Abstract
Recently, there has been much focus on mobile sensor networks, and we have even seen the development of small-profile sensing devices that are able to control their own movement. Although it has been shown that mobility alleviates several issues relating to sensor network coverage and connectivity, many challenges remain. Among these, the need for position estimation is perhaps the most important. It is too expensive to include a GPS receiver with every sensor node. Hence, localization schemes for sensor networks typically use a small number of seed nodes that know their location and protocols whereby other sensor nodes estimate their location from the messages they receive. In this paper, we propose a new technique to localize mobile sensor nodes using sectorized antenna. We consider that both sensor nodes and seeds are mobile, and argue that mobility can be exploited to improve the accuracy and precision of localization. It is tested extensively in a simulation environment and compared with other existing methods. The results of our experiments clearly indicate that our proposed approach can achieve a high accuracy without need of high density of seeds.
Highlights
Mobile wireless sensor networks (MWSNs) are a particular class of wireless sensor network (WSN) in which mobility plays a key role in the execution of the application
Localization schemes that provide high-accuracy positioning information in WSNs cannot be employed by mobile sensors, because they typically require centralized processing, take too long to run, or make assumptions about the environment or network topology that do not apply to dynamic networks
We propose a new distributed range free technique to localize sensor nodes with the help of seeds that attached with sectorized antenna
Summary
Mobile wireless sensor networks (MWSNs) are a particular class of wireless sensor network (WSN) in which mobility plays a key role in the execution of the application. Some localization techniques have been proposed to allow sensor nodes to estimate their locations using information transmitted by a set of seeds that know their own locations (for example, the seeds can have GPS receivers). They all suffer from one or both of the following problems: 1) Dependence on special hardware: Techniques that depend on measuring ranging information from signal strength [23], the time of arrival [24], time difference of arrival [25], and angle of arrival [26] require hardware that is typically not available on sensor nodes.
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