脉冲激光测距时刻鉴别方法的研究

介绍了一种用于脉冲激光测距技术的双阈值前沿时刻鉴别方法。分析了由接收信号幅度变化引起的计时误差。 采用双阈值前沿时刻鉴别方法产生了飞行时间测量的停止信号和与幅度相关的时间点信号。使用高精度时间测量芯片测量了脉冲信号飞行 时间和信号幅度相关的时间间隔，并对由时刻鉴别器产生的漂移误差进行了修正，获得了误差为$\pm$ 3cm的测距结果。与其它时刻鉴别方 法相比，该方法无需增益控制，其电路结构简单，动态范围宽，而且在脉冲幅度饱和后仍能对漂移误差进行修正。

Study of Timing Discriminator for Pulsed Laser Rangefinder

A dual threshold leading edge timing discrimination method for pulsed laser ranging is presented. The timing error caused by the amplitude variation of the received pulse is analyzed. The dual threshold leading edge timing discrimination method is used to generate a stop signal for flight time measurement and a time point signal related to the pulse amplitude. A high-precision interval measuring chip is used to measure the actual flight time of the laser pulse and the time interval related to the pulse amplitude and is also used to compensate the drift error caused by the timing discriminator. As a result, the ranging precision of $\pm$3cm is obtained. Compared with other timing discrimination methods, this method has the features of no AGC unit, simple circuit structure and wide dynamic range. Moreover, it can still compensate the drift error even when the pulse amplitude is saturated.