To improve the tracking performance of an orbital target-tracking system, this paper researches the limited magnitude calculation method and photoelectric detection performance in a photoelectric tracking system, and deduces and sets up the calculation model of the limited magnitude of the orbital photoelectric tracking system based on the characteristics of target luminance, background luminance, and CCD noise; it analyzes key factors that affect its photoelectric detection performance; discusses the relation of the limited detectable magnitude of the photoelectric detection system with the exposure time of the CCD, the threshold of the signal-to-noise ratio, and the dark current of the photoelectric detection system; and gives the calculation function and the change curve of corresponding function parameters. Through a synchronous tracking experiment, the detection performance and limited magnitude calculation function of the target photoelectric tracking system were verified, and the results show that within a certain illumination, the longer the exposure time of the CCD, the smaller the dark current of the photoelectric detection system. The test data are in accordance with the theoretical calculation data. (C) 2015 Optical Society of America
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