Abstract
In wireless sensor networks based on nanoLOCTM standard and using server-centric control, the overall performance of radio segment and location accuracy depends amongst other on the efficiency of the location engine. The efficiency may be increased by selecting an appropriate subset of base stations for ranging. This paper describes the experiments dealing with this problem, and discusses the ways of saving radio bandwidth.
Highlights
Modern local positioning systems or RTLS are based on various wireless technologies: WiFi, ZigBee, nanoLOCTM etc
The territory included many buildings especially in zone A. In this region there were no so many places where base stations and a mobile unit were on the line of sight
The second method corresponds to Geometric dilution of precision (GDOP) criterion: the number of base stations which have the lowest GDOP values was selected for measurements
Summary
Modern local positioning systems or RTLS (realtime location systems) are based on various wireless technologies: WiFi, ZigBee, nanoLOCTM etc. The performance of a typical local positioning system based on wireless sensors network depends – amongst many other things – on two factors: available traffic load and the number of calculated locations per second. Nowadays GDOP is widely used as a criterion for choosing the right geometric configuration of base stations in wireless sensors networks [5,6,7,8,9] It can be applied, for example, for evaluating positioning accuracy for different positioning algorithms [5] or for improving.
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