机载LiDAR安置角误差影响分析及检校方法

Error analysis and calibration methods of boresight misalignment in airborne Li DAR measurement system

机载激光雷达测量系统受到多种误差源的影响,其系统由GPS接收机、激光测量单元系统(IMU)、激光测距仪等组合而成,所以可以将误差来源分为单机误差和集成误差两部分。本文主要对集成误差中影响较大的安置角误差作了分析,定性和定量地分析了安置角误差对激光脚点坐标的影响。同时,描述了一种安置角检校方法,并用算例详述了检校场选取与航线设计以及安置角检校步骤,对其作了精度评定,分析了误差原因。

The airborne laser radar measurement system,which is composed of GPS receiver,laser measurement unit system( IMU) and laser range finder,is affected by a variety oferrors. The error sources can be divided into two parts,single error and integrated error. Boresight misalignment has a greater impact on the integrated error. This paper mainly analyzes the influence of boresight misalignment error and how it affects laser feet point coordinate with both qualitative and quantitative analysis. At the same time,a method of boresight misalignment calibration is described. An example is given to show details on selection of control field,route design and calibration steps,and accuracy assessment of the example has been taken and the source of errors has been discussed.