The Same Track, Pieces Of Two-speed Imaging Ccd Camera Analog Circuits And Systems

At present, the imaging systems with scientific CCD for Astronomical observation usually operate in either stare mode or drift scan mode (that is also called time delay and integration, TDI). Even for a system integrated with the two modes, it can not operate in the two modes at the same time; instead it can only work in one mode selected by the user via a software switch. A system or camera operated in the stare mode can take pictures of the relatively still objects in the field of view of a telescope, and the one in drift scan mode can be used to solve the tracking imaging problem for the moving objects. But when there are both the still objects and the moving objects in the field of view, neither of them can get the satisfying images of the still and moving objects independently at the same time. One of their images will be inevitably lengthened. And distortion of the images will lead to the descent of accuracy of differential measurement of positions of moving objects in space (such as satellites, debris and asteroids) with respect to the stars. To solve the problem, we have studied and developed a novel CCD imaging principle, accomplished technology and a corresponding observation technique, named as Dual-Speed Tracking Imaging on Same Frame (DSTIS) in our Electronics & Information Technology Lab for Astronomy, Kunming University of Science and Technology.Making use of this new imaging principle and accomplished technology, we have designed analog circuits of a prototype camera (DSTIS camera). In this paper we discuss some specific requirements of the DSTIS camera first, simply introduce photosensitive component CCD which we have chosen, and analyses its imaging principle in brief, and then present a detailed description of the design philosophy of the analog system of this camera, the architectures and the design courses of some major modules of circuitry. Some key modules are simulated and tested. The simulation and testing results are comparatively analyzed so as to test the rationality and feasibility of our design.