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.