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23 June 2006 On sky testing and preliminary sensor alignment for the SOFIA Telescope
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The telescope pointing control of the Stratospheric Observatory for Infrared Astronomy (SOFIA) is achieved during science observations by an array of sensors including three imagers, gyroscopes and accelerometers. In addition, throughout alignment and calibration of the telescope assembly, the High-speed Imaging Photometer for Occultation (HIPO) is used as a reference instrument. A summary of the telescope pointing control concept is given and how HIPO is used to calibrate the telescope reference systems on the sky. A method is introduced using simple maneuvers to perform initial alignment of HIPO, the imagers and the gyroscopes by means of single star observations. During the first on sky testing of the SOFIA telescope, these maneuvers were carried out and the alignment could be improved iteratively. The corresponding alignment accuracies are identified considering repeated measurements, environmental and sensor noise. Inertial and non-inertial observations, as well as measurements over the entire operational elevation range provide additional alignment and sensor performance information. Finally, an overview is presented for future improvements in alignment.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Franziska Harms, Patrick Waddell, Martin Suess, and Hans-Peter Roeser "On sky testing and preliminary sensor alignment for the SOFIA Telescope", Proc. SPIE 6267, Ground-based and Airborne Telescopes, 62670V (23 June 2006);


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