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Base-Station Random Placement Effect on the Accuracy of Ultrawideband Body-Centric Localization Applications

2018; IEEE Antennas & Propagation Society; Volume: 17; Issue: 7 Linguagem: Inglês

10.1109/lawp.2018.2843881

1548-5757

Richa Bharadwaj, Sritrija Swaisaenyakorn, John C. Batchelor, Shiban K. Koul, Akram Alomainy,

Microwave Imaging and Scattering Analysis

This letter presents an investigation on the effect of random placement of base stations on three-dimensional body-centric localization in the ultrawideband frequency range. Different base station configurations are studied (varied in xyz-axis, xy-axis, and z-axis direction), keeping the same range estimation error values as obtained from the body-centric localization experimental data in order to keep the main focus on the influence of the base-station configurations. It is observed that random positions of the base stations in the z-axis lead to higher localization error (3-8 cm) as the target nodes are spread out more in the z-axis direction. The localization error is analyzed in terms of geometric, horizontal, vertical dilution of precision (DOP), which is a measure of effectiveness of the placement of the base stations. For the DOP values (5-15), 1-3 cm error reduction is observed, and for higher DOP (>20) values, the error increases by 3-5 cm for short-range communication. Further analysis is carried out by varying the range estimation error in terms of mean value and standard deviation for evaluating the random base-station configurations, which also plays an important role in the accuracy of estimating the location of the target.