机载LiDAR安置角检校定标器设计与验证

Design and Validation of Calibration Target for Calibration of Airborne LiDAR Boresight Angles

传统的检校安置角误差的方法依靠人工量测重叠航带同名特征间的偏移来估计安置角误差,但是同名特征的真实位置难以获取,并且人眼瞄准误差的存在降低了检校精度。因此设计了一种定标器来解决同名特征的获取难题。首先介绍了定标器的结构特点和设计原理,然后制作了缩放模型并进行了半仿真地面扫描实验,分析了定标器的可用性。最后制作了实物进行飞行实验进一步证明其设计的合理性。研究结果表明定标器的设计是合理的。

Conventional calibration method of boresight angles is depending on manual procedures of measuring the overall strip homologous feature discrepancy to determine the boresight angles.The accurate positions of the homologous features in overall strips are unrealistic to locate.In addition,the existence of eye collimation error also reduces the calibration accuracy,thus it requires a great mount of iterative computation to approach the ideal values of the boresight angles.Thus a target of assisting calibrating the boresight angles was designed to solve the problem of obtaining homologous features.A description of its design principle and structure was present firstly.Then several scale models were fabricated for the semi-simulation ground scanning test to analyse the usability of the calibration target preliminary.Finally,two prototype size calibration targets were fabricated for the aircraft flight test to demonstrate the usability in advance.The research results show that the design of the calibration target is rational.