Airborne radar power line inspection based on multi-GNSS fusion precise single point positioning

Through the power line inspection experiment of UAV equipped with light detection and ranging (LiDAR) measurement system, this paper proposes an airborne LiDAR power line inspection method based on multi-system precise single-point positioning. The article focuses on the analysis of the three processing strategies of base station differential, single-system precision single point positioning (PPP), and multi-system fusion PPP to generate POS data. The airborne LiDAR data are collected in the north-central part of Jiangsu Province and the results of manually placed control points for verification. The experimental results show that the root mean square error of the POS data obtained by the three methods are all within 0.016 m. Compared with the single-system PPP, the multi-system precision single-point positioning increases by 12% in the elevation direction and 21% in the east (E) direction. The north (N) direction has increased by 17%. The method proposed in this paper has high accuracy in generating three dimensional (3D) point cloud data, and the accuracy of the generated point cloud data meets the requirements of fine power line inspection.