2016 Scientific Ballooning Technologies Workshop Maxime Rizzo Title Attitude estimation and control for BETTII, a balloon-borne pointed observatory Oral presentation preferred. Abstract The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is a balloon payload built at NASA GSFC that will pioneer free-flying interferometry. The cryogenic instrument implements a technique that is a combination of Fourier transform spectroscopy and Michelson stellar interferometry. This technique imposes severe constraints on the attitude knowledge and pointing requirements of the balloon payload. First, we discuss and propose a recipe for the attitude estimation problem, using a multiplicative extended Kalman filter to realize the sensor fusion between the star cameras, the fiber-optic gyroscopes, and the fine guide camera. Second, we discuss our hardware and software implementation of the control system. We present design details and on-sky performance results of our sensors, actuators, and overall system: all components are commercial-grade, require no pressure vessel to function at float altitude, and the entire pointing system can be tested from the ground.
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