Dynamic Characteristics and Stability of an Infrared Search and Track

Choi, Jong-Ho; Park, Yong-Chan; Lee, Joo-Hyoung; Choi, Young-Soo

Journal of the Korea Institute of Military Science and Technology 2008;11(2):116-124.

Jong-Ho Choi, Yong-Chan Park, Joo-Hyoung Lee, Young-Soo Choi

적외선 탐색 및 추적장비의 동적 특성 및 안정화

최종호, 박용찬, 이주형, 최영수

국방과학연구소

Abstract

Current paper investigates the dynamic behavior and stability of an infrared search and track subjected to external disturbance having gimbal structure with three rotating axes keeping constant angular velocity in the azimuth direction. Euler-Lagrange equation is applied to derive the coupled nonlinear dynamic equation of motion of infrared search and track and the characteristics of dynamic coupling are investigated. Two equilibrium points with small variations from the nonlinear coupling system are derived and the specific condition from which a coupled equation can be three independent equations is derived. Finally, to examine the stability of system, Lyapunov direct method was used and system stability and stability boundaries are investigated.

Key Words: Infrared Search and Track, Dynamic Motion, Stability, Lyapunov