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24 September 2012 Multiple guide star acquisition software for LINC-NIRVANA
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LINC-NIRVANA is the near-infrared interferometric imaging camera for the Large Binocular Telescope. Once operational, it will provide an unprecedented combination of angular resolution, sensitivity and field of view. Its layer-oriented MCAO systems (one for each arm of the interferometer) are conjugated to the ground layer and an additional layer in the upper atmosphere. The wavefront sensors can use up to 12 natural guide stars for wavefront sensing. Up to 12 opto-mechanical units have to be accurately positioned to coincide with the positions of the natural guide stars in the focal plane. A positioning software will coordinate the motion of these units. It has to fulfill a number of requirements: Collisions between the opto-mechanical units have to be prevented at any time. The units shall be positionable as close as possible to each other without touching their neighbors. To reduce the acquisition overhead, the units shall move in parallel. Different positioning modes have to be supported: Guide star acquisition, but also positioning model corrections and common offsets will be commanded. In this presentation we will outline the requirements and use cases of the positioning software. The logic that will be used to prevent collisions will be discussed as well as the algorithm that can be used to assign the opto-mechanical units to the guide stars.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Bertram, F. Kittmann, and L. Mohr "Multiple guide star acquisition software for LINC-NIRVANA", Proc. SPIE 8451, Software and Cyberinfrastructure for Astronomy II, 845126 (24 September 2012);


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