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机载激光雷达多采用单束激光,通过扫描的方式完成对目标的探测。通常,由于扫描机构的缺陷,激光脚印在地面上的分布是不均匀的,而均匀扫描方式可提高激光雷达图像反演的质量,但在实现上存在一定的难度。首先从理论上分析了实现均匀扫描应满足的关系式,进而给出了一种工程实现的方法。电机输入曲线以理论推导的关系式为基础,在扫描视场边缘,通过曲线拟合,对理论曲线进行平滑,降低扫描输入曲线中的高次谐波分量。在测得振镜幅频特性曲线的基础上,利用迭代算法得出曲线拟合过程中的参数。与其他方法相比,该方法可以根据给定的扫描频率和视场角,自动计算出最佳电机输入曲线,从而在工程应用中,能够灵活地改变扫描参数。模拟实验结果表明,应用该方法扫描,激光点分布均匀,线性度良好。
Airborne laser radar to use more than a single laser, scanning the way to complete the target detection. Usually, due to the defects of scanning mechanism, the distribution of laser footprints on the ground is not uniform, and the uniform scanning method can improve the quality of laser radar image inversion, but there are some difficulties in its implementation. First of all, theoretically analyzed the relationship between the realization of uniform scanning should be satisfied, and then gives a method of engineering. The motor input curve is based on the theoretically derived relation. At the edge of the scanning field, the theoretical curve is smoothed by curve fitting to reduce the higher harmonic components of the scanning input curve. On the basis of measuring the amplitude-frequency characteristic curve of the vibrating mirror, the parameters in the curve fitting process are obtained by using the iterative algorithm. Compared with other methods, this method can automatically calculate the optimal motor input curve according to the given scanning frequency and angle of view, so that the scanning parameters can be flexibly changed in engineering applications. Simulation results show that the method of scanning, the laser spot evenly distributed, good linearity.