A high-precision real-time star image simulation method is proposed for the emulational test of a marine star tracker. The computation model for star image simulation is established, and the non-stellar elements simulation method is analyzed. The related algorithms are realized by Visual C++programming. Typical star image simulation examples are presented and compared with the star images generated by Starry Night. The results show that this proposed method can be used to achieve star image simulation for a marine star tracker under various operating conditions. The elements of simulation are complete and correct. The simulation accuracy is comparable to the accuracy of Starry Night at sub-pixel level. And the simulation time for each image is about 24.8 ms. This method meets well the basic requirements of high-precision real-time emulational test of a marine star tracker.% 针对船用星敏感器的仿真测试，提出一种高精度实时星图模拟方法.建立了星图模拟计算模型，并对非恒星要素的模拟方法进行分析.采用Visual C++编程实现相关算法.给出典型星图模拟实例，并与Starry Night软件产生的星图进行比对.结果表明，本文提出的方法能够对船用星敏感器各种运行场景下的星图进行模拟，模拟要素完整、正确，模拟精度与Starry Night接近至亚像素级别，每帧模拟星图生成时间约24.8 ms.能够满足船用星敏感器高精度实时仿真测试要求.
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