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在航天员训练用的飞行程序训练模拟器视景仿真中,为了获得较好的视景图像效果,往往需要使用GPU进行视景仿真计算,然而载人飞行器在轨飞行时,飞行器相对地球惯性坐标系位置数据值大,已超出单精度GPU有效表达范围,导致视景图像抖动。详细分析视景图像抖动产生的原因,给出消除图像抖动的仿真方法,并提出评估图像抖动大小的计算方法。最后,以计算用例对比该计算方法与观察实际仿真图像效果,证实了该计算方法的有效性。该计算用例同时验证了消除图像抖动仿真方法的合理性和有效性。
Astronaut training flight program training simulator scene simulation, in order to obtain a better visual effects, often need to use the GPU for visual simulation, but the manned aircraft in orbit flight, the aircraft relative to the Earth’s inertial coordinates Department of the location of the data value is large, has exceeded the single-precision GPU effective expression range, resulting in jitter scene. This paper analyzes in detail the cause of the image jitter and gives the simulation method to eliminate the image jitter and proposes the method to calculate the image jitter. Finally, comparing the calculation method with the actual simulated image by using the calculation example, the validity of the calculation method is proved. The computational use case also verifies the rationality and validity of the method to eliminate image jitter.