Analysis and determination of lidar geometrical factor
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摘要: 为了实现激光雷达对近场的测量,必须获得激光雷达系统几何因子。采用理论分析计算和实验测量两个步骤确定了几何因子性质及廓线。首先,通过分析平行轴和共轴激光雷达接收、发射系统的结构,引入了可完全聚焦填充系数,从几何光学角度推导了两种填充系数的表达式,从而界定了几何因子值的理论范围。其次,介绍了采用对远场回波信号拟合的方法反演近场信号,从而获得几何因子廓线。以中科院AML-2共轴激光雷达为例,采用该方法测量了几何因子廓线,结果验证了对几何因子的理论分析。Abstract: To employ lidar for short distance detecting,the geometrical factor must be previously know.Theoretical analysis and experimental study are applied for determination of lidar geometrical factor.Firstly,the geometrical factors are analyzed for lidar with biaxial or coaxial transmitter-receiver.A full focusing filling factor is introduced.Equations of two kinds of filling factors related to geometrical factor are deduced based on geometrical optics.The theoretical range of geometrical factor's value is reached based on these equations.Secondly,a method is introduced for determination of geometrical factor by fitting lidar's back signal of far distance for inversing the signal of short distance.As an example,the geometrical factor profile of AML-2 lidar made in Chinese Academy of Science is determined experimentally with this method.The experimental results are accordant with the theoretical analysis.
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Keywords:
- laser technique /
- lidar /
- geometrical factor /
- filling factor /
- extinction coefficient
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