基于珠式模型的绳系卫星安全交会过程建模与仿真

Modeling and Simulation of Safe Rendezvous Course Using Tethered Subsatellite Based on Bead Model

安全交会是绳系卫星空间应用的一个重要拓展。为满足安全交会的高精度需求,考虑重力、拉力和阻尼力的作用建立了绳系卫星系统三维珠式模型。讨论并选择了一种匀速-匀减速展开策略,推导得到平衡位置零相对速度条件下的安全交会末端约束,在此基础上基于反馈线性化基本原理设计了一种子星喷气推力的安全交会控制律。数值仿真基于低轨道和地球同步轨道条件来进行,4个算例的仿真结果验证了珠式模型条件下,匀速-匀减速展开策略及反馈线性化交会控制律的理论可行性,且交会控制力需求表现为同步轨道低于低轨。该方法可为绳系卫星精确交会技术提供一定参考。

Safe rendezvous is an important development of the space application of tethered subsatellite. Considering the factors of gravity,tension and damping force,the three dimensional bead model is built to satisfy the high precision demand. The terminal condition for safe rendezvous in equilibrium is discussed. The deployment strategy of uniform speed-uniform deceleration and a kind of rendezvous law based on feedback linearization are also proposed. The academic feasibility of the deployment strategy and rendezvous law proposed is validated by four cases of numerical simulations in the conditions of LEO and GEO. Further more,the numerical results behave as the power requirement at GEO is less than the LEO. The method could provide a certain reference for the technology of high precision rendezvous.