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Location systems are becoming increasingly sought today to ensure the location of distant objects, to facilitate the management of personnel and their products, increase the productivity, etc. These systems are known as AVL (for vehicle location) and generally the RTLS (for Real-Time Location of Several objects). These systems can be divided into two approaches: positioning approach by satellites, such as GPS, and positioning approach by WSN (Wireless Sensor Networks) that use networks of wireless sensors. This second approach is divided into two categories: coarse-grained and fine-grained.
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