A High-Precision Real-Time Distance Correction Three-Dimensional Localization Algorithm Based on RSSI for WSNs

Abstract

In order to reduce the wireless localization error caused by RSSI, which is easily affected by environmental factors, a real-time distance correction three-dimensional localization algorithm is put forward. The algorithm configures reference nodes optimally and uses the Gaussian Model to filter values of RSSI received by nodes. Then distance data is corrected in real-time, the ill coefficient matrix correction and the maximum likelihood estimation are combined to determine unknown nodes preliminarily. After that, filtering and elimination technique are used to process location results, which effectively improve the localization accuracy. Experiment result proves that the algorithm has an excellent precision of 92.9 %, it also has characteristics of a shorter locating time, a lower hardware cost and energy consumption. So, the algorithm is of great stability and practicality.

Keywords

• WSN
• RSSI
• Three-dimensional localization
• Distance correction
• Gaussian Model.