Show simple item record

dc.contributor.authorRomano, M.
dc.contributor.authorAgrawal, B.N.
dc.dateAugust 2002
dc.date.accessioned2013-07-18T19:18:20Z
dc.date.available2013-07-18T19:18:20Z
dc.date.issued2002
dc.identifier.citationAIAA-2002-5030, AIAA Guidance, Navigation and Control Conference, Monterey, CA, August 2002.
dc.identifier.urihttp://hdl.handle.net/10945/34488
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.2514/6.2002-5030en_US
dc.description.abstractThe present paper reports the results of numerical simulations carried out on a model of the Bifocal Relay Mirror spacecraft. This spacecraft consists of two large mechanically and optically coupled telescopes, used to redirect a laser beam from a ground-based, airborne or spacecraft based source to a distant target point on the earth or in space. The two telescopes are gimbaled and the spacecraft inertia has a large variation during the angle maneuvers needed to maintain the laser cross link. Moreover the spacecraft has very tight pointing and jitter requirements. The task of the presented simulations was to preliminarily validate and compare two different control approaches proposed for the tracking and pointing of the target of the Bifocal Relay Mirror. The attitude control system consists of reaction wheels, star trackers and rate gyros. The optical control system consists of two two-axis fast steering mirrors and two optical tracker sensors. In the first control option considered, feedforward and PD feedback are used for the spacecraft attitude control, while PID feedback is used for the optical subsystem, in order to compensate the pointing error. In the second control approach, the spacecraft and the optical control systems are integrated.en_US
dc.rightsThis publication is a work of the U.S. Government as defined
in Title 17, United States Code, Section 101. As such, it is in the
public domain, and under the provisions of Title 17, United States
Code, Section 105, is not copyrighted in the U.S.en_US
dc.titleTracking and Pointing of Target by a Bifocal Relay Mirror Spacecraft Using Attitude Control and Fast Steering Mirrors Tiltingen_US
dc.contributor.departmentDepartment of Mechanical and Aerospace Engineering


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record