四象限探测器定位精度的分析与仿真

为了研究影响四象限探测器(QD)在空间激光通信系统中的跟踪精度,以及光斑特性和外部环境对探测器的影响。首先理论推导了四象限探测器光斑检测的原理,然后对光斑半径、光斑位置、背景光、光斑能量分布、死区、系统信噪比等因素进行了仿真分析。研究结果表明,光斑半径的增加会降低四象限探测器的位置探测灵敏度。光斑能量分布、背景光和死区会对光斑位置检测精度产生影响,系统信噪比的提高可以提高位置检测精度。

Analysis and Simulation of Positioning Accuracy of Four-quadrant Detector

In order to study the tracking accuracy of four-quadrant(QD)detectors in space laser communication sys-tems and the effects of spot characteristics and external environment on detectors,at first,the principle of four-quad-rant detector flare detection is deduced through the theory,the effects of facula size,facula centroid position,back-ground light,facula energy distribution,dead-area and the SNR are simulated and analyzed. The results show that the sensitivity of the position detection is reduced with the increase of the facular size. The facula energy distribution,back-ground light and dead-area will have an effect on the detection accuracy of the spot position;and the improvement of the signal-to-noise ratio can improve the position detection accuracy.