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Browsing Space, Telecommunication, Astronomy, & Radiation Lab by Title

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Browsing Space, Telecommunication, Astronomy, & Radiation Lab by Title

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  • Pasqual, M. C.; Cahoy, K. L. (Institute of Electrical and Electronics Engineers, 2017-06)
    A bench-top polarimeter ( λ = 1064 nm) is used to measure the polarimetric Bidirectional Reflectance Distribution Function (BRDF) of several common spacecraft materials in both bistatic and monostatic geometries. The Mueller ...
  • Marinan, A. D.; Cahoy, K. L.; Bishop, R. L.; Lui, S. S.; Bardeen, J. R.; Mulligan, T.; Blackwell, W. J.; Leslie, R. V.; Osaretin, I. A.; Shields, M. (Institute of Electrical and Electronics Engineers, 2016-12)
    The microwave radiometer technology acceleration (MiRaTA) is a 3U CubeSat mission sponsored by the NASA Earth Science Technology Office. The science payload on MiRaTA consists of a triband microwave radiometer and global ...
  • Maire, Anne-Lise; Galicher, Raphael; Boccaletti, Anthony; Baudoz, Pierre; Schneider, Jean; Stam, Daphne; Cahoy, Kerri; Traub, Wes (EDP Sciences S.A., 2012-05)
    High-contrast imaging is currently the only available technique for the study of the thermodynamical and compositional properties of exoplanets in long-period orbits, comparable to the range from Venus to Jupiter. The ...
  • Maire, A. -L.; Galicher, R.; Boccaletti, A.; Baudoz, P.; Schneider, J.; Cahoy, K.; Stam, D.; Traub, W. (Amsterdam Netherlands: SPIE - The International Society for Optical Engineering, 2012)
    Several small space coronagraphs have been proposed to characterize cold exoplanets in reflected light. Studies have mainly focused on technical feasibility because of the huge star/planet flux ratio to achieve in the ...
  • Cahoy, Kerri; Hinson, David; Tyler, G. Leonard (American Geophysical Union, 2007-08-03)
    Apparent phase velocities of zonal structure, estimated from Mars Global Surveyor (MGS) electron density profiles, are used to identify and characterize SE1, the semidiurnal eastward-propagating tide with zonal wave number ...
  • Cahoy, K.; Fischer, D.; Spronck, J.; Demille, D. (SPIE - The International Society for Optical Engineering, 2010)
    Exoplanets can be detected from a time series of stellar spectra by looking for small, periodic shifts in the absorption features that are consistent with Doppler shifts caused by the presence of an exoplanet, or multiple ...
  • Aniceto, Raichelle; Cahoy, Kerri; Lohmeyer, Whitney (Wiley, 2016-04)
    This study captures the state of current satellite transponder technology, specifically, solid-state power amplifiers (SSPAs) and traveling wave tube amplifiers (TWTAs), and describes expected future advances, including ...
  • Cahoy, K.; Marinan, A.; Kerr, C.; Cheng, K.; Jamil, S. (SPIE - The International Society for Optical Engineering, 2012)
    The goal of the CubeSat Deformable Mirror Demonstration (DeMi) is to characterize the performance of a small deformable mirror over a year in low-Earth orbit. Small form factor deformable mirrors are a key technology needed ...
  • Douglas, Ewan; Allan, Gregory; Barnes, Derek; Figura, Joseph S.; Haughwout, Christian A.; Gubner, Jennifer N.; Knoedler, Alex A.; LeClair, Sarah; Murphy, Thomas J; Nikolaos, Skouloudis; Merk, John; Opperman, Roedolph A.; Cahoy, Kerri L. (Proc SPIE, 2018-09)
    The Deformable Mirror Demonstration Mission (DeMi) was recently selected by DARPA to demonstrate in-space operation of a wavefront sensor and Microelectromechanical system (MEMS) deformable mirror (DM) payload on a 6U ...
  • Defrere, D.; Stark, C.; Cahoy, K.; Beerer, I. (SPIE - The International Society for Optical Engineering, 2012)
    The inner solar system, where the terrestrial planets formed and evolve, is populated by small grains of dust produced by collisions of asteroids and outgassing comets. At visible and infrared wavelengths, this dust cloud ...
  • Webber, M. W.; Lewis, N. K.; Marley, M.; Morley, C.; Fortney, J. J.; Cahoy, K. (IOP Publishing, 2015-05-10)
    We use a planetary albedo model to investigate variations in visible wavelength phase curves of exoplanets. Thermal and cloud properties for these exoplanets are derived using one-dimensional radiative-convective and cloud ...
  • Douglas, Ewan S.; Hewawasam, Kuravi; Mendillo, Christopher B.; Cahoy, Kerri L; Cook, Timothy A.; Finn, Susanna C. Finn; Howe, Glenn A.; Kuchner, Marc, J.; Lewis, Nikole K.; Marinan, Anne D.; Mawet, Dimitri; Chakrabarti, Supriya (SPIE, 2015-09)
    We describe a set of numerical approaches to modeling the performance of spaceflight high-contrast imaging payloads. Mission design for high-contrast imaging requires numerical wavefront error propagation to ensure accurate ...
  • Cahoy, Kerri; Marley, Mark; Fortney, Jonathan (The Astrophysical Journal, 2010-11-20)
    First generation space-based optical coronagraphic telescopes will obtain images of cool gas- and ice-giant exoplanets around nearby stars. Exoplanets lying at planet-star separations larger than about 1 AU—where an exoplanet ...
  • Belikov, R.; Pluzhnik, E.; Connelley, M. S.; Witteborn, F. C.; Lynch, D. H.; Cahoy, K. L.; Guyon, O.; Greene, T. P.; McKelvey, M. E. (SPIE - The International Society for Optical Engineering, 2009-01-01)
    Direct imaging of extrasolar planets, and Earth-like planets in particular, is an exciting but difficult problem requiring a telescope imaging system with 1010 contrast at separations of 100 mas and less. Furthermore, the ...
  • Kingsbury, R. W.; Caplan, D. O.; Cahoy, K. L. (SPIE, 2016)
    The paper presents implementation and validation results for a CubeSat-scale laser transmitter. The master oscillator power amplifier (MOPA) design produces a 1550 nm, 200mW average power optical signal through the use of ...
  • Clements, E. B.; Carlton, A. K.; Joyce, C. J.; Schwadron, N. A.; Spence, H. E.; Sun, X.; Cahoy, K. (Space Weather: The International Journal of Research & Applications, 2016)
    Space weather is a major concern for radiation-sensitive space systems, particularly for interplanetary missions, which operate outside of the protection of Earth's magnetic field. We examine and quantify the effects of ...
  • Yoon, Hyosang; Sternberg, D. C.; Cahoy, Kerri (American Institute of Aeronautics and Astronautics, 2016-11)
    In this study, the authors propose a novel method to handle OOSMs in Kalman filtering. The proposed method, called the augmented fixed-lag smoother (AFLS), is based on the fixed-lag smoother (FLS) formulation, which has ...
  • Nguyen, Tam; Cahoy, Kerri (29th Annual AIAA/USU Conference on Small Satellites, 2015-08)
    CubeSat pointing capabilities have greatly improved in the past few years, paving the way for more sophisticated science and technology demonstration missions. Advances in attitude determination have led to the development ...
  • Marlow, Weston; Carlton, Ashley; Hyosang, Yoon; Clark, James; Haughwout, Christian; Cahoy, Kerri; Males, Jared; Close, Laird; Morzinski, Katie (Journal of Spacecraft & Rockets, 2017-05)
    In this study, the feasibility and utility of using a maneuverable nanosatellite laser guide star from a geostationary equatorial orbit have been assessed to enable ground-based, adaptive optics imaging of geosynchronous ...
  • Cahoy, Kerri; Zuber, Maria; Hu, R. Y. (Journal Of Geophysical Research-Planets, 2012-07-10)
    We study the condensation of CO2 in Mars' atmosphere using temperature profiles retrieved from radio occultation measurements from Mars Global Surveyor (MGS) as well as the climate sounding instrument onboard the Mars ...
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