Abstract:

When the maximum likelihood estimate equation was used to solve the unknown node’s position, it was found that the ranging error for the anchor node (reference node) in the last equation has greater impact on the localization error. The maximum likelihood experiment based on received signal strength indication in the reality shows that in the area of 30 m×30 m square positioning, average positioning error decreases from 0.4 m to 1.0 m when the reference node is being set without ranging error.

Key words: wireless sensor network (WSN), localization, maximum likelihood estimation algorithm, reference node, error analysis