Multisensor information fusion of mobile devices is the basis of the research of mobile location. Odometer and laser point cloud are the main methods to determine the pose in existing positioning techniques. But the initial pose uncertainty, complex iterative process and longer time consuming problems will cause the positioning accuracy greatly reduced, especially after a long distance movement. Therefore, a general odometer-assisted method is proposed for the wheeled mobile platform based on laser point cloud matching. In the approximate motion hypothesis of wheeled mobile platform based on the path curve, rough pose estimation based on the characteristics of the odometer first mobile platform, and this attitude for the initial attitude laser point cloud matching, with the attitude as point cloud matching iteration begins. Experimental results show that the odometer in pose positioning way, effectively reduce the accumulative error of point cloud matching, improves the accuracy of pose determination; also increased the time spent in iteration, improves the work efficiency of the device. In the assumption that the wheeled mobile platform movement path approximates the arc, according to the work characteristic of odometer. Firstly, a rough pose estimate of the mobile platform is presented, and the initial pose of the laser point cloud is taken as the initial value of the matching iteration of the point cloud. Experimental results show that the odometer in pose positioning effectively reduce the accumulative error of point cloud matching and improves the accuracy of pose determination. At the same time, it also reduce the iteration time cost and improve the work efficiency of the device.
As the indoor is a relatively closed and small space, total station, GPS, close-range photogrammetry technology is difficult to achieve fast and accurate indoor three-dimensional space reconstruction task. LIDAR SLAM technology does not rely on the external environment a priori knowledge, only use their own portable lidar, IMU, odometer and other sensors to establish an independent environment map, a good solution to this problem. This paper analyzes the Google Cartographer laser SLAM algorithm from the point cloud matching and closed loop detection. Finally, the algorithm is presented in the 3D visualization tool RViz from the data acquisition and processing to create the environment map, complete the SLAM technology and realize the process of indoor threedimensional space reconstruction
Airborne LiDAR can quickly obtain the high precision three-dimensional information of the target object. It can be used for 3D visualization of power line and measuring distance between power line and ground object. In recent years, it has been widely used in the power industry which is one of the most successful industries for the application laser technology. This paper introduces common post-processing technique of point cloud data in the power line corridor, including the point cloud generation, point cloud filtering and power line classification, power line reconstruction, power line safety distance inspection, power lines 3D visualization. This paper provide reference for application of airborne LiDAR power line inspection technology.