摘要
从脉冲激光微弱回波信号的统计特性出发,基于单脉冲自相关法和脉冲串互相关法在远程激光测距中的局限性,提出了单脉冲互相关叠加的方法。即先对回波信号进行互相关运算,然后对某一个时间段内已进行互相关运算的回波信号进行多次叠加运算,直到强度满足阈值要求。通过该方法可以有效抑制噪声,提高信噪比,且提取的信号保留了原始信号的基本细节信息,降低了误警率。通过实验,将原不足300m的激光脉冲测程提高至1000m,有效提高了测程。
With the limitation of single-pulsed laser self-correlation and multi-pulse train cross- correlation, a method of single pulse laser correlation and accumulation is presented, based on the statistical features of pulse laser echo signal. Using this method, accumulation of the result of the pulse laser correlation in a certain time, the noise ratio （SNR）, is improved. The false alarm rate of detection is decreased and the details of original signal can be apparently reflected. Through the experiment, the laser ranging of less than 300m is increased to 1000m, which effectively improves the measuring distance.
出处
《北京石油化工学院学报》
2013年第3期18-22,共5页
Journal of Beijing Institute of Petrochemical Technology
关键词
微弱信号
互相关
累积
远程激光测距
faint signal
cross-correlation
accumulation
remote laser ranging
