Due to the close integration of sensor networks with the real world, the categories time and location are fundamental for many applications of sensor networks, to interpret sensing results or to coordinate sensor nodes in Wireless Sensor Networks (WSNs). Time synchronization and sensor node localization are fundamental and closely related services in sensor networks.The most relevant techniques for Localization in Wireless Sensor Networks - lateration, angulation and scene analysis are discussed. A comparison is made between several localization systems. A choice for a certain system or technique depends on the intended application. A possible system for determining the position of a moving device is given. The system's possible advantage over most other existing systems is short deployment time in a new environment and reasonable accuracy. It could be used for indoor and outdoor environments. Improvements can be made with respect to accuracy and mobility.
wireless sensor networks, space-time localization, localization methods
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