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Proceedings Paper

NGST fine guidance sensor
Author(s): Neil Rowlands; John Hutchings; Richard G. Murowinski; Russ Alexander
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Paper Abstract

Instrumentation for the Next Generation Space Telescope (NGST) is currently in the Phase A definition stage. We have developed a concept for the NGST Fine Guidance Sensor or FGS. The FGS is a detector array based imager which resides in the NGST focal plane. We report here on tradeoff studies aimed at defining an overall configuration of the FGS which will meet the performance and interface requirements. A key performance requirement is a noise equivalent angle of 3 milli-arcseconds to be achieved with 95% probability for any pointing of the observatory in the celestial sphere. A key interface requirement is compatibility with the architecture of the Integrated Science Instrument Module (ISIM). The concept developed consists of two independent and redundant FGS modules, each with a 4' x 2' field of view covered by two 2048 x 2048 infrared detector arrays, providing 60 milli-arcsecond sampling. Performance modeling supporting the choice of this architecture and the trade space considered is presented. Each module has a set of readout electronics which perform star detection, pixel-by-pixel correction, and in fine guiding mode, centroid calculation. These readout electronics communicate with the ISIM Command & Data Handling Units where the FGS control software is based. Rationale for this choice of architecture is also presented.

Paper Details

Date Published: 5 March 2003
PDF: 12 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461926
Show Author Affiliations
Neil Rowlands, EMS Technologies Canada Ltd. (Canada)
John Hutchings, Herzberg Institute of Astrophysics/NRC (Canada)
Richard G. Murowinski, Herzberg Institute of Astrophysics/NRC (Canada)
Russ Alexander, Canadian Space Agency (Canada)

Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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