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Proceedings Paper

The LINC-NIRVANA fringe and flexure tracker: Linux real-time solutions
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Paper Abstract

The correction of atmospheric differential piston and instrumental flexure effects is mandatory for optimum interferometric performance of the LBT NIR interferometric imaging camera LINC-NIRVANA. The task of the Fringe and Flexure Tracking System (FFTS) is to detect and correct these effects in a real-time closed loop. On a timescale of milliseconds, image data of the order of 4K bytes has to be retrieved from the FFTS detector, analyzed, and the results have to be sent to the control system. The need for a reliable communication between several processes within a confined period of time calls for solutions with good real-time performance. We investigated two soft real-time options for the Linux platform. The design we present takes advantage of several features that follow the POSIX standard with improved real-time performance, which were implemented in the new Linux kernel (2.6.12). Several concepts, such as synchronization, shared memory, and preemptive scheduling are considered and the performance of the most time-critical parts of the FFTS software is tested.

Paper Details

Date Published: 27 June 2006
PDF: 10 pages
Proc. SPIE 6274, Advanced Software and Control for Astronomy, 62741O (27 June 2006); doi: 10.1117/12.671616
Show Author Affiliations
Yeping Wang, Univ. of Cologne (Germany)
Thomas Bertram, Univ. of Cologne (Germany)
Christian Straubmeier, Univ. of Cologne (Germany)
Steffen Rost, Univ. of Cologne (Germany)
Andreas Eckart, Univ. of Cologne (Germany)

Published in SPIE Proceedings Vol. 6274:
Advanced Software and Control for Astronomy
Hilton Lewis; Alan Bridger, Editor(s)

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