24 September 2012 Discovery Channel Telescope software component template and state design: principles and implementation
Author Affiliations +
Abstract
The Discovery Channel Telescope is a 4.3m astronomical research telescope in northern Arizona constructed through a partnership between Discovery Communications and Lowell Observatory. The control software for the telescope and observatory systems consists of stand-alone, state-based components that respond to triggers (external signals or internal data changes). Component applications execute on Windows, real-time, and FPGA targets. The team has developed a template for a system component, the implementation of which has yielded large gains in productivity, robustness, and maintainability. These benefits follow from the dependence of the template on common, well-tested code, allowing a developer to focus on application-specific particulars unencumbered by details of infrastructure elements such as communication, and from the separation of concerns the architecture provides, ensuring that modifications are straightforward, separable, and consequently relatively safe. We describe a repeatable design process for developing a state machine design, and show how this translates directly into a concrete implementation utilizing several design patterns, illustrating this with examples from components of the functioning active optics system. We also present a refined top-level state machine design and rules for highly independent component interactions within and between hierarchies that we propose offer a general solution for large component-based control systems.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul J. Lotz, Michael J. Lacasse, Ryan C. Godwin, "Discovery Channel Telescope software component template and state design: principles and implementation", Proc. SPIE 8451, Software and Cyberinfrastructure for Astronomy II, 845108 (24 September 2012); doi: 10.1117/12.925084; https://doi.org/10.1117/12.925084
PROCEEDINGS
18 PAGES


SHARE
RELATED CONTENT

Four-meter lunar engineering telescope
Proceedings of SPIE (September 01 1991)
Introduction of Chinese SONG Telescope
Proceedings of SPIE (September 17 2012)
Overview of LAMOST control system
Proceedings of SPIE (February 04 2003)
Galileo Telescope model identification
Proceedings of SPIE (September 18 1997)
Modeling control systems for primary mirror supports
Proceedings of SPIE (June 08 1995)
H-infinity motion control system for a 2-m telescope
Proceedings of SPIE (December 24 2002)

Back to Top