title: Fourier transform wavefront control with adaptive prediction of the atmosphere.
abstract: Predictive Fourier control is a temporal power spectral density-based adaptive method for adaptive optics that predicts the atmosphere under the assumption of frozen flow. The predictive controller is based on Kalman filtering and a Fourier decomposition of atmospheric turbulence using the Fourier transform reconstructor. It provides a stable way to compensate for arbitrary numbers of atmospheric layers. For each Fourier mode, efficient and accurate algorithms estimate the necessary atmospheric parameters from closed-loop telemetry and determine the predictive filter, adjusting as conditions change. This prediction improves atmospheric rejection, leading to significant improvements in system performance. For a 48x48 actuator system operating at 2 kHz, five-layer prediction for all modes is achievable in under 2x10(9) floating-point operations/s.
authors.affiliation: Lawrence Livemore National Laboratory, CA 94550, USA. poyneer1@llnl.gov
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Poyneer
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Macintosh
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Véran