Abstract
A system for locating the focus surface position of aerial cameras is designed, and the working principle, hardware composition and software design of the system are described. In the system, a collimator is used for producing locating information, and CCD camera is used as a photoelectric converter for receiving the images. The data is processed by center of gravity method, and the converter controls the translation of the camera in axial direction precisely. The focus surface was determined by size of the collected images. Defocusing or not is judged based on the distance between the actual image location and focal plane. Tests to a couple of aerial cameras show that the defocusing judgment result is the same as the flight test result. Therefore, the system can be used to judge whether the aerial camera is defocusing, and thus to judge whether it can work normally or not.
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