Publication: Study of multilateration technique
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Date
2010-04-01
Authors
Rodzali, Ammar Rasydan
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Abstract
When describing about wireless sensor network, localization is an important issue to be discussed. Localization in low-cost sensor nodes without additional hardware is difficult since positioning sensor nodes requires distance information to reference points. The most suitable method to meet this demand is by using the RSSI values to determine the distance between sensor nodes. There are several factors to put into consideration while implementing RSSI method which affect the RSSI value to get high quality MLAT results. In the area of localization, one technique to obtain better positioning that has similar approach to MLAT is TRILAT. But TRILAT technique has its limitation in that at least three beacons are needed to determine an object’s location. Furthermore, distance estimation always contains error that will lead to location errors. By this limitation, the TRILAT technique will be inaccurate in comparison to MLAT with respect to some factors such as node orientation and measurement quality. MLAT technique is proposed to relieve this limitation of TRILAT technique and significantly improve localization performances. The results from comparing both techniques show that MLAT does improve the limitation of TRILAT by some margin. By taking the averages of the simulation results, the most effective approach in conducting localization is by using 10 reference nodes.