A covariance analysis tool for assessing fundamental limits of SIM pointing performance

David S. Bayard; Bryan H. Kang

doi:10.1117/12.735137

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14 September 2007 A covariance analysis tool for assessing fundamental limits of SIM pointing performance

David S. Bayard, Bryan H. Kang

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Proceedings Volume 6675, Optical Modeling and Performance Predictions III; 667508 (2007) https://doi.org/10.1117/12.735137
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

This paper presents a performance analysis of the instrument pointing control system for NASA's Space Interferometer Mission (SIM). SIM has a complex pointing system that uses a fast steering mirror in combination with a multirate control architecture to blend feedforward information with feedback information. A pointing covariance analysis tool (PCAT) is developed specifically to analyze systems with such complexity. The development of PCAT as a mathematical tool for covariance analysis is outlined in the paper. PCAT is then applied to studying performance of SIM's science pointing system. The analysis reveals and clearly delineates a fundamental limit that exists for SIM pointing performance. The limit is especially stringent for dim star targets. Discussion of the nature of the performance limit is provided, and methods are suggested to potentially improve pointing performance.

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David S. Bayard and Bryan H. Kang "A covariance analysis tool for assessing fundamental limits of SIM pointing performance", Proc. SPIE 6675, Optical Modeling and Performance Predictions III, 667508 (14 September 2007); https://doi.org/10.1117/12.735137

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