研究红外光线经过高速流场时由于折射产生的瞄视误差(BSE)，对于红外末制导拦截弹的命中精度有重要意义。考虑高温真实气体效应，求解热化学非平衡Navier-Stokes (N-S)方程得到导引头的流场，采用光线追迹的方法，对红外光线经过流场后到达导引头光学窗口的瞄视误差进行了计算分析，研究了光线入射角、飞行马赫数、攻角、高度及红外导引头外形对瞄视误差的影响。

Study on the bore-sight error (BSE) induced by high-speed flow-field is important for the hit precision of a hit-to-kill interceptor with infrared ray (IR) terminal homing system. Based on the flow-field by solving the thermal-chemistry non-equilibrium Navier-Stokes (N-S) equation, the ray-tracing method is used to calculate the BSE of ray transmission through the flow field outside the optical window. The impact factors of BSE are considered, including incidence angle, Mach number, attack angle, altitude and the IR seeker shape.