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Found 8 entries in the Bibliography.
Showing entries from 1 through 8
| 2017 |
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Flight software verification methods in frontier radio for solar probe plus mission Success of deep space missions requires comprehensive performance verification for all hardware and software systems on the spacecraft over a broad scope of conditions and configurations, including the telecommunications subsystem. NASA Solar Probe Plus mission uses a software-defined radio for its telecommunications; thus a dedicated suite of tests are required for verification of the radio software in addition to traditional hardware verification procedures. Frontier Radio, developed by Johns Hopkins University Applied Phy ... Kufahl, Katelyn; Wortman, Kristin; Burke, Linda; Hennawy, Joseph; Adams, Norman; Sheehi, Joseph; Published by: IEEE Aerospace Conference Proceedings Published on: Computer software selection and evaluation; Digital radio; Digital signal processing; Instrument testing; Interplanetary flight; NASA; Probes; radio receivers; Software radio; Verification; Parker Engineering |
| 2016 |
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Enabling coherent Ka-band downlink with a software-defined radio The migration to Ka-band for science downlink on deep space missions increases data rates significantly, but also presents new challenges to radio and RF system designers. One challenge is to maintain low carrier phase noise on a coherent downlink. Thermal noise on the X-band uplink that is within the bandwidth of the carrier recovery process modulates the phase of the coherent downlink. For missions that use X-band for command uplink and Ka-band for science downlink, such as the NASA Solar Probe Plus mission, the ratio of d ... Adams, Norman; Angert, Matthew; Copeland, David; Haskins, Christopher; Published by: IEEE Aerospace Conference Proceedings Published on: Additive noise; Interplanetary flight; NASA; Radio navigation; Software radio; Parker Engineering |
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Data acquisition performance for deep space communications in solar probe plus frontier radio Radio receivers for deep space telecommunications require tracking loops that are robust in low signal-to-noise ratio conditions for not only carrier tracking, but also subcarrier tracking and bit synchronization. However, the loop band-widths must not be too narrow so as to accommodate Doppler dynamics, oscillator drift, and requirements for expedient and reliable data acquisition. The present work describes the data acquisition performance of Frontier Radio for the NASA Solar Probe Plus mission. The data acquisition time i ... Kufahl, Katelyn; Adams, Norman; Kirschner, William; Published by: IEEE Aerospace Conference Proceedings Published on: Automation; Clocks; NASA; Probes; Remote control; Signal receivers; Signal to noise ratio; Testing; Wages; Parker Engineering |
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The Frontier software-defined radio for the solar probe plus mission The latest adaptation of the Frontier Radio, an X/Ka-band deep space implementation, has been transitioned into a finished product for Solar Probe Plus (SPP) and future missions. Leveraging the technology readiness level (TRL) 9 software-defined radio (SDR) platform successfully flown on the Van Allen Probes (VAP) mission, the Frontier Radio now brings a low-power, low-mass, yet highly radiation-tolerant and robust SDR to deep space applications. This implementation brings with it a suite of enhanced capabilities and improve ... Haskins, Christopher; Angert, Matthew; Sheehi, Joseph; Millard, Wesley; Adams, Norman; Hennawy, Joseph; Published by: IEEE Aerospace Conference Proceedings Published on: Analog circuits; Application programs; Firmware; Interplanetary flight; Ionizing radiation; Manufacture; Power amplifiers; Probes; radio; radio receivers; signal processing; Space applications; Parker Engineering |
| 2014 |
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Optimization of deep-space Ka-band link schedules Downlink scheduling methods that minimize either contact time or data latency are described. For deep-space missions these two methods yield very different schedules. Optimal scheduling algorithms are straightforward for ideal mission scenarios. In practice, additional schedule requirements preclude a tractable optimal algorithm. In lieu of an optimal solution, an iterative sub-optimal algorithm is described. These methods are motivated in part by a need to balance mission risk, which increases with data latency, and mission ... Adams, Norman; Copeland, David; Mick, Alan; Pinkine, Nickalaus; Published by: IEEE Aerospace Conference Proceedings Published on: |
| 2013 |
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Comparison of Ka-band link design strategies for solar probe plus This study compares different strategies for planning and controlling the Ka-band downlink for NASA s upcoming Solar Probe Plus mission. This downlink provides the science data return: as such the availability of a specific pass is of less importance than the average performance of the link over an entire orbit. Three options for setting the link data rate were considered in this study: 1) a single data rate optimized for maximum effective data rate at the beginning of the pass, 2) a single data rate set to optimize return o ... Copeland, David; Adams, Norman; Published by: IEEE Aerospace Conference Proceedings Published on: |
| 2012 |
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Autonomous loop switching: Interpreting and modifying the internal state of feedback tracking loops Adams, Norman; Millard, Wesley; Copeland, David; Published by: Published on: YEAR: 2012 DOI: 10.1109/AERO.2012.6187143 |
| 2010 |
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An active cooling system for the solar probe power system The Solar Probe Plus (SPP) spacecraft will orbit the Sun closer than any other previous probe. As dictated by the current mission design, the spacecraft will achieve many perihelia as close as 9.5 R Lockwood, Mary; Ercol, Carl; Cho, Wei-Lin; Hartman, David; Adamson, Gary; Published by: 40th International Conference on Environmental Systems, ICES 2010 Published on: Cooling; Cooling systems; Orbits; Probes; Spacecraft; Testing; Thermoelectric equipment; Waste heat; Parker Engineering |
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