The key technologies used to control FY-2 geostationary meteorological self-spinstabilized satellites were introduced in this paper.
介绍了风云二号（FY—2）地球静止轨道自旋气象卫星工程测控的关键技术。
2
The rockets are free-flight, spin-and-fin stabilized rockets, and do not have guidance systems.
火箭是无控-飞行、旋转-和-翼稳定火箭，而且没有制导系统。
3
In this paper, a new rigid body six degree of freedom model (R6D) and relevant rigid body five degree of freedom model (R5D) for trajectory prediction of spin-stabilized projectiles are advanced.