Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identification and adaptive control of a high-contrast focal plane
  wavefront correction system   All coronagraphic instruments for exoplanet high-contrast imaging need
wavefront correction systems to reject optical aberrations and create
sufficiently dark holes. Since the most efficient wavefront correction
algorithms (controllers and estimators) are usually model-based, the modeling
accuracy of the system influences the ultimate wavefront correction
performance. Currently, wavefront correction systems are typically approximated
as linear systems using Fourier optics. However, the Fourier optics model is
usually biased due to inaccuracies in the layout measurements, the imperfect
diagnoses of inherent optical aberrations, and a lack of knowledge of the
deformable mirrors (actuator gains and influence functions). Moreover, the
telescope optical system varies over time because of instrument instabilities
and environmental effects. In this paper, we present an
expectation-maximization (E-M) approach for identifying and real-time adapting
the linear telescope model from data. By iterating between the E-step (a Kalman
filter and a Rauch smoother) and the M-step (analytical or gradient-based
optimization), the algorithm is able to recover the system even if the model
depends on the electric fields, which are unmeasurable hidden variables.
Simulations and experiments in Princeton's High Contrast Imaging Lab
demonstrate that this algorithm improves the model accuracy and increases the
efficiency and speed of the wavefront correction.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci