The techniques of channel separation, range gate, variable gain of photomultiplier tube and cross polarization are analyzed and combined to improve the dynamic range compression of the laser echo signal in airborne laser bathymetry. 分析了分通道、距离选通、光电倍增管变增益、正交偏振等多种技术相结合的方法,用以改善机载激光测深系统中激光回波的动态范围。