Research Of Space Object Detecting Under Bright Background

According to statistical research, about third quarters of space targets distribute in the middle and low earth orbits between 200km and 1500km. For the shelter effect of the earth, the satellites, especially those in the low orbits, are only detected at dawn or dusk ,and in daytime, when they are illuminated by the sun.As a result, it is of important meaning for the national defence and millitary affairs to detect these targets in daytime.For detecting celestial bodies in daytime, two sticking points are involved: how to suppress the strong backgroud signal and how to improve detect capabilities of the system. The thesis makes a further study on the two key technologes. At first, It processes theoretical analyses about the detecte machanism, and then analyses in detail the limit detect theory of optic-electricity system with plane array CCD, final gains the limit detecting formula.The thesis studies the experiments and researchs about the detect technology in daytime and get the results that the theory corresponded with experiment by using the detect SNR to estimate the limit detect star magmatitude of the system. Intergrated with the experiment datas, quantitative analysis is made about some key technologies for the detecte capabilities in daytime, as the selection of CCD camera and bands of spectrum filter, image processing and low velocity reposefully tracking technology .For the low velocity dithering in optic-electricity servo system, targets' lucos forecasting and velocity surveying feedback filter technology is involved. With the simulation and experiments, the new meaning is proved useful and can improve the low velocity tracking, minish the dispersion of the target energy.and target detecting SNR.Additional.in the experinents, the digital CCD cemara with high sensitivity.high defference and small dark current can get SNR stabilization and it can achieve 1,which breaks through the SNR...