Stochastic performance analysis and staged controller designs for space interferometry systems

Details Stochastic performance analysis and staged controller designs for space interferometry systems Stochastic performance analysis and staged controller designs for space interferometry systems

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4852..556l&link_type=abstract

Interferometry in Space. Edited by Shao, Michael. Proceedings of the SPIE, Volume 4852, pp. 556-567 (2003).

Statistics

Methodology

Scientific paper

During the preliminary design phase of space-based interferometer missions, observational requirements need to be translated into dynamical accuracy requirements on the optical components. The first part of this paper presents a methodology that specifies allowable statistical variances on the optical path difference in order to achieve a specified mean level of null depth for a nulling interferometer. These dynamical requirements can then be used as inputs to controller design processes which ensures that the closed-loop system satisfies the performance requirements. The second part of this paper describes a staging control design tool that optimally uses a suite of actuators to reject disturbances and analyzes the performance limitations as a function of actuator constraints. The particular actuator constraints considered here are saturation limit, resolution level, and the operational bandwidth of each actuator. As an example, the control design tool is applied to an example optical delay line problem yielding a feedback control law which ensures nanometer level stabilization of optical path difference for the interferometer. This benchmark problem allows the control design tool to demonstrate its capabilities on a system with stringent dynamical requirements.

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