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Proceedings Paper

The care and feeding of the JWST on-board event-driven system
Author(s): Vicki Balzano; Dean Zak; William Whitman
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Paper Abstract

The software architecture of the James Webb Space Telescope (JWST) includes an operational layer implemented by on-board JavaScripts that orchestrate event-driven operations. Request files specifying up to ten days of high-level science and engineering tasks and a time-ordered execution list are uploaded periodically to the on-board event-driven system. The processing of these files is dictated by on-board events. The tasks execute within their specified windows or could be skipped due to an isolated anomaly, such as a guide star locate failure. For each high-level task, the necessary flight software commands are constructed on-board according to operational rules, and positive completion confirmation is required before proceeding to the next flight software command. The event-driven nature of JWST operations presents challenges to the Science and Operations Center being constructed at the Space Telescope Science Institute. This paper will outline the design implications on science and engineering operations planning, flight real-time operations, and post-observation data management. Included will be descriptions of how the Operations Center 1) plans time-windowed tasks to ensure that the event-driven system will remain scientifically productive even when anomalies occur, 2) interfaces with and monitors JWST event-driven operations, and 3) records Observatory status information for each science image.

Paper Details

Date Published: 30 July 2010
PDF: 11 pages
Proc. SPIE 7737, Observatory Operations: Strategies, Processes, and Systems III, 77370I (30 July 2010); doi: 10.1117/12.855612
Show Author Affiliations
Vicki Balzano, Space Telescope Science Institute (United States)
Dean Zak, Computer Sciences Corp. (United States)
William Whitman, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 7737:
Observatory Operations: Strategies, Processes, and Systems III
David R. Silva; Alison B. Peck; B. Thomas Soifer, Editor(s)

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