Research on Indoor 3D Positioning Algorithm Based on Bluetooth RSSI/AOA

Abstract

In order to expand the two-dimensional positioning algorithm RSSI and AOA into a three- dimensional positioning algorithm, this paper proposes an indoor three-dimensional positioning algorithm based on the combination of RSSI/AOA and Bluetooth communication technology. The algorithm uses the two-dimensional AOA angle measurement algorithm to measure the elevation angle between the unknown node and the beacon node, uses the strength of the RSSI signal received by the circular array antenna, measures the azimuth angle between the unknown node and the beacon, and uses the RSSI algorithm to measure the unknown node To reach the distance between the beacon nodes, the three-dimensional coordinates of the node to be measured are finally solved based on the three-dimensional node algorithm proposed in the article. In the algorithm in this paper, only one beacon node and a special circular array antenna are used, and the cooperation between multiple beacons is not required, and three-dimensional positioning in indoor space can be realized. Experimental results show that the accuracy of the algorithm is higher than the traditional RSSI algorithm and TDOA algorithm.