Calibration method for radiation signal of LiDAR mapping in 3D ocean space

In order to maintain the continuity and consistency of 3D ocean spatial data and enhance the robustness of mapping radiometric signal correction, the calibration method of LiDAR mapping radiometric signal in 3D ocean space is studied. The environmental impact of the radiation intensity signal is corrected by establishing the radar equation of 3D ocean space LiDAR mapping. By using the method of homonymous points screening based on coherent information, the homonymous laser feet of adjacent navigation belts are automatically screened to determine the overlap area of navigation belts. On the basis of the overlapping zone of the navigation belt and the radar equation, the calibration model of the radiation intensity signal of the LiDAR mapping in 3D ocean space is established. The nonlinear weighted total least squares method is used to solve the correction parameters of the correction model and complete the correction of the radiation intensity signal of the LiDAR mapping in 3D ocean space. The experiment shows that this method can effectively and automatically screen the laser feet of the same name in adjacent navigation belts. This method can effectively correct the radiation intensity signal of 3D ocean space LiDAR mapping. After correction by this method, the laser feet of the same name in the overlapping area of the flight belt basically coincide, that is, the correction effect is better.