脉冲展宽特性是激光回波的重要特性，其影响到回波接收信噪比和测距精度。
As an important feature, the characteristics of echo stretching affects SNR of received laser echo signal and ranging accuracy.
根据三脉冲激光雷达回波信号的特点，对信号进行差分滤波和匹配滤波处理，信噪比提高约1.5倍；
According to laser radar echo characteristic, the difference filter and the match filter were adopted. As a result, the SNR is advanced about 1.5 times.
为解决低信噪比下激光微弱回波的检测问题，提出了一种新的小目标检测算法。
To solve the laser weak echo detection under the clutter background, A dynamic programming(DP) technique has been developed for the detection of weak targets.
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