Mr. Evan L. Kramer Profile

Evan L. Kramer

at MIT

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Publications (2)

Proceedings Article | 12 July 2023 Open Access

Sampling strategies for rotating synthetic aperture space telescopes

Evan Kramer, Joseph Green, Rebecca Masterson, David Miller

Proceedings Volume 12777, 127770A (2023) https://doi.org/10.1117/12.2688799

KEYWORDS: Design and modelling, Image resolution, Objectives, Angular momentum, Imaging systems, Telescopes, Space telescopes, Space operations, Astronomical imaging, Mirrors

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Optical imagery from space-based telescopes is one of the most valuable tools for understanding various large and small-scale processes on planetary bodies. Whether in orbit around the Earth or another body in the solar system, it is desirable to obtain the highest resolution imagery possible of the central body. The traditional approach to achieving higher resolution imagery is to increase the size of the optical payload’s aperture. However, larger aperture payloads become prohibitively difficult to manufacture and excessively expensive to design, build, launch, and operate. Application of rotating synthetic apertures (RSA), which is a form of dilute aperture imaging system, to space telescope designs have the potential to unlock the design space of low mass and cost, high resolution space telescopes. RSAs employ a high aspect ratio rectangular aperture that is spun about its principal optical axis. A complete image is formed after a 180° rotation during which multiple frames are acquired to fully sample the imaging system’s optical transfer function. The sampling strategy, which involves the number of individual frames captured and the rate of spin about the principal optical axis, is a function of the RSA’s aperture dimensions. The purpose of this work is twofold. First, an expression for resolution in reconstructed images is derived as a function of orbital altitude, RSA aperture dimensions, and amount of spatial oversampling of the target scene. This expression is used to predict potential science data return for a given orbit, RSA design, and sampling strategy. Second, a multi-objective optimization analysis is performed between reconstructed image resolution and optical telescope assembly (OTA) cost from which a Pareto frontier is defined. This analysis informs an ensuing discussion of optimal RSA aperture dimensions for achieving optimal conditions in resolution and cost. Additionally, the effects of different RSA aperture dimensions on sampling strategies are discussed. Based on these results and discussions, a high-level design for an RSA demonstration mission is proposed. Additional presentation content can be accessed on the supplemental content page.

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Proceedings Article | 10 March 2023 Poster + Paper

End-to-end sensor system modeling and validation for AR/VR/MR applications

Evan Kramer, Qing Chao, Michael Schaub, Song Chen, Wei Gao

Proceedings Volume 12415, 124150S (2023) https://doi.org/10.1117/12.2668460

KEYWORDS: Cameras, Modulation transfer functions, Simulations, Sensors, Distortion, Spatial frequencies, Monte Carlo methods, Imaging systems, Image sensors

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