报告人

Enrico Canuto

单位

Politecnico di Torino

都灵理工大学

报告时间

8月22日10:00

报告地点

三楼会议室

报告题目

From drag-free GOCE to drag-free formation: 

control challenges    Part II

报告内容

摘要

The talk addresses drag-free and formation control of a pair of satellites in a low-Earth orbit at a long distance, up to 200 km during a 10-year mission. The mission is under study by the European  Space Agency (ESA) under the Next Generation Gravimetry Mission program, which aims to measure the temporal variations of the Earth gravity field over a long time span like GRACE (Gravity Recovery And Climate Experiment, launched in 2002). Spatial resolution on the Earth surface needs to be as good as GOCE (Gravity field and steady state Ocean Circulation Explorer 2009-2013), that means better than 100 km.

The formation distance is fixed by the baseline of an interferometric gradiometer created by the pair of satellites as in the GRACE mission (220 km distance), which in contrast with GRACE, are forced to free fall by cancelling their non-gravitational forces (drag-free control). The differential acceleration and the gravity tensor parameters are achieved by processing the formation fluctuations measured by an inter-satellite laser interferometer, and the satellite drag-free   accelerations measured by GOCE-class accelerometers. All-propulsion actuation has been selected by discarding magnetic bearing reaction wheels as attitude actuators because of vibration/noise limits on the laser metrology.

Drag-free and formation control principles will be outlined.

报告人

简介

    Enrico Canuto received his degree in Electrical Engineering from Politecnico di Torino, Turin, Italy, where he joined the staff as a Professor of Automatic Control in 1983. From 1982 to 1997, he contributed to data reduction of the European astrometric mission Hipparcos. Technological studies in view of scientific and drag-free space missions, like Gaia and GOCE, provided the opportunity of applying embedded model control to drag-free satellites and to electro-optics. He contributed to the nanobalance interferometric thrust-stand, capable of sub-micro newton accuracy. Presently, he is involved in the design of the orbit, formation and attitude control of the Next Generation Gravity Missions of the European Space Agency.