Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator

Details Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7015e..39b&link_type=abstract

Adaptive Optics Systems. Edited by Hubin, Norbert; Max, Claire E.; Wizinowich, Peter L. Proceedings of the SPIE, Volume 7015

Physics

Optics

Scientific paper

Adaptive Optics systems under study for the Extremely Large Telescopes gave rise to a new generation of algorithms for both wavefront reconstruction and the control law. In the first place, the large number of controlled actuators impose the use of computationally efficient methods. Secondly, the performance criterion is no longer solely based on nulling residual measurements. Priors on turbulence must be inserted. In order to satisfy these two requirements, we suggested to associate the Fractal Iterative Method for the estimation step with an Internal Model Control. This combination has now been tested on an end-to-end adaptive optics numerical simulator at ESO, named Octopus. Results are presented here and performance of our method is compared to the classical Matrix-Vector Multiplication combined with a pure integrator. In the light of a theoretical analysis of our control algorithm, we investigate the influence of several errors contributions on our simulations. The reconstruction error varies with the signal-to-noise ratio but is limited by the use of priors. The ratio between the system loop delay and the wavefront coherence time also impacts on the reachable Strehl ratio. Whereas no instabilities are observed, correction quality is obviously affected at low flux, when subapertures extinctions are frequent. Last but not least, the simulations have demonstrated the robustness of the method with respect to sensor modeling errors and actuators misalignments.

Affiliated with

Also associated with

No associations

Rating

Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Performances of the fractal iterative method with an internal model control law on the ESO end-to-end ELT adaptive optics simulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-791052