可见光CCD探测单色LED信标光功率分析

Analysis of Optical Power of Monochromatic LED Beacon Detected by Visible Light CCD

为解决可见光CCD对空中飞行器远距离高精度跟踪问题，常常需要在飞行器上安装合作信标，以使探测系统能够尽早探测到目标。以辐射度量为标准，从目标信号、背景信号差值与探测器噪声比值的角度出发，分析了探测单色LED信标与可见光CCD最小探测功率、探测到光点所占像素数以及大气透射率之间的关系，计算了在一定作用距离下满足探测要求的不同波长单色LED信标的光功率，并通过观察地面实验中CCD的成像效果，验证了计算结果的正确性。

The cooperating beacons assembled on the aircrafts, can solve the remote high-accuracy tracking problem of the visible light CCD, in order to make the detection system detect the target as soon as possible. Taking radiometry as a standard and embarking on target signal, background signal difference and noise ratio of detector, the relationship between monochrome LED beacons and minimum detection power of visible light CCD, and the relationship between spot size and atmospheric transmissivity are analyzed. Furthermore, the light power of different monochrome LED beacons with fixed operating distance of detector is calculated. And the correctness of the calculation results is validated by observing the effect of ground test of CCD imaging.