High-precision laser spot center positioning method for weak light conditions

In the acquisition stage of many space applications, such as the Taiji program, the spot center of weak laser light must be accurately determined. Underweak light conditions, the precision of most traditional positioning methods is greatly affected. In this paper, we present a high-precision laser spot center positioning method based on the theoretical analysis of influence factors of precision. It is shown through experimental study that the method's precision can fulfill the requirement of the Taiji program. (C) 2020 Optical Society of America