"Noise Spectra in Vibratory Gyros: the Case for Modal Tuning"

Robert M’Closkey, Department of Mechanical and Aerospace Engineering, UCLA

Vibratory gyros that achieve sub degree-per-hour bias instability typically exploit frequency matching of the coriolis-coupled modes within the resonant structure. High quality factors are desired in order to boost the signal-to-noise ratio but this places stringent requirements on the degree of frequency detuning that can be tolerated. Furthermore, the coriolis-coupled modes are ideally isolated from case motion but, in practice, coupling to case linear acceleration does exist and will produce spurious rate signals, especially in high Q resonators. After an overview of how various noise sources contribute to the rate measurement spectrum, I will introduce some recent advances in the art of modifying the gyro dynamics via mass perturbation of the resonator that can simultaneously frequency tune and decouple the modes which are exploited for rate detection.

Robert M’Closkey received his PhD in 1995 from the Department of Mechanical Engineering, California Institute of Technology, under the guidance of Richard Murray. After a half-year visiting position at UC Berkeley with Andy Packard he joined the Mechanical and Aerospace Engineering Department at UCLA where he is currently a Professor. He received the NSF Career Award in 1999 and has several teaching awards from UCLA’s School of Engineering.

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