多脉冲互相关检测法在远距离脉冲激光测距中的应用

Multiple Pulse Cross-correlation Method in Remote Pulse Laser Ranging

针对远距离脉冲激光测距中微弱信号的提取,提出了一种多脉冲互相关的叠加方法,即对某时间段内的脉冲回波信号进行互相关叠加,利用噪声的不相关性,达到增加信号的强度,以提高信噪比,降低误警率。通过对不同距离的测量目标进行回波信号提取试验证明,多脉冲互相关累积法可以将原来不足300m的探测距离提高到1 000m以上,大大提高了脉冲激光的测程。

In view of the weak signal extraction in pulse laser ranging over a long distance, a multiple pulse superposition of cross-correlation method has been proposed. A certain period of time pulse echo signal is in cross-correlation function, using the irrelevance of noise to increase the intensity of the signal, improve the signal-to-noise ratio and reduce the false alarm rate. Through the different distance measuring target echo signal extraction experiments, muluple pulse cross-correlation accumulation method can increase the detection range of the original less than 300 meters to 1 000 meters, greatly improving the measurement of the pulse laser.