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小型化的高重频多脉冲激光测距机采用数字化处理确定目标距离,接收电路带宽、数字化采样精度以及滤波算法等因素会影响测距的精度,文中在对测距误差分析的基础上提出改进测距精度的算法。首先,在对激光回波信号积累以提高信噪比的基础上,对回波信号波形进行中心差分处理、斜率阈值和幅度阈值条件处理,剔除伪峰值点,初步确定峰值点位置。然后,根据初定位后的波形特点,选择相应的指数函数进行非对称sinc函数波形拟合修正,估计波峰点相对准确位置,从而输出较为精确的目标距离。最后,将改进算法在matlab中仿真,实验结果验证了文中提出的修正算法对提高激光测距精度的有效性。
The miniaturized high repetition frequency and multi-pulse laser range finder uses digital processing to determine the target distance, the receiving circuit bandwidth, the digital sampling precision and the filtering algorithm and other factors will affect the accuracy of ranging. Based on the analysis of ranging error, Ranging accuracy of the algorithm. First of all, based on the accumulation of laser echo signal to improve the signal-to-noise ratio, the echo signal waveform is processed by center difference, slope threshold and amplitude threshold condition, the pseudo peak point is removed and the peak point position is determined preliminarily. Then, according to the characteristics of the waveform after the initial positioning, the corresponding exponential function is selected to correct the asymmetric sinc function waveform fitting, and the relative position of the peak point is estimated to output the more accurate target distance. Finally, the improved algorithm in Matlab simulation, the experimental results verify the proposed correction algorithm to improve the accuracy of laser ranging accuracy.