各位老师和同学：
兹邀请Enrico Canuto教授于8月11上午10:00（周六）来我实验室做学术报告，请相互转告并准时参加。
报告地点：三楼会议室
报告题目：Long-distance, drag-free, low-thrust, leo formation control for earth gracity monitoring
报告摘要：The formation cantrol of a long-distance, drag-free, low-thrust, low-Earth orbit satellite is outlined, in view of future Earth-gravity monitoring missions employing long baseline interferometry(>10km) and lasting at lest six years. To this purpose, a formation consisting of two drag-free satellites, orbiting at a fixed distance in a sun-synchronous orbit, has been proposed as a baseline. Formation fluctuations are bounded by a box 500x50x50 m (along-track, cross-track and radial). Although at first sight not demanding, the formation control induces non-gravitational accelerations due to tide forces should not be impaired as their measurement is the mission goal. Requirements are formulated as four time and frequency-domain inequalities, to be suitably parameterized by control gains. Exploiting close-loop Hill's equation properties and asymptotic approximations, explicit design inequalities are obtained leading to a first-trial control design. Simulated runs through a fine spacecraft and low-Earth-orbit simulation dominated by the highly variable thermosphere drag show the first-trial design meets the tight control requirements, and demonstrates mission feasibility.
引力实验中心
2012-8-9
