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盖革模式工作的雪崩光电二极管,以其灵敏度高著称,广泛应用于天文观测、粒子物理学、激光雷达以及通信领域.但是由于雪崩光电二极管易受到噪音的影响,特别是在背景光较亮的白天,背景噪音对探测有很大影响.本文针对白天大气背景噪音的情况,建立了盖革模式雪崩光电二极管的探测统计模型,通过设定不同探测器阈值和噪音值进行仿真计算,分析了探测阈值与噪音对虚警率的影响,给出了提高最远探测距离的途经与方法.通过限制滤光片带宽、减小探测器开启时间等方法可以将背景噪音光子数减小到2,在900km处的探测成功率为96.6%.对雷达散射截面为1m2的非合作目标,探测成功率为70%.
Geiger mode avalanche photodiode work, known for its high sensitivity, is widely used in astronomy, particle physics, laser radar and communications.But due to the avalanche photodiode susceptible to noise, especially in the bright backlight In the daytime, the background noise has great influence on the detection.In this paper, the detection statistical model of the Geiger-mode avalanche photodiode is set up for the atmospheric background noise in the daytime. By setting different detector thresholds and noise values for simulation calculation, Threshold and noise on the false alarm rate, and gives the way to improve the farthest detection distance.We can reduce the background noise photon number to 2 by limiting the filter bandwidth, reducing the detector turn-on time, The detection success rate at 900km was 96.6%, and for non-cooperative targets with a radar cross section of 1m2, the detection success rate was 70%.