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Meeting	ACGS Committee Meeting 114 - Cleveland, Ohio - October 2014
Agenda Location	7 SUBCOMMITTEE A – AERONAUTIC AND SURFACE VEHICLES 7.2 Attitude Control and Estimation of High-Altitude Balloons
Title	Attitude Control and Estimation of High-Altitude Balloons
Presenter	James Forbes
Affiliation	University of Michigan
Available Downloads*	presentation
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Abstract	To better determine the expansion rate of the universe cosmologists are interested in studying the cosmic microwave background. To do so a ground-based telescope is used to measure the polarization of the cosmic microwave background. To properly calibrate the ground-based telescope a high-altitude balloon will point a calibrating microwave source at the telescope. This talk with discuss the design, building, testing, and flight of a six-pound high-altitude balloon system capable of pointing a microwave source at altitude of 15 km to 25 km. Specifically, dynamic modeling of the balloon-gondola system, estimator design, and control systems design will be discussed. A detailed discussion of a direction cosine matrix estimator used to estimate the attitude of the gondola will be given.