Large aperture telescopes for launch with the Ares V launch vehicle

Lillie, Charles F.; Dailey, Dean; Polidan, R.

doi:10.1016/j.actaastro.2009.07.025

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…In the present landscape, space-deployable membrane structures are based on mechanical deployment [12,13], inflatable deployment [14], and elastic deployment [15]. These deployment methods are susceptible to constraints such as complexity, mechanical failures, and limitations related to weight and volume.…”

Section: Introductionmentioning

confidence: 99%

Self-Unfolding Properties of Smart Grid-Reinforced Membrane Origami

Hu,

Xia,

Tao

et al. 2024

J. Compos. Sci.

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Origami-based membrane structures have shown great potential to revolutionize the construction of deployable and lightweight space structures in the future. However, the efficient unfolding mechanism puts forward major challenges to the practical realization of space-deployable structures. Here, a smart grid-reinforced membrane origami (SGRMO) is presented. The unfolding action hinges upon the application of forces facilitated by shape memory polymer composites (SMPCs). Subsequent locking action ensues through the restoration of the initial rigidity, accomplished via cooling mechanisms. This novel structure achieves the required lightweight and functionality by employing the grid design concept and effectively reduces the decline in unfolding extent caused by irreversible plastic deformation at the crease. Its recovery properties, including unfolding angle, distance, and surface precision, are experimentally and analytically investigated under different conditions. The results indicate that the structure can be reliably unfolded into the predefined shapes. In the case of Miura-SGRMO, the optimal surface precision is attained when the angle-ψ registers at 30°. The results of this study are expected to serve as the design of ultra-large flexible solar arrays and deployable antenna structures.

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Section: Introductionmentioning

confidence: 99%

Self-Unfolding Properties of Smart Grid-Reinforced Membrane Origami

Hu,

Xia,

Tao

et al. 2024

J. Compos. Sci.

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“…Increased performance can be achieved by increasing the telescope aperture, since a telescope's spatial resolution increases linearly with its diameter (D), its collecting area is proportional to D 2 , and its sensitivity increases as D 4 . The size of the launch vehicle's payload fairing is a limiting factor for the size of space telescope, but telescope apertures ~1.7 to 2.4 times the fairing diameter can be achieved by carefully folding the telescope for launch and autonomously deploying it once reaching orbit [1].…”

Section: Introductionmentioning

confidence: 99%

Key enabling technologies for the next generation of space telescopes

2010

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The next generation of large space telescopes, including ATLAST, SAFIR, IXO and Generation-X will require the development of key technologies to enable their development at an affordable cost. This includes technologies for the rapid, low cost fabrication of ultra-light weight primary mirror segments, active figure control of primary mirror segments, high speed wavefront sensing and control, highly-packageable and scalable deployment techniques, and active vibration and thermal control for light weight structural elements to supply good pointing stability. In this paper we discuss the current state-of-the-art for these technologies and roadmaps for future development in these areas.

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“…A segmented primary mirror stitches serial arrays of sub-mirrors together to reach the optimal capabilities of a monolithic mirror. This type of space telescope can be folded for launch and deploy autonomously after reaching orbit [ 2 ]. However, high-quality images equivalent to those of a monolithic mirror can only be achieved if co-phasing of the segmented mirrors occurs.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Correction Algorithm for Eliminating Image Misalignment Effects on Co-Phasing Measurement Accuracy for Segmented Active Optics Systems

Yue

Nie

et al. 2016

PLoS ONE

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The misalignment between recorded in-focus and out-of-focus images using the Phase Diversity (PD) algorithm leads to a dramatic decline in wavefront detection accuracy and image recovery quality for segmented active optics systems. This paper demonstrates the theoretical relationship between the image misalignment and tip-tilt terms in Zernike polynomials of the wavefront phase for the first time, and an efficient two-step alignment correction algorithm is proposed to eliminate these misalignment effects. This algorithm processes a spatial 2-D cross-correlation of the misaligned images, revising the offset to 1 or 2 pixels and narrowing the search range for alignment. Then, it eliminates the need for subpixel fine alignment to achieve adaptive correction by adding additional tip-tilt terms to the Optical Transfer Function (OTF) of the out-of-focus channel. The experimental results demonstrate the feasibility and validity of the proposed correction algorithm to improve the measurement accuracy during the co-phasing of segmented mirrors. With this alignment correction, the reconstructed wavefront is more accurate, and the recovered image is of higher quality.

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Large aperture telescopes for launch with the Ares V launch vehicle

Cited by 6 publications

References 5 publications

Self-Unfolding Properties of Smart Grid-Reinforced Membrane Origami

Self-Unfolding Properties of Smart Grid-Reinforced Membrane Origami

Key enabling technologies for the next generation of space telescopes

An Efficient Correction Algorithm for Eliminating Image Misalignment Effects on Co-Phasing Measurement Accuracy for Segmented Active Optics Systems

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