Citation: | YAN Jinyun, LIU Hui, ZHAO Weiqiang, et al. Dynamic real-time star map simulation based on convolution surface[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(4): 681-686. doi: 10.13700/j.bh.1001-5965.2018.0425(in Chinese) |
The multi-star simulator dynamically displays star image in the sky map and is the key device for testing a star sensor. As the star spot in the star image smears under dynamic conditions, it is necessary for the star simulator to accurately simulate the smeared star image in real time. First, the convolution surface model of the smeared star spot is established. This model is a convolution of the point spread function and the weight function along the star spot trajectory, and can represent any smeared star spot moving on the image plane. Then, a pixelating algorithm based on the convolution surface is proposed to improve the real-time performance of the star image simulation. The algorithm separates the trajectory into tiny arc segments, calculates pixel values of star spot at each arc segment, and sums all the spots. The pixelating algorithm turns multiple integrals into simple operations, and increases the simulation speed by nearly ten times, with a refresh rate of 30 Hz for multi-star simulator.
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