Department of Aeronautics and Astronautics: Recent submissions

Now showing items 25-27 of 503

    • Communication satellite power amplifiers: current and future SSPA and TWTA technologies 

      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 ...

    • Radiometer Calibration Using Colocated GPS Radio Occultation Measurements 

      Cahoy, K. L.; Blackwell, W. J.; Bishop, R.; Cohen, B.; Crail, C.; e.a. (Institute of Electrical and Electronics Engineers, 2014-10)
      We present a new high-fidelity method of calibrating a cross-track scanning microwave radiometer using Global Positioning System (GPS) radio occultation (GPSRO) measurements. The radiometer and GPSRO receiver periodically ...

    • Wavefront control in space with MEMS deformable mirrors for exoplanet direct imaging 

      Cahoy, K. L.; Marinan, A. D.; Novak, B.; Kerr, C.; Nguyen, T.; e.a. (SPIE-SOC Photo-Optical Instrumentation Engineers, 2013-10)
      To meet the high contrast requirement of 1 x 10(-10) to image an Earth-like planet around a sun-like star, space telescopes equipped with coronagraphs require wavefront control systems. Deformable mirrors (DMs) are a key ...