以激光雷达回波信号的频谱特征为基础，提出了用信号延时叠加来提高激光雷达探测信噪比的方法.通过实验测量获取了大量激光雷达回波信号，并以此为基础，讨论了信号延时叠加提高激光雷达探测信噪比的可行性.结果表明：在系统带宽50 MHz、回波脉宽30 ns的条件下，通过信号延时叠加可提高激光雷达的探测信噪比在40%以上，且存在最佳的延时时间.

A new method of by time-delay superimposition was developed which could effectively improve the detecting signal-noise-rate of laser radar on the basis of spectral characteristic analysis.A larger number of laser radar echo signal was obtain by experiment.And the practicability of using time-delay superimposition to improve the detecting signal-noise-rate of laser radar was discussed on the basis of it.The results show that on the condition of 50 MHz system bandwidth and 30 ns impulse width of echo wave,time-delay superimposition could improve the detecting SNR of Laser radar more than 40%.Also the optimally time also was existence.