具有自动增益调整功能的光斑实时检测技术

针对空间激光通信中精跟踪光斑检测的特点与要求,本文提出使用自动增益调整的方法来克服光强饱和效应.该方法根据空间激光光斑变化原理与特点,采用DSP器件作为核心处理器,完成光斑中位置计算、平滑滤波等功能.实验结果表明本系统不但能够实时输出光斑脱靶量,而且还能够根据不同的输入光功率,自动调整系统增益,从而克服由于光强饱和而造成的光斑检测失效:通过实际测量四象限探测器的转移特性曲线,表明本系统可以实现高精度光斑检测,角度分辨率为10.1 pμrad,经数字滤波后器件细分能力提高1倍.同时该系统可以通过外部配置调整滤波器阶数、正交补偿角等内部参数.

Technology on Real-time Spot Detection with Automatic Gain Function

According to characteristics and demand of fine tracking spot detection in space laser communication system, a kind of real-time spot detection instrument was brought forward by adjusting gain automatically, which can overcome saturation photic intensity effect. Function of calculation center of spot, smoothing filter et al. was implemented by using DSP for spot change. By experiments, miss distance can be exported in real-time, and gain can be adjusted automatically with the change of input powers, which can overcome the failure brought about by saturation photic intensity. Shift characteristic curve of four-quadrant detector is measured, which has been proved that 10.1 μrad of angle resolution has been obtained. Furthermore, the ability of subdivision can be double by digital filtering. The parameters of filter order,orthogonal compensation angle etc. can be set from external configuration.