Abstract
To improve the cost and accuracy in the positioning method of wireless sensor network in automatic devices, we proposed an improved distance based positioning method. We analyzed the positioning algorithm based on RSSI, TOA, TDOA, AOA distance measure. Due to different geographic shape, the right trajectory is important to the algorithm. We replaced hyperbola curve with asymptote in this study because the hyperbola positioning algorithm is not energy efficiency. We designed the positioning process of asymptote line algorithm. For the computational complexity, the hyperbola asymptotes are judged by the intersection point, which has an additional step compared to the maximum likelihood method. However, the maximum likelihood method must calculate the quadratic equations. The simulation results show that the algorithm proposed in this study is better than maximum likelihood method in positioning accuracy and the two algorithms have the same computational complexcity. The process of positioning presented in this study is simple and has a low cost.
Highlights
Wireless sensor network is a network composed of a large number of cheap wireless sensor nodes
The positioning method of wireless sensor network is divided into range based and range free positioning methods
If the transmission between mobile anchor nodes and unknown nodes is the transmission of non line of sight, it needs to transmit the information through the refraction of obstacle and reflection
Summary
Wireless sensor network is a network composed of a large number of cheap wireless sensor nodes It is a kind of computer network composed of many automatic network device randomly distributed in space. The development of wireless sensor network originated in battlefield monitoring and military applications It is used in many fields, such as environmental and ecological monitoring, health monitoring, home automation, bio medical, emergency rescue and disaster relief, remote control of hazardous area, traffic control and so on [2]. It is a hot research field in the world, which involves many disciplines, high cross and highly integrated knowledge. This project is based on range based positioning method, and has improved in positioning cost and positioning accuracy
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