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NuSTAR: system engineering and modeling challenges in pointing reconstruction for a deployable x-ray telescope

Harp, D. Isaiah and Liebe, Carl Christian and Craig, William and Harrison, Fiona and Kruse-Madsen, Kristin and Zoglauer, Andreas (2010) NuSTAR: system engineering and modeling challenges in pointing reconstruction for a deployable x-ray telescope. In: Modeling, Systems Engineering, and Project Management for Astronomy IV. Proceedings of SPIE. No.7738. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 77380Z. ISBN 978-0-81948-228-0. http://resolver.caltech.edu/CaltechAUTHORS:20161108-133938358

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Abstract

The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission that will make the first sensitive images of the sky in the high energy X-ray band (6 - 80 keV). The NuSTAR observatory consists of two co-aligned grazing incidence hard X-ray telescopes with a ~10 meter focal length, achieved by the on-orbit extension of a deployable mast. A principal science objective of the mission is to locate previously unknown high-energy X-ray sources to an accuracy of 10 arcseconds (3-sigma), sufficient to uniquely identify counterparts at other wavelengths. In order to achieve this, a star tracker and laser metrology system are an integral part of the instrument; in conjunction, they will determine the orientation of the optics bench in celestial coordinates and also measure the flexures in the deployable mast as it responds to the varying on-orbit thermal environment, as well as aerodynamic and control torques. The architecture of the NuSTAR system for solving the attitude and aspect problems differs from that of previous X-ray telescopes, which did not require ex post facto reconstruction of the instantaneous observatory alignment on-orbit. In this paper we describe the NuSTAR instrument metrology system architecture and implementation, focusing on the systems engineering challenges associated with validating the instantaneous transformations between focal plane and celestial coordinates to within the required accuracy. We present a mathematical solution to photon source reconstruction, along with a detailed error budget that relates component errors to science performance. We also describe the architecture of the instrument simulation software being used to validate the end-to-end performance model.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.856626DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1346652PublisherArticle
ORCID:
AuthorORCID
Harrison, Fiona0000-0003-2992-8024
Additional Information:© 2010 SPIE. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, Space Radiation Laboratory, California Institute of Technology and Space Sciences Laboratory, UC Berkeley and was sponsored by the National Aeronautics and Space Administration. References herein to any specific commercial product, process or service by trademark, manufacturer, or otherwise, does not constitute or imply its endorsement by the United States Government or the Jet Propulsion Laboratory, California Institute of Technology, the Space Radiation Laboratory, California Institute of Technology, or the Space Sciences Laboratory, UC Berkeley
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Record Number:CaltechAUTHORS:20161108-133938358
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161108-133938358
Official Citation:D. Isaiah Harp ; Carl Christian Liebe ; William Craig ; Fiona Harrison ; Kristin Kruse-Madsen ; Andreas Zoglauer; NuSTAR: system engineering and modeling challenges in pointing reconstruction for a deployable x-ray telescope. Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77380Z (August 03, 2010); doi:10.1117/12.856626
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71813
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Nov 2016 00:50
Last Modified:09 Nov 2016 00:50

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