Systemic Calibration And Precision Evaluation Of Airbrone LIDAR Measurement System

The airborne LIDAR measurement system (Light Detection And Ranging) is a kind of technology of remote sensing, it is concentrated expression of laser ranging technology, computer technology and high precision dynamic GPS differential positioning technology, and rapid development of 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, so it will bring a new industrial technology revolution. Because of the airborne LIDAR measurement system has tremendous advantages in the 3d information acquisition, forest précised measurement, fast response emergency, the city of 3d modeling, etc, and it also has great advantages for using flexible and low cost. 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.Airborne LIDAR in the process of positioning will suffer from the influences of distance, posture, GPS positioning and so on. These error affect the results of orientation expressing systematic usually, and will affect positioning results in different extent. This paper mainly studies the calibration methods of the airborne laser radar measurement system, and improve the system positioning accuracy. The specific content as follows:1 This paper discuss the background and application status of airborne laser radar measurement system in detail.2 The airborne laser radar measurement system is made up by laser radar ranging system, GPS and IMU. Introduces the principle and performance of components, and explain its orientation principle.3 From the single and integration, analyse the error source of the the airborne laser system from the whole, and set up corresponding model, improving its precision through the error correction. 4 Explore the calibration method of GPS, INS and LIDAR, quantitatively measuring GPS kinematic positioning error, INS posture error and Lidar Angle and measurement error. And determined the position between the integrated sensors, calculate the orientation and position parameters using calibration area. And correct the laser feet point according to this parameters, finally evaluate the airborne laser radar measurement system positioning accuracy through fight.