Abstract
Abstract. The final output signal quality of TDICCD is related to the key parameters such as working mode, output mode, signal-to-noise ratio, dynamic range and so on. We can improve these parameters of TDICCD by reasonably designing the sensor clocking. Therefore, this text discussed four methods of improved TDICCD sensor clocking to solve some problem in TDICCD application based on using the principle of TDICCD. The technique of TDICCD Taps merging can reduce the number of TDICCD Taps, which helps to reduce the size of the TDICCD rear-end circuit significantly; The technique of TDICCD continuous transfer clocking can improve the charge transfer efficiency, which helps to promote the final signal-to-noise ratio; The technique of pixel binning clocking can enlarge the dynamic range of image; The technique of TDICCD area-array working mode can extend the field of TDICCD working; The principle, derivation process, clocking sequence diagram and application range of these clocking design schemes are given in this paper. At the same time, it also explains its actual effect and the matters to be noted.
Highlights
The high-precision long-line array time-delay integral chargecoupled device (TDICCD) is used for the satellite multispectral remote sensing camera
Because TDICCD is the initial source of remote sensing image data, the quality of its output signal plays a vital role in the whole imaging system
Spacecraft Recovery&Remote Sensing, 2015, 36(1), pp.49-51. It introduces TDICCD structure and sensor clocking principle, and discusses four methods of TDICCD clocking, which combined with the problems in the practical application of TDICCD camera
Summary
The high-precision long-line array time-delay integral chargecoupled device (TDICCD) is used for the satellite multispectral remote sensing camera. Based on multiple exposures to the same target, the photosensitive charge packet is integrated by delay to enhance the collection of light energy It can solve the contradiction between sensitivity and speed and resolution. In the process of scanning image along the direction of the TDICCD column, in the first integration period, the ball carries on the exposure integration in the first pixel of a column, and the photosensitive charge is not read out like the ordinary CCD, and it moves down one pixel. The theory of TDICCD is that the vertical CCD registers are clocked to ensure that the charge packets are transferred at the same rate and in the same direction as the image. It has the further advantage of averaging out any nonuniformities in each vertical column and gives an enhanced signal to noise ratio
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