Filtering the Results of Zigbee Distance Measurements with Ransac Algorithm

Positioning systems are usually based on the satellite observations. However the traditional satellite positioning has some outage, it cannot be used inside buildings or underground. But there are some new technologies that allow for indoor positioning. Among those methods, there is a conception of the RF ranging technology. There are two basic methods of obtaining the distance in RF networks – time of flight (and its variations) and RSSI-based algorithms. The new method to obtain a distance between nodes in RF network is a new ranging approach based on the phase shift measurement. Analyzing the results of the measurements performed with this new technology, it was observed that a large number of them significantly differ from the reference value. Thus, in order to obtain correct distance filtering of the measurement results must be introduced to "smooth" the results. There is a necessity to find an algorithm that filters the observations. The authors present a proposition to use the RANSAC algorithm in the filtration process. In this paper the strategy of the use of RANSAC algorithm was presented. ARTICLE INFO