面向空间引力波探测的非接触式卫星平台无拖曳控制技术

Drag-Free Control of Non-contact Satellite Platform for Space Gravitational Wave Detection

空间引力波探测任务中,为保证作为惯性基准的检验质量不受扰动,航天器需采用高精度无拖曳控制技术,让卫星平台实时跟踪检验质量块。同时星间激光测距对航天器的指向也提出了较高要求。为满足空间引力波探测的需求,本文提出了一种基于非接触式卫星平台的无拖曳控制方法。该方法基于分舱式卫星平台设计,利用载荷舱与平台舱之间的磁浮机构替代传统无拖曳卫星中的微推进器来控制载荷舱,让载荷舱跟踪检验质量块,同时平台舱跟踪载荷舱,实现高精度的拖曳补偿和平台指向。仿真结果表明,非接触式卫星平台姿态指向精度为6×10^(-4o),姿态指向稳定度为2×10^(-4)(°)/s,无拖曳补偿后检验质量上的残余扰动加速度水平约为10^(-15)m/(s^(2)·Hz^(1/2))。

In the mission of space gravitational wave detection,to ensure that the test mass as the inertial reference is not disturbed,the spacecraft needs to adopt the high-precision drag-free control technology so that the satellite platform can follow the test mass.At the same time,the inter-satellite laser ranging also puts forward high requirements for the spacecraft pointing.To meet the needs of space gravitational wave detection,a drag-free control method based on a non-contact satellite platform is proposed.This method is based on the design of a subdivision satellite platform.The maglev mechanism between the payload cabin and the platform cabin is used to replace the micro-propeller in the traditional satellite to control the payload cabin.The payload cabin follows the test mass while the platform cabin follows the load cabin,in order to achieve the high-precision drag compensation and platform pointing.The simulation results show that the attitude pointing accuracy of the non-contact satellite platform is 6×10^(-4o),the attitude pointing stability is 2×10^(-4)(°)/s,and the residual disturbance acceleration on the test mass after drag compensation is about 10m/(s^(2)·Hz^(1/2)).