Abstract
Abstract Correcting the tip and tilt modes of optical aberrations can mitigate a large proportion of distortions in adaptive optics (AO) systems. We describe a method to greatly improve tip/tilt correction for the Keck telescopes, using a Kalman filter with a physics model conditioned by the expected tip/tilt power spectrum and vibration peaks. The model builds on similar implementations, such as that of the Gemini Planet Imager, by considering the effects of loop delays, the response of the control hardware, and systematics specific to Keck. We demonstrate improved correction in simulation, and discuss how this model could be tuned to a specific telescope and otherwise improved.
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