Share Email Print
cover

Proceedings Paper

Bandwidth estimation for adaptive optical systems based on stochastic parallel gradient descent optimization
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Adaptive system bandwidth estimation techniques that can be applied to the adaptive optical systems based on stochastic parallel gradient descent (SPGD) optimizations are described. A useful parameter characterizing temporal dynamics of phase fluctuations resulting from the pupil-plane phase distorting layer moving at a certain velocity (wind velocity) is the Greenwood frequency. The knowledge of the Greenwood frequency and clock frequency of the adaptive control system (first order controller) allows simple estimation of the performance metric Strehl ratio. The numerical analyses indicate that the system performance can be characterized through the ratio of the Greenwood frequency and the system iterative process clock-frequency. A formula that estimates how the degradation of the adaptation performance in SPGD based compensators are derived and analyzed numerically. The bandwidth estimation for SPGD control systems with different resolution and decoupled SPGD (D-SPGD) control system is detailed.

Paper Details

Date Published: 12 October 2004
PDF: 11 pages
Proc. SPIE 5553, Advanced Wavefront Control: Methods, Devices, and Applications II, (12 October 2004); doi: 10.1117/12.561393
Show Author Affiliations
Miao Yu, Univ. of Maryland/College Park (United States)
Mikhail Vorontsov, Univ. of Maryland/College Park (United States)
U.S. Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 5553:
Advanced Wavefront Control: Methods, Devices, and Applications II
John D. Gonglewski; Mark T. Gruneisen; Michael K. Giles, Editor(s)

© SPIE. Terms of Use
Back to Top