基于光路复用机理的激光近程动态测距概率分布

Probability Distribution of Laser Short-Range Dynamic Ranging Based on Optical Multiplexing Mechanism

基于光路复用机理,提出了一种激光近程动态扫描探测方法。基于重尾函数建立了一种脉冲激光发射波形数学模型,推导了脉冲激光近程动态探测冲击响应及回波方程。建立了一种脉冲激光测距概率统计分布模型,研究了脉冲激光发射功率/脉宽、阈值检测电压、等效均方根噪声电压以及激光出射角对测距概率分布的影响机理。结果表明:随着发射功率的增加,测距精度提高且分布曲线逐渐偏离真实值;测距精度随着激光发射脉宽的增加而递减;随着阈值电压的提高,分布曲线向右移动;距离测量分布曲线随着等效均方根噪声电压的增加而宽度增加、幅值减小;随着激光出射角度的增加,测距分布曲线向右移动,测距精度随之降低。

A laser short-range dynamic scan detection method is proposed based on the optical-multiplexing mechanism. Based on the heavy-tail function, a mathematical model of pulsed laser emission waveforms is established, and the shock responses and the echo equation in the pulsed laser short-range dynamic detection are deduced. A statistical probability distribution model of the pulsed laser ranging is established, and the influence mechanisms of the pulsed laser emission power, pulse width, threshold detection voltage, equivalent root-mean- square （RMS） noise voltage, and the laser exit angle on the probability distribution of the ranging are studied. The results show that, the ranging precision increases and the distribution curve gradually deviates from its true value with the increase of the laser emission power. The ranging precision decreases progressively as the laser emission pulse width increases. As the threshold voltage increases, the distribution curve shifts to the right. As for the distance measurement distribution curve, its width increases and its amplitude decreases with the increase of the equivalent RMS noise voltage. The ranging distribution curve shifts to the right and the ranging precision decreases as the laser exit angle increases.