Robert R. Romanofsky

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A new adaptive antenna array architecture for lowearth-orbit satellite ground stations is being investigated. These ground stations are intended to have no moving parts and could potentially be operated in populated areas, where terrestrial interference is likely. The architecture includes multiple, moderately directive phased arrays. The phased arrays,(More)
To lower costs and reduce latency, a network of adaptive array ground stations, distributed across the United States, is considered for the downlink of a polar-orbiting low earth orbiting (LEO) satellite. Assuming the X-band 105 Mbps transmitter of NASA's Earth Observing 1 (EO-1) satellite with a simple line-of-sight propagation model, the average daily(More)
NASA Lewis Research Center (LeRC) is developing the space and ground segnumt technologies necessary to demonsUa_ a direct data distribution (D 3) system for use in space-to-ground communication links fzom spa_r_ in low-Earthorbit (LEO) to strategically located tracking ground terminals. The key space segment technologies include a K-band (19 GHz) MMICbased(More)
To lower costs and reduce latency, a network of adaptive array ground stations, distributed across the United States, is considered for the downlink of a polar-orbiting low earth orbiting (LEO) satellite. Assuming the X-band 105 Mbps transmitter of NASA's Earth Observing 1 (EO-1) satellite with a simple line-of-sight propagation model, the average daily(More)
An experiment has been devised which will validate, in space, a miniature, high-performance receiver. The receiver blends three complementary technologies: high temperature superconductivity (HTS), pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuits (MMIC), and a miniature pulse tube cryogenic cooler.(More)
Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the Lead Center for NASA's scientific and technical information.(More)
The NASA Glenn Research Center is constructing a 616 element scanning phased array antenna using thin film BaxSrl.xTiO3 based phase shifters. A critical milestone is the production of 616 identical phase shifiers at 19 GHz with M dB insertion loss and at least 337.5° phase shift with 3 percent bandwidth. It is well known that there is a direct relationship(More)
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