地心轨道引力波探测无拖曳系统平动控制策略
Translational tracking strategy of drag-free system for gravitational wave detection in geocentric orbit
郝立维 1张锦绣 2王继河 2张谕 3孙玥4
作者信息
- 1. 哈尔滨工业大学卫星技术研究所,黑龙江哈尔滨 150001
- 2. 中山大学 航空航天学院,广东深圳 518107
- 3. 中山大学天琴中心,广东珠海 519082
- 4. 上海市空间智能控制技术重点实验室,上海 201109;上海航天控制技术研究所,上海 201109
- 折叠
摘要
探讨了一种针对空间引力波探测任务的在轨无拖曳控制技术,基于未来可行的地心轨道探测任务背景进行分析设计,并对搭载两颗检验质量的在轨无拖曳系统进行航天器与质量块间相对运动动力学及耦合特性建模.同时,初步分析了任务中无拖曳系统指标和摄动,并设计了基于频域H∞最优控制理论的系统相对平动控制律.数值仿真结果表明,当双检验质量在轨无拖曳系统各检验质量按激光测距呼吸角排列时,采用无固定追踪点策略且在非敏感轴无悬浮控制输入的情况下,可以实现航天器对基准点的追踪,并满足系统频域性能指标的要求.同时,每颗检验质量的时域偏移量可以控制在微米级别,从而获得任务所需的纯引力基准.
Abstract
An on-orbit drag-free control technique for spaceborne gravitational wave detection missions was discussed.Based on the analysis and design of a possible future geocentric orbit detection mission,the relative motion dynamics and coupling characteristics between the spacecraft and mass blocks of an on-orbit drag-free system with with two test masses were modeled.At the same time,the performance index and perturbation of the drag-free system in the mission were preliminarily analyzed,and a relative translational control law based on frequency domain H∞ optimal control theory was designed.Numerical simulation results show that when the test masses of the two-test-mass on-orbit drag-free system are arranged according to the breathing angle of laser rangefinder,without a fixed tracking point strategy and without suspension control input along the non-sensitive axis,the spacecraft can achieve tracking of the reference point while meeting the frequency domain performance index of the system.At the same time,the time domain displacement of each test mass can be controlled to the micron level,thus obtaining the pure gravitational reference required by the mission.
关键词
空间引力波探测/无拖曳控制/双检验质量/H∞控制Key words
spaceborne gravitational wave detection/drag-free control/two-test-mass/H∞ theory引用本文复制引用
基金项目
广东省基础与应用基础研究重大项目(2019B030302001)
出版年
2024
国家科技期刊平台
NSTL
万方数据