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Wi-Fi Signal Survey of the International Space Station by Autonomous Free-Flying Robot

Wi-Fi Signal Survey of the International Space Station by Au...

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IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

作者： Everest Yang Shian U. Hwu Chatwin Lansdowne John P. Boster Kanishka deSilva Avionic Systems Division Johnson Space Center NASA Barrios Technology JET2/Jacobs/JSC/NASA Relative Dynamics JET2/Jacobs/JSC/NASA Aerodyne Industries JET2/Jacobs/JSC/NASA

ISBN: (数字)9798350351118

ISBN: (纸本)9798350351125

This paper analyzes Wi-Fi signal propagation inside pressurized modules of the International Space Station (ISS). Various flight datasets were collected by the Astrobee fleet of autonomous free-flying robots developed by the NASA Ames Research Center (ARC). The enclosed module spaces of the ISS pose unique challenges for Wi-Fi signal propagation, and understanding these challenges is crucial for optimizing connectivity in such environments. The survey data presented are valuable for optimizing wireless access point (WAP) locations and conditions. A computational method is developed to analyze the wireless communication system, RF coverage, and module compositions. The method is both rigorous and practical for assessing the ISS wireless system performance. The computational tools in this paper serve as a complementary approach to direct, on-orbit measurements, which is a complicated and expensive task. In some operational scenarios, ground measurements may be intractable due to the size of the spacecraft. Results from this research will aid future space missions and commercial spacecraft, providing insights into optimal WAP placements and robust wireless communication systems.

关键词： Space vehicles Surveys Wireless application protocol Spatial diversity Wireless access points International Space Station Extraterrestrial measurements Reflection Wireless fidelity Robots

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Comparison and validation of FLUKA and HZETRN as tools for investigating the secondary neutron production in large space vehicles

Comparison and validation of FLUKA and HZETRN as tools for i...

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AIAA SPACE Conference and Exposition, 2015

作者： Rojdev, Kristina Koontz, Steve Reddell, Brandon Atwell, William Boeder, Paul NASA Johnson Space Center Systems Engineering and Test Branch 2101 NASA Parkway/MC:EA351 HoustonTX77058 United States NASA Johnson Space Center International Space Station System Manager for Space Environments 2101 NASA Parkway/MC:ES4 HoustonTX77058 United States NASA Johnson Space Center Avionic Systems Division 2101 NASA Parkway/MC:EV5 HoustonTX77058 United States 16623 Park Green Way HoustonTX77058 United States Boeing Research and Technology Space Environments 13100 Space Center Blvd./HB3-20 HoustonTX77058 United States

ISBN: (数字)9781624103346

ISBN: (纸本)9781624103346

NASA’s exploration goals are focused on deep space travel and Mars surface operations. To accomplish these goals, large structures will be necessary to transport crew and logistics in the initial stages, and NASA will need to keep the crew and the vehicle safe during transport and any surface activities. One of the major challenges of deep space travel is the space radiation environment and its impacts on the crew, the electronics, and the vehicle materials. The primary radiation from the sun (solar particle events) and from outside the solar system (galactic cosmic rays) interact with materials of the vehicle. These interactions lead to some of the primary radiation being absorbed, being modified, or producing secondary radiation (primarily neutrons). With all vehicles, the high energy primary radiation is of most concern. However, with larger vehicles that have large shielding masses, there is more opportunity for secondary radiation production, and this secondary radiation can be significant enough to cause concern. When considering surface operations, there is also a secondary radiation source from the surface of the planet, known as albedo, with neutrons being one of the most significant species. Given new vehicle designs for deep space and Mars missions, the secondary radiation environment and the implications of that environment is currently not well understood. Thus, several studies are necessary to fill the knowledge gaps of this secondary radiation environment. In this paper, we put forth the initial steps to increasing our understanding of neutron production from large vehicles by comparing the neutron production resulting from our radiation transport codes and providing a preliminary validation of our results against flight data. This paper will review the details of these results and discuss the finer points of the analysis. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

关键词： NASA

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Investigation of HZETRN 2010 as a tool for single event effect qualification of avionics systems – Part II

Investigation of HZETRN 2010 as a tool for single event effe...

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AIAA SPACE Conference and Exposition, 2015

ISBN: (数字)9781624103346

ISBN: (纸本)9781624103346

An accurate prediction of spacecraft avionics single event effect (SEE) radiation susceptibility is key to ensuring a safe and reliable vehicle. This is particularly important for long-duration deep space missions for human exploration where there is little or no chance for a quick emergency return to Earth. Monte Carlo nuclear reaction and transport codes such as FLUKA1,2 can be used to generate very accurate models of the expected in-flight radiation environment for SEE analyses. A major downside to using a Monte Carlo-based code is that the run times can be very long (on the order of days). A more popular choice for SEE1 calculations is the CREME963 deterministic code, which offers significantly shorter run times (on the order of seconds). However, CREME96, though fast and easy to use, has not been updated in several years and underestimates secondary particle shower effects in spacecraft structural shielding mass. Another modeling option to consider is the deterministic code HZETRN 20104, which includes updates to address secondary particle shower effects more accurately. This paper builds on previous work by Rojdev, et al.5 to compare the use of HZETRN 2010 against CREME96 as a tool to verify spacecraft avionics system reliability in a space flight SEE environment. This paper will discuss modifications made to HZETRN 2010 to improve its performance for calculating SEE rates and compare results with both in-flight SEE rates and other calculation methods. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

关键词： Monte Carlo methods

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Enabling autonomous exploration via the solar system internet

Enabling autonomous exploration via the solar system interne...

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作者： Wyatt, Jay Barkley, Erik Burleigh, Scott Estlin, Tara Jones, Ross Schoolcraft, Josh Nichols, Kelvin Pitts, Robert L. Schlesinger, Adam Fink, Patrick W. Grobe, Gary L. Jet Propulsion Laboratory California Institute of Technology United States Software and Systems Division NASA's Jet Propulsion Laboratory United States NASA Marshall Space Flight Center Huntsville AL United States United States Avionic Systems Division NASA Johnson Space Center United States

关键词： NASA

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RF electromagnetic penetration of the NASA space shuttle Endeavour performed with an ultra-wideband system

RF electromagnetic penetration of the NASA space shuttle End...

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IEEE International Symposium on Electromagnetic Compatibility, EMC 2007

作者： Johnk, Robert T. Novotny, David R. Grosvenor, Chriss A. Canales, Nino Camell, Dennis G. Koepke, Galen H. Scully, Robert C. Electromagnetics Division Time-Domain Fields Project National Institute of Standards and Technology Boulder CO United States NASA Johnson Space Center Avionic Systems Division Houston TX United States

ISBN: (纸本)1424413508

This paper summarizes a joint NIST-NASA measurement effort to thoroughly evaluate the electromagnetic penetration of the shuttle Endeavour. NASA is concerned about the effects that microwave imaging radar systems might have on critical avionics systems on its fleet of space shuttles. As part of a multifaceted effort, a portable, NIST-developed ultra-wideband measurement system was deployed at the Kennedy Space Center to evaluate electromagnetic penetration over the frequency range of 30 MHZ - 6 GHz at selected locations inside Endeavour. The measurements were performed inside a large metal hangar, which exhibited robust reverberant behavior. A combination of reverb chamber techniques and time/frequency signal processing permitted the evaluation of electromagnetic penetration at six different locations inside the orbiter.

关键词： Hangars

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RF Electromagnetic Penetration of the Nasa Space Shuttle Endeavour Performed with an Ultra-Wideband System

RF Electromagnetic Penetration of the Nasa Space Shuttle End...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Robert T. Johnk David Novotny Chriss Grosvenor Nino Canales Dennis Camell G. Koepke Robert C. Scully Electromagnetics Division Time-Domain Fields Project National Institute for Standards and Technology Boulder CO USA Avionic Systems Division NASA-Johnson Space Center Houston TX USA

关键词： Radio frequency Space shuttles Ultra wideband technology Extraterrestrial measurements Electromagnetic measurements Aerospace electronics NASA Microwave imaging Radar imaging Spaceborne radar

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Radio frequency (RF) attenuation measurements of the space shuttle vehicle

Radio frequency (RF) attenuation measurements of the space s...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： R.C. Scully B.M. Kent K.A. Brezinski D.R. Kempf R.T. Johnk Avionic Systems Division NASA-Johnson Space Center Houston TX USA Air Force Research Laboratory OH USA Electromagnetic Environmental Effects Division Naval Air Warfare Center MD USA Electromagnetics Division National Institute of Science and Technology Boulder CO USA

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Parallel multi-step/multi-rate integration of two-time scale dynamic systems

Parallel multi-step/multi-rate integration of two-time scale...

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Collection of Technical Papers - AIAA Modeling and Simulation Technologies Conference

作者： Chang, Johnny T. Ploen, Scott R. Sohl, Garett A. Martin, Bryan J. Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr. Pasadena CA 91109 United States Avionic Systems and Technology Division Autonomy and Control Section Simulation and Verification Group United States Avionic Systems and Technology Division Autonomy and Control Section Guidance and Control Analysis United States

ISBN: (纸本)1563476746

Increasing demands on the fidelity of simulations for real-time and high-fidelity simulations are stressing the capacity of modern processors. New integration techniques are required that provide maximum efficiency for systems that are parallelizable. However many current techniques make assumptions that are at odds with non-cascadablc systems. A new serial multi-step / multi-rate integration algorithm for dual-timescale continuous-state systems is presented which applies to these systems, and is extended to a parallel multi-step / multi-rate algorithm. The superior performance of both algorithms is demonstrated through a representative example. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Parallel processing systems

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Polar traverse rover development for Mars, Europa and Earth

Polar traverse rover development for Mars, Europa and Earth

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IEEE Conference on Aerospace

作者： A. Behar F. Carsey B. Wilcox Jet Propulsion Laboratory Avionic Systems and Technology Pasadena CA USA Earth & Space Science Division Jet Propulsion Laboratory Pasadena CA USA

The history of Antarctic exploration is filled with traverses for scientific and operational purposes, and they continue to be conducted today. Similarly, traverses are a crucial part of planned planetary science and operations. This paper addresses the proposal for development of an autonomous rover capable of making such extreme environment traverses while accomplishing complex tasks.

关键词： Mars Earth Antarctica Ice Geoscience Humans Space technology Aerospace electronics Propulsion Laboratories

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The Antarctic Ice Borehole Probe

The Antarctic Ice Borehole Probe

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IEEE Conference on Aerospace

作者： A. Behar F. Carsey A. Lane H. Engelhardt Avionic Systems and Technology Division USA Earth & Space Science Division USA Geological and Planetary Sciences Division California Institute of Technology Pasadena CA USA

ISBN: (纸本)0780365992

The Antarctic Ice Borehole Probe mission is a glaciological investigation, scheduled for November 2000-January 2001, that will acquire visible-light images and video in a hot-water drilled hole in the West Antarctic ice sheet. The objectives of the probe are to observe ice-bed interactions with a downward looking camera, and ice inclusions and structure, including hypothesized ice accretion, with a side-looking camera. The Probe mission also serves as a stepping-stone in the development of technology to acquire data in extreme ice and liquid environments. The information and experience will aid projects involving exploration in ice/liquid environments, including missions to Lake Vostok in Antarctica, Mars Polar Caps and Europa, Jupiter's moon. This focus of this paper is to describe the design and use of the probe.

关键词： Antarctica Ice Probes Cameras Space technology Lakes Propulsion Laboratories Aerospace electronics Geoscience

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