Improving Positioning Algorithm Based on RSSI

Nowadays, a large number of positioning studies based on RSSI technology mainly focused on the coordinate position by measuring the distance using the certain algorithm. The difference between calculated distance and real distance became rather lager due to the poor solution to improve the impact of environment to RSSI, and the bad repeatability. Resulting in the inaccuracy of positioning. According to the RSSI distance measurement technology and Zigbee communication technology, this paper investigated the distance between the unknown node and anchor node based on the “RSSI-Distance”. As the distance was less than 10 m or not, the position can be calculated by the “Mini-Max Positioning Method” or “Maximum Likelihood Estimation Method”, respectively. The results showed that this accuracy of this positioning system can be limited within 3 m.