摘要
激光脉冲测距中,微弱回波信号的检测处理一直是一个难题。随着测距指标的提高,直接提取回波转换电平的方法已无法满足测距精度和测程的要求。本文针对激光回波信号信噪比较低时,如信号的脉宽较窄、幅值较小时,利用高速AD采样技术,结合FPGA的高速信号处理能力,设计了一套回波检测处理系统,以期提高对回波信号的拾取精度和较为精确的计算主波与回波之间的时间差。在最终的实验系统中,实现了高达1GHz的采样率以及与之匹配的信号处理速率,并将采样率高达1GHz的高速采集系统应用到脉冲激光测距系统中,得到了良好的实验结果。
In laser ranging, the very weak echo wave detecting is very important and difficult. In order to improve the aim distance and measuring accuracy, the classic method by using the analog electronic technology completely can’t fit for some application any more. Then, a digital high speed data capture system to detect the echo wave was designed which adopted high speed AD unit and FPGA circuit as core devices. At last, the realized system reached 1GHz sampling rate and experimental results showed that it could measure a longer effective aim distance and improve the measuring accuracy highly.
出处
《光电工程》
CAS
CSCD
北大核心
2011年第5期59-63,126,共6页
Opto-Electronic Engineering
基金
863高技术项目
