In view of the key problems of the infrared system in tracking and acquisition of the highspeed flying projectile target in realtime

a method for solving the dynamic infrared radiation(IR) characteristics of the overall trajectory was proposed. Using 155 mm aperture uncontrolled projectile as the object

the 6degree of freedom (DOF) rigid body ballistic simulation model was established based on Simulink

and the trajectory data were calculated and analyzed. With method by thermal network

a physical model of coupling heat transfer of dynamic IR field was built. The aerodynamic heating calculation model of highspeed rotatable flying projectile was deduced

and the effect of the environmental thermal radiation was considered by Monte-Carlo(M-C) method. The nodes thermal balance equations were solved using RungeKutta method

the distributions of dynamic aerodynamic heating transfer coefficient and temperature and IR fields were obtained

and then the flying projectile IR characteristics in whole fling process on the different positions and wave bands intervals were analyzed. Results showed that the surface temperature increased rapidly when the projectile was launched in a short time. The more closer to the warhead means the faster the temperature rise rate

and the higher the peak temperature. The IR characteristics was obvious before 20 seconds in its flight trajectory. However

with the flight velocity decay resulted in rapid loss of heat

the radiation intensity weakened and mainly focused on 8～14μm wave bands.