Abstract:The temperature of the optical dome rises rapidly due to aerodynamic heating, and causes severe thermal radiation effects to the missile flying at a high speed. To study how aerodynamic heating influences optical system, a model describing temperature field of dome is built based on CFD fluid simulation software, and a 3-dimentional modeling of the optical system based on software is given. Simulation and calculation are done to learn how the aerodynamic heating influences on detector based on optical software. The simulation result indicates that a rosette scan system is sensitive to the temperature grads of the dome. The interference signal of aerodynamic heating radiation can affect dim and the detection and recognition of small target, with the non-uniformly distributed of the dome. Therefore, the effect from aerodynamic heating cannot be neglected.