Analysis Of Error And Calibration Methods Of Airborne Lidar System

The airborne LIDAR measurement system is an active remote sensing system. It is concentrated expression on rapid development of laser ranging technology, computer technology, high precision dynamic GPS differential positioning technology and high dynamic carrier posture determination technology. It has many characteristics that it has less dependence of control surveying, and is away from impact of the weather, and has a high degree automation, besides it has shorter mapping cycle and so on. It will bring a new technology revolution (Liu Jingnan,2002). Because of the airborne LIDAR measurement system has tremendous advantages in the 3d information acquisition, forest precised measurement, fast response emergency, the city of 3d modeling, European and North American countries have developed in succession a variety of models of airbone Lidar. However, domestic research in this area still lags behind. As a result, it is in urgent need to make breakthrough in core technique and to develop high-accuracy onboard with proprietary intellectual property rights.This paper mainly studies the error and calibration methods of the airborne LIDAR measurement system based on its error generation mechanism, the specific content as follows:1. This paper discuss error source of the airborne LIDAR measurement system in detailed, including range error, angle error, GPS kinematic positioning error, INS posture error and system integration error. It elaborates error models, and analyze the influence of error to laser feet point. Error calibration is necessary based on conclusion.2. For angle and range error of laser scanner, this paper puts forward relatively static calibration method and absolute static calibration method for the calibration respectively, established angle and range error correction model, and verify the feasibility of the two methods through experiments, and gives the accuracy evaluation at last.3. For angle of arrangement existed in airborne lidar system, this paper puts forward the method of resolving angle of arrangement using ground-based control point, and establish the geometric model of solving angle of arrangement according to the least square principle, and verify the feasibility of the method through experiments, and gives the accuracy evaluation at last.