关键词: 姿态稳定, DEVS建模, 微振动, 多普勒中心频率

Abstract: Ultrahigh-spatial-resolution and high-temporal-revisit appear to be realizable for future space-borne imaging missions. By taking advantage of satellites on the geosynchronous orbit, the wide-area continuous monitoring capacity to ground target zones becomes possible. Focus on the imaging target displacement, it is necessary to study the platform jitter during the conceptual modeling phase. Discrete Event System Specification (DEVS) is employed to abstract the observation area as an event generator. The attitude stabilization is digitalized and both theoretical analysis and simulation experiments of Gaussian-excited signals are provided. Simulation results show that the distributions of attitude responses preserve the normality. The offset distance of intersections between the optical axis and the ground could be more than ten kilometers, and the maximum estimation error of Doppler centroid frequencies is tens of Hertz. The conclusions help to improve the design accuracy of the geosynchronous satellite monitoring modeling.

Key words: attitude stabilization, DEVS-based modeling, micro-vibration, Doppler centroid