飞行器制导精度评估 ,特别是航天器的姿态与定点控制、落点预报等 ,都离不开高精度的外弹道测量数据。在影响测量数据精度因素中 ,折射误差是主要误差源之一。目前折射误差修正方法中 ,一类精度很高 ,但计算速度太慢 ,无法应用于实时计算 ;一类速度很快 ,但因为使用的是简化模型 ,因而精度较差 ,难以满足未来高精度测控的需要。如何在确保实时计算速度基础上 ,又能提高其处理精度 ,正是文章构造出的快速折射修正二步方法所解决的课题。经仿真计算证明 ,该方法的结果完全满足实际工程对精度和速度的要求 Aircraft guidance accuracy assessment, especially spacecraft attitude and fixed-point control, placement prediction, are inseparable from the high-precision external ballistics measurement data. Among the factors that affect the accuracy of the measurement data, refractive error is one of the main sources of error. Currently, one of the methods for correcting refractive error has a high accuracy, but its calculation speed is too slow to be applied to real-time calculation. One type is fast, but its accuracy is poor because of using a simplified model, so that it is difficult to meet future high-precision measurement and control Need. How to improve the processing accuracy on the basis of ensuring real-time computing speed is exactly the problem solved by the two-step method of fast refraction correction constructed by the article. The simulation results show that the result of this method completely meets the requirements of precision and speed of practical engineering