Author(s)

Rui Gan, Jun Gao, Jiawei Shi, Linwen Lu and Maorui Fu

Corresponding Author

Jun Gao

ABSTRACT

Aiming at the problem that the indoor three-dimensional positioning algorithm is complex and the accuracy is not high, this paper proposes a three-dimensional wireless positioning method based on symmetric Bluetooth base station. First, several groups of Bluetooth base stations are placed symmetrically in the x, y, and z directions of the spatial three-dimensional Cartesian coordinate system. The base station in the x-axis direction needs to set its x coordinate, and the base stations in the y and z directions are correspondingly set with y and z coordinates. In the space, the base station detects the RSSI value of the tag Bluetooth signal, obtains the distance between the base station and the tag, cooperates with the preset base station coordinates, and uses the simple algorithm designed in this paper to determine the X-axis coordinate of the tag according to the X-direction base station data. So, you can determine the Y and Z axis coordinates, making the positioning algorithm more simple and reliable. Due to the particularity of symmetry, the method can reduce the influence of common interference factors (such as air humidity, temperature, electromagnetic interference, etc.) in the environment, greatly eliminating the common mode error and improving the positioning accuracy.

KEYWORDS

Three-dimensional positioning, Bluetooth, RSSI, Common mode error