中国激光, 2013, 40 (7): 0714004, 网络出版: 2013-06-25
条纹管成像激光雷达距离分辨率
Range Resolution of a Streak Tube Imaging Lidar System
成像系统 条纹管 激光雷达 距离分辨率 Cramer-Rao下限 imaging systems streak tube lidar range resolution Cramer-Rao low bound
摘要
通过参数估计方法对条纹管成像激光雷达的距离分辨率进行了研究,利用数理统计理论分析了距离分辨率的Cramer-Rao下限(CRLB,fCRLB)。研究了条纹管激光雷达回波信号统计模型,推导出了条纹管成像激光雷达距离分辨率的fCRLB计算公式,分析了fCRLB随距离间隔的变化关系,利用fCRLB对条纹管激光雷达的距离分辨率的影响因素进行了研究。结果表明,距离分辨率的fCRLB随着目标距离间隔的增加而减小,提高回波信号的信噪比和条纹管的扫描速度都可以减小距离间隔估计方差的fCRLB,从而提高成像系统距离分辨率;针对特定的条纹管扫描速度,存在最佳激光脉冲发射宽度,使得系统距离分辨率达到最高。
Abstract
The range resolution of a streak tube imaging lidar (STIL) system is researched based on the parameter estimation theory. According to the theory of mathematics statistics, the Cramer-Rao low bound (CRLB) of range resolution estimate variance is analyzed. Streak tube lidar pulse model is researched, and the formulas of CRLB are given. The influences of range resolution of the STIL system are analyzed. The results show that higher signal-to-noise ratio values and faster streak tube sweep rate are both helpful in range separation estimation efforts. In addition, there is an optimal pulse-width that produces an optimal range resolution for a particular streak tube sweep rate.
赵文, 韩绍坤. 条纹管成像激光雷达距离分辨率[J]. 中国激光, 2013, 40(7): 0714004. Zhao Wen, Han Shaokun. Range Resolution of a Streak Tube Imaging Lidar System[J]. Chinese Journal of Lasers, 2013, 40(7): 0714004.