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Proceedings Paper

Developing infrared array controller with software real time operating system
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Paper Abstract

Real-time capabilities are required for a controller of a large format array to reduce a dead-time attributed by readout and data transfer. The real-time processing has been achieved by dedicated processors including DSP, CPLD, and FPGA devices. However, the dedicated processors have problems with memory resources, inflexibility, and high cost. Meanwhile, a recent PC has sufficient resources of CPUs and memories to control the infrared array and to process a large amount of frame data in real-time. In this study, we have developed an infrared array controller with a software real-time operating system (RTOS) instead of the dedicated processors. A Linux PC equipped with a RTAI extension and a dual-core CPU is used as a main computer, and one of the CPU cores is allocated to the real-time processing. A digital I/O board with DMA functions is used for an I/O interface. The signal-processing cores are integrated in the OS kernel as a real-time driver module, which is composed of two virtual devices of the clock processor and the frame processor tasks. The array controller with the RTOS realizes complicated operations easily, flexibly, and at a low cost.

Paper Details

Date Published: 22 July 2008
PDF: 8 pages
Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 702128 (22 July 2008); doi: 10.1117/12.788633
Show Author Affiliations
Shigeyuki Sako, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takashi Miyata, Institute of Astronomy, The Univ. of Tokyo (Japan)
Tomohiko Nakamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
Kentaro Motohara, Institute of Astronomy, The Univ. of Tokyo (Japan)
Yuka Katsuno Uchimoto, Institute of Astronomy, The Univ. of Tokyo (Japan)
Takashi Onaka, The Univ. of Tokyo (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)


Published in SPIE Proceedings Vol. 7021:
High Energy, Optical, and Infrared Detectors for Astronomy III
David A. Dorn; Andrew D. Holland, Editor(s)

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