Influence and Analysis of IMU Attitude Measurement Error on Laser Point Accuracy

The emergence of airborne LIDAR system provides a new technical method for fast acquisition and processing of the spatial three-dimensional data. The limitations of traditional techniques are overcome by LIDRA, using of non-contact scanning data to obtain high-precision 3D data, it be able to work in all-weather, with a quickly scanning speed, strong real-time, all-digital processing and so on. The coordinates of laser pin-point can be abtained by calculating the spatial orientation vector of known points to the unknown point in LIDRA system. The composition of systems is very complex, so the laser point coordinates location will effected by system error and accidental error of the LIADR system. The status quo of airborne laser scanning was briefly introduced in this paper. On the basis of airborne laser scanning system positioning principle, the impact of the pitch angle, roll angle, yaw angle and synthetic attitude error of IMU on laser point positioning accuracy was detailedly analyzed. After simulated calculations using IMU practical measurement accuracy presently, some useful conclusions were obtained, which have certain guiding significance for the understanding of airborne laser positioning accuracy and practical application.