Trilateration System Based on Bluetooth Distance Measurement Principle.

With the development of indoor positioning space, the demand for indoor positioning is increasing day by day. Indoor positioning solutions (IPS) have been applied in many scenarios, such as intelligent business super intelligent buildings intelligent hospitals and so on. Low power consumption of Bluetooth can be seen everywhere in life. Compared with other technologies, it has obvious advantages such as high availability, high positioning accuracy and low power consumption. In this paper we focus on a Bluetooth ranging solution by studying the Phase Based Distance Estimation (PSDE) principle, establishing Multiple Connections between the base station and the tag, then solving for the tag coordinates based on the Trilateral Ranging (TR) principle, and also proposing a data error handling approach for range error solving. Through trilateral positioning, we can obtain the tag's position and visualize the map using the drawing display. According to the data results, the absolute distance between the tag's calculated position and the actual position is no more than 1m. Applying the above solution approach, Bluetooth ranging can effectively improve the positioning accuracy and provide new ideas for the application of ranging solutions in positioning.