非共轴激光雷达的几何重叠因子对系统性能具有重要的影响,其直接决定激光雷达探测中消光系数反演的精度。 文中提出了系统装配完成后标定激光雷达几何重叠因子的方法。首先,利用最小二乘法以及二次曲线拟合,得到一种确 定Klett反演算法中参考高度的方法;其次,通过拟合还原近场回波信号,并利用雷达原始回波信号与拟合信号之比,得到 系统的几何重叠因子;然后,再利用所得几何重叠因子对近场回波进行修正并作全程范围信号的拟合,确定消光系数边界 值,以此作为Klett算法的参考高度;最后,利用2012年初春激光雷达资料对大气消光系数进行反演计算,证明该标定方法 简单可行,能对激光雷达进行室内标定、降低对系统参数的要求,理论计算误差小。

Non coaxial laser radar geometric form factor has important influence to extinction coefficient inversion accuracy in laser radar detection. A method of the calibration laser radar geometric overlap factor was put forward after completing the system assembly. By use of least squares method and quadratic curve fitting, a sure Klett inversion algorithm reference height method is got. The near field echo signal is restored with the fitting way, and the system of geometric form factor is got by employing the ratio of the original radar echo signal to the signal of fitting. The near field echo was amended and full range of signal was fitted by reusing the geometrical form factor, the extinction coefficient boundary value was determined. The value was taken as klett algorithm reference height. By the lidar data gained in early spring of 2012, the atmosphere extinction coefficient was inverted. The results show that the method is feasible, laser radar indoor calibration may be operated, the requirement for the system parameters is not strictly, and the theoretical calculation error is smaller.

江苏省科技支撑计划;气象行业专项