Research and Implementation of Mono-Anchor AOA Positioning System Based on UWB

Abstract

AbstractIn order to satisfy the high-precision positioning of small indoor occasions, a unipole directional rectangular array antenna and DW1000 chip is used in Angle of Arrival (AOA) system, and this paper presents a Mono-Anchor AOA 3D positioning system based on ultra-wideband (UWB). We first analyze the principle of the azimuth and elevation angle obtained by the rectangular 2D 4-element array antenna. And then combining the estimated AOA with TOF ranging method, the Mono-Anchor 3D spatial positioning scheme is proposed in this paper. With high angular resolution and sensitivity, to a certain extent, this scheme avoids the problems of multi-anchor deployment difficulty and insufficient positioning accuracy. In this paper, we estimate experimentally, for the first time, the accuracy of indoor positioning system based on AOA mechanism adopted by the UWB standard. The experimental results in the indoor environment show that after the phase delay calibration, we can effectively measure the AOA of the tag in the range of [−80°, 80°] when the test interval of the anchor is 1–5 m; Within the grid area of 4 × 8 m, the 2D average positioning accuracy of the AOA system can reach about 15 cm. At the same time, the AOA system also can effectively calculate the height of the tag, so as to obtain the 3D coordinates of the tag. Based on this, the Mono-Anchor AOA indoor positioning system proposed in this paper is a low-cost accurate indoor positioning solution.KeywordsUWBAOAMono-Anchor3D positioningArray antenna