, but also mobile sink nodes. Mobile robot will not merely be the tracked target; it can also receive and process the network data through mobile sink node. MUTE offers supporting for dynamic cooperation study between robot and WSNs.We analyzed reference paper and developed a suit of ultrasonic localization sensor array, and software based on .net technology that can dynamic demonstrate the data processing and algorithm compensation. The real experiment indicated the 2D localization accuracies achieved 3.7975cm.