The micro-precession effect of reentry missile warhead in terahertz band

Nowadays, the ballistic missile warhead is typical radar target and should be paid attentions for its micro-motions. The midcourse phase of missile warhead is the best phase for target recognition and extraction during the flight. This paper addresses the issue of signature analysis of ballistic missile warhead (Minuteman III) around the reentry point in terahertz band. First, we establish an orbit model of Minuteman III, and the range of azimuth angle of missile warhead is calculated. Then we derived the formula of micro-precession which is the main micro-motion of the missile warhead. Based on it, we simulate the change of micro-Doppler effect follows the varying azimuth angles in both terahertz band and X band. By the simulation studies we confirm the valid of micro-Doppler analysis in terahertz band and also supplies the data for missile warhead extraction in the future works.