End-to-end simulation of the image stability for the airborne telescope SOFIA

Schoenhoff, Ulrich; Eisentraeger, Peter; Wandner, Karl; Kaercher, Hans Juergen; Nordmann, Rainer

doi:10.1117/12.389115

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…Provisions on the aircraft door like shearlayer control will reduce wind loads acting on the TA to the possible extent. But residual loads are acting within a wide range offrequency [3] on the structure having impact on the pointing stability. Besides these performance -relevant loads, aircraft -induced loads caused by rotational and I or translational accelerations are acting on the TA.…”

Section: Design Featuresmentioning

confidence: 99%

“…System analysis ofthe entire TA including bearing, vibration Isolation System, Science instruments etc. will be performed by the systemleader for SOFIA TA [3] to find out the influence on the pointing stability. Extensive eigenfrequency analysis was performed to find out sensitivity ofthe structural assembly against design changes such as variation ofmass distribution within the STA or increase ofstiffness in particular areas.…”

Section: System Analysis Of Structural Assemblymentioning

confidence: 99%

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Design and manufacturing of the CFRP lightweight telescope structure

Stoeffler

Kaindl

2000

SPIE Proceedings

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Design ofearthbound telescopes is normally based on conventional steel constructions. Several years ago thermostable CFRP Telescope and reflector structures were developed and manufactured for harsh terrestrial environments. The airborne SOFIA TA requires beyond thermostability an excessive stiffness to mass ratio for the structure fulfilling performance and not to exceed mass limitations given by the aircraft BOEING 747 SR Additional integration into A/C drives design of structure subassemblies. Thickness ofCFRP Laminates, either filament wound or prepreg manufactured need special attention and techniques to gain high material quality according to aerospace requirements. Sequential shop assembly of the structure subassemblies minimizes risk for assembling TA. Design goals, optimization oflayout and manufacturing techniques and results are presented.

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Section: Design Featuresmentioning

confidence: 99%

Section: System Analysis Of Structural Assemblymentioning

confidence: 99%

Design and manufacturing of the CFRP lightweight telescope structure

Stoeffler

Kaindl

2000

SPIE Proceedings

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“…This, however, is not the upper disturbance frequency used in the Nyquist fidelity [74], [75]. It was then further modified by Franziska Harms at the University of Stuttgart [40].…”

Section: Fidelity Assessmentmentioning

confidence: 99%

Spatial Nyquist fidelity method for structural models of opto-mechanical systems

2008

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As technology employed in complex multidisciplinary systems such as high performance telescope systems becomes ever more sophisticated, simulation is becoming more important during the initial design phases. The method of building these simulation models is often based on engineering experience with older, potentially dissimilar systems. A method is needed to measure the fidelity of simulation models so early design decisions are made based on appropriate modeling techniques.Previously, fidelity was a qualitative concept used to indicate a model's validity or accuracy. Here it is defined as the ability of a model to accurately predict chosen output figures of merit. In this thesis, a quantitative measure of fidelity, termed the Nyquist fidelity metric, is defined for commonly used structural model components. It expresses the ability of a finite element model to accurately predict structural eigenvalues based on the mesh size required by the spatial Nyquist criterion. The Nyquist fidelity method is developed which uses the fidelity metric to both assess the fidelity of existing complex models and to synthesize new multi-component models starting from architectural considerations such as geometric and material properties of the system. This method also estimates the error bound on the output figures of merit based on the fidelity levels and sensitivity analysis.The Nyquist fidelity method is applied to simple sample problems to first demonstrate the methodology and it is then applied to complex telescope models to show the accuracy and computational benefits of this method compared to current methods such as model reduction. The three high performance telescope case studies are the Modular Optical Space Telescope (MOST), the Thirty Meter Telescope, and the Stratospheric Observatory for Infrared Astronomy. It is shown in the MOST example that the Nyquist fidelity method provides a 40% improvement in computational time while assuring less than 5% modal frequency error, and less than 2.2% error in the output figure of merit.

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“…For any airborne sensing platform, the pointing accuracy is dependent on and can be limited to the accuracy of the onboard attitude solution [1,2]. As such, a key to high pointing accuracy is a robust attitude-determination system.…”

Section: Introductionmentioning

confidence: 99%

Performance Trades for Multiantenna GNSS Multisensor Attitude Determination Systems

Tehrani

Gross

2018

International Journal of Aerospace Engineering

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We present various performance trades for multiantenna global navigation satellite system (GNSS) multisensor attitude estimation systems. In particular, attitude estimation performance sensitivity to various error sources and system configurations is assessed. This study is motivated by the need for system designers, scientists, and engineers of airborne astronomical and remote sensing platforms to better determine which system configuration is most suitable for their specific application. In order to assess performance trade-offs, the attitude estimation performance of various approaches is tested using a simulation that is based on a stratospheric balloon platform. For GNSS errors, attention is focused on multipath, receiver measurement noise, and carrierphase breaks. For the remaining attitude sensors, different performance grades of sensors are assessed. Through a Monte Carlo simulation, it is shown that, under typical conditions, sub-0.1-degree attitude accuracy is available when using multiple antenna GNSS data only, but that this accuracy can degrade to degree level in some environments warranting the inclusion of additional attitude sensors to maintain the desired level of accuracy. Further, we show that integrating inertial sensors is more valuable whenever accurate pitch and roll estimates are critical.

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End-to-end simulation of the image stability for the airborne telescope SOFIA

Cited by 9 publications

References 9 publications

Design and manufacturing of the CFRP lightweight telescope structure

Design and manufacturing of the CFRP lightweight telescope structure

Spatial Nyquist fidelity method for structural models of opto-mechanical systems

Performance Trades for Multiantenna GNSS Multisensor Attitude Determination Systems

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