脉冲激光测距中阈值—峰值双通道时刻鉴别方法

脉冲激光测距系统由于其精度高、抗干扰能力强等优点，广泛应用于激光雷达、激光引信等领域，但是常用的时刻鉴别法存在误差，制约了动态测距精度的提升，主要原因是回波脉冲的衰减和展宽。针对这一问题，提出一种采用恒阈值和峰值双通道的时刻鉴别新方法。该方法通过引入激光发射脉冲的理论方程，建立了回波波形的时域分布模型，可以实现不受到衰减和展宽的影响的准确回波鉴别。在此基础上设计了双通道时刻鉴别的脉冲激光测距系统。实验结果表明，采用双通道时刻鉴别方法可以将近程测距的误差控制在3 cm以内，并可通过多次测量对精度进一步提升，解决了时刻鉴别误差制约测距精度提高的瓶颈问题。

Threshold-peak dual-channel time discrimination method for pulse laser ranging

Pulsed laser ranging system is widely used in laser radar, laser guidance and other fields due to its advantages of high precision, strong anti-interference ability, etc. However, the commonly used timing discrimination method has errors and restricts the improvement of dynamic ranging accuracy, which was mainly caused by the attenuation and widening of the echo pulse. A new method of timing discrimination was presented in view of this problem, which was based on the dual-channel timing discrimination method. The dual-channel timing discrimination method was composed of constant threshold timing discrimination method and peak timing discrimination method. Through the dual-channel timing discrimination method, accurate echo timing discrimination can be achieved without being affected by attenuation and broadening. By introducing the theoretical equations of the laser emission pulse, the time domain distribution model of the echo waveform was established. The experimental results show that the short ranging error can be controlled within 3 cm by adopting the dual-channel timing discrimination method, and the accuracy can be further improved by multiple measurements, which solves the bottleneck problem that the timing discrimination error restricts the dynamic ranging accuracy.