Aiming at the current status that the on-orbit imaging accuracy is low and the application-oriented imaging system is not perfect, the detailed simulation of entire space-based imaging chains of space object is carried out in this paper. Firstly, the influence factors on entire space-based imaging chains of space object are analyzed, including the physical parameters of the object, the performance parameters of the detector, and the orbit parameters of the sun, object and detector. Then, a model for entire space-based imaging chains of space object is built. The model consists of radiation transmission based on the bidirectional reflectance distribution function (BRDF) and image degradation based on the modulation transfer function (MTF). Finally, the grayscale images of the International Space Station (ISS) are simulated. It shows the blurring effect caused by each link of entire chains can be truly, accurately and completely reflected.
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