Mr. Prashant A. Kaswekar Profile

Prashant A. Kaswekar

at Deutsches SOFIA Institut

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Proceedings Article | 22 July 2014 Paper

The integrated motion measurement simulation for SOFIA

Prashant Kaswekar, Benjamin Greiner, Jörg Wagner

Proceedings Volume 9145, 91454F (2014) https://doi.org/10.1117/12.2054900

KEYWORDS: Telescopes, Mirrors, Sensors, Space telescopes, Motion measurement, Motion models, Device simulation, Motion estimation, Observatories, Gyroscopes

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The Stratospheric Observatory for Infrared Astronomy SOFIA consists of a B747-SP aircraft, which carries aloft a 2.7-meter reflecting telescope. The image stability goal for SOFIA is 0:2 arc-seconds rms. The performance of the telescope structure is affected by elastic vibrations induced by aeroacoustic and suspension disturbances. Active compensation of such disturbances requires a fast way of estimating the structural motion. Integrated navigation systems are examples of such estimation systems. However they employ a rigid body assumption. A possible extension of these systems to an elastic structure is shown by different authors for one dimensional beam structures taking into account the eigenmodes of the structural system. The rigid body motion as well as the flexible modes of the telescope assembly, however, are coupled among the three axes. Extending a special mathematical approach to three dimensional structures, the aspect of a modal observer based on integrated motion measurement is simulated for SOFIA. It is in general a fusion of different measurement methods by using their benefits and blinding out their disadvantages. There are no mass and stillness properties needed directly in this approach. However, the knowledge of modal properties of the structure is necessary for the implementation of this method. A finite-element model is chosen as a basis to extract the modal properties of the structure.

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