During astronomical observations, the CCD sensor will produce the smear effect during frame transfer, and the smear effect will pollute the column pixels corresponding to the image, thus affecting target detection. According to the characteristics of frame transfer CCD, the generation of smear effect is analyzed, and the gray scale analysis model of the smear effect is established, which simulates the gray value corresponding to the smear effect generated by astronomical observation cameras when detecting targets of different magnitudes and verifies it through experiments. The theoretical analysis in this paper provides an important reference for the design of astronomical cameras.
KEYWORDS: Interference (communication), Charge-coupled devices, Denoising, Electrons, Cadmium sulfide, Analog to digital converters, Analog electronics, Tunable filters, Signal processing, Linear filtering
As a new low noise CCD signal processing technology, digital correlation double sampling noise reduction technology is widely used in the field of faint astronomical target detection. In this paper, various noise sources of CCD video processing circuit are studied, the characteristics of various noises are analyzed deeply, the mathematical model of CCD circuit noise is established, and a noise reduction method based on digital correlation double sampling technology is proposed. Through simulation modeling of CCD noise signal, the simulation results show that the digital correlation double sampling method using double Gaussian filter function has a good effect on noise suppression.
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