摘要
光子探测具有灵敏度高、系统功耗低和探测距离远等优点,探测性能易受大气环境影响。建立湍流效应下光子探测模型,定义了回波光子调制泊松分布概率,当回波光子数小于0.1时,调制泊松分布退化为泊松分布。建立了光子探测距离漂移模型,重构光子探测的回波分布,以计算距离漂移。探讨了湍流效应下的光子探测回波特性和距离漂移的变化规律。结果表明:湍流作用下光子探测首光子效应减弱,当湍流为10-16m-2/3,无湍流的回波光子数为2时,与无大气湍流时相比,距离漂移减小0.41 cm,测距精度下降0.23 cm;随着湍流的增强,湍流为5×10-15m-2/3时,探测概率平均降低78.18%,距离漂移平均减小91.49%,测距精度最大下降85.77%。
Photon detection has the advantages of high sensitivity,low system power consumption and long detection distance.And its performance is easily affected by the atmospheric environment.A photon detection model affected by the turbulence was established,and the modulated Poisson distribution of the echo photon was defined.The modulated Poisson distribution degenerated into Poisson distribution when the number of echo photons was less than 0.1.The range walk error model of photon detection was established to reconstruct the echo and calculate the range walk error of photon detection.The characteristics of photon detection echo and range walk error affected by turbulence were discussed.The results show that under the influence of turbulence,the first photon effect of photon detection is weakened;when the turbulence is 10-16m-2/3 and the number of echo photons is 2,the range walk error of photon detection is reduced by 0.41 cm and the range precision decreased by 0.23 cm,compared with when there is no atmospheric turbulence.When the turbulence is 5×10-15m-2/3,the detection probability of photon detection is reduced by 78.18%on average,the range walk error decreases by an average of91.49%,and the range precision drops by a maximum of 85.77%.
作者
侯阿慧
胡以华(指导)
赵楠翔
董骁
曾祥熙
Hou Ahui;Hu Yihua;Zhao Nanxiang;Dong Xiao;Zeng Xiangxi(State Key Laboratory of Pulsed Power Laser(National University of Defense Technology),Hefei 230037,China;Key Laboratory of Electronic Restriction,Hefei 230037,China;N0.63850 Unit of PLA,Baicheng 137000,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第S02期197-203,共7页
Infrared and Laser Engineering
基金
国家自然科学基金(61871389)
国防科技大学科研计划(ZK18-01-02)
关键词
距离漂移误差
大气湍流
光子探测
探测概率
泊松分布
range walk error
atmospheric turbulence
photon detection
detection probability
Poisson distribution
