机载激光扫描测距接收机中信号处理研究

A Study on the Signal Processingin an Airborne Laser Scanning Range find Receiver

本文分析了普通脉冲激光测距接收机的原理，并指出了它运用在机载激光扫描测距时存在的问题。针对激光束扫描时倾角变化带来的回波脉冲幅度和宽度的变化，提出运用滤波器带宽自动控制技术来改善输出信噪比，运用自动修正恒比定时触发技术提高测距精度。实验结果证实，改善效果是明显的。

The Fundamentals of a general pulsed laser rangefind receiver are analyzed andthe disadvantage is pointed out if it is used as an airborne laser scanning rangefinder.As the amplitude and the width of the return pulse vary with the scannihg angle of alaser beam, it is put forward that the technique for automatically controlling the bandwidth of an filter can be used to raise the output signal-nosie ratio and that the techniquefor automatically amending constant time trigger can be applied to improve the rangingprecision.It is proved that these methods have obvious effect on rangefind.