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Articles 1681 - 1710 of 1867
Full-Text Articles in Aerospace Engineering
University Nanosatellite Distributed Satellite Capabilities To Support Techsat 21, Robert J. Twiggs
University Nanosatellite Distributed Satellite Capabilities To Support Techsat 21, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A published article that included Professor Bob Twiggs titled "University Nanosatellite Distributed Satellite Capabilities to Support TechSat 21" from August 23, 1999.
The Emerald Nanosatellite Mission, Robert J. Twiggs
The Emerald Nanosatellite Mission, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "The Emerald Nanosatellite Mission" from July 22, 1999.
Emerald & Orion Formation Flying Experiment, Robert J. Twiggs
Emerald & Orion Formation Flying Experiment, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Emerald & Orion Formation Flying Experiment" from May 5, 1999.
Student Micro/Nano Space Applications, Robert J. Twiggs
Student Micro/Nano Space Applications, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Student Micro/Nano Space Applications" from April 15, 1999.
Orion Pdr: Ssdl Program Overview, Robert J. Twiggs
Orion Pdr: Ssdl Program Overview, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Orion PDR SSDL Program Overview" from April 9, 1999.
A Comparative Analysis Of The Iridium® And Globalstar® Satellite Transmission Paths, Kenneth E. Crowe
A Comparative Analysis Of The Iridium® And Globalstar® Satellite Transmission Paths, Kenneth E. Crowe
Theses and Dissertations
Globalstar and Iridium will provide valuable global communications assets for business, humanitarian aid and military operations. However, the level of coverage and the quality of the transmission path of these systems are strongly dependent on the latitude of the user and, due to their orbital characteristics, both systems provide reduced levels of coverage at low latitudes. Additionally, the L- and S-Band frequencies utilized by these systems are prone to ionospheric interference at low latitudes. The results of extensive simulation analysis indicate that the Globalstar constellation architecture provides a considerably better transmission path than Iridium's in several important areas, including path …
Joint Space Systems Operations Program, Robert J. Twiggs, Billy Smith
Joint Space Systems Operations Program, Robert J. Twiggs, Billy Smith
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs and Lt. Colonel Billy Smith on the "Joint Space Systems Operations Program" from February 8, 1999.
Opal Picosatellite Launcher, Robert J. Twiggs
Opal Picosatellite Launcher, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "OPAL Picosatellite Launcher" from February 3, 1999.
Opal Launch Opportunity, Robert J. Twiggs
Opal Launch Opportunity, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "OPAL Launch Opportunity" from February 3, 1999.
Emerald: A Low-Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Chris Kitts, Jon How
Emerald: A Low-Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Chris Kitts, Jon How
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs, Chris Kitts, and Jon How titled "EMERALD: A Low-Cost Spacecraft Mission for Validating Formation Flying Technologies" from January 19, 1999.
Emerald: A Low Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Jonathan How, Freddy Pranajaya, Bryan Palmintier
Emerald: A Low Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Jonathan How, Freddy Pranajaya, Bryan Palmintier
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs, Robert Twiggs, Jonathon How, Freddy Pranajaya, and Bryan Palmintier titled "EMERALD: A Low Cost Spacecraft Mission for Validating Formation Flying Technologies" from 1999.
Opal: Project Objectives & Development, Robert J. Twiggs
Opal: Project Objectives & Development, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
Project and development objectives for the OPAL Project from 1999.
Opal Update, Robert J. Twiggs
Opal Update, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "OPAL Update" from 1999.
Emerald: University Built Satellite Extending Communications Experimentation For The Amateur Community, Robert J. Twiggs, Freddy Pranajaya
Emerald: University Built Satellite Extending Communications Experimentation For The Amateur Community, Robert J. Twiggs, Freddy Pranajaya
Robert "Bob" Twiggs STEM Education Collection
A published report by Bob Twiggs and Freddy Pranajaya titled "Emerald: University Built Satellite Extending Communications Experimentation for the Amateur Community" from 1999.
Opal: 2nd Ssdl Microsatellite, Robert J. Twiggs
Opal: 2nd Ssdl Microsatellite, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "OPAL: 2nd SSDL Microsatellite" from 1999.
Space Systems Development Laboratory, Robert J. Twiggs
Space Systems Development Laboratory, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Space Systems Development Laboratory" from 1999.
Space Systems Development Laboratory: Teach Systems Engineering, Robert J. Twiggs
Space Systems Development Laboratory: Teach Systems Engineering, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Space Systems Development Laboratory: Teach Systems Engineering" from 1999.
Emerald: Mission Statement, Robert J. Twiggs
Emerald: Mission Statement, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
The mission statement for the EMERALD Project from 1999.
Opal: A First Generation Microsatellite That Provides Picosat Communications For The Amateur Radio Community, Robert J. Twiggs, James Cutler, Greg Hutchinson, Jeffrey Williams
Opal: A First Generation Microsatellite That Provides Picosat Communications For The Amateur Radio Community, Robert J. Twiggs, James Cutler, Greg Hutchinson, Jeffrey Williams
Robert "Bob" Twiggs STEM Education Collection
A research article written by Bob Twiggs, James Cutler, Greg Hutchinson, and Jeff Williams and published in 1999.
Design Of The Computer Subsystem For The Afit Simulation Satellite (Simsat), Michael P. Hanke
Design Of The Computer Subsystem For The Afit Simulation Satellite (Simsat), Michael P. Hanke
Theses and Dissertations
This document details the systematic development of the computer subsystem for the AFIT Simulation Satellite (SIMSAT) from Concept Exploration to Implementation. This subsystem design effort was conducted as part of a larger four-phase team design effort to implement a fully functional, user-friendly test facility to meet current AFIT teaching and research requirements. Once SIMSAT system integration is complete, control laws will execute on the free-floating "satellite" to reduce communication systems overhead and its impact on control law execution, thereby allowing for more robust control system development and execution. Control law development, simulation, and interactive control of the system will occur …
Emerald: Where We Are And Where We Are Going, Freddy Pranajaya, Bryan Palmintier
Emerald: Where We Are And Where We Are Going, Freddy Pranajaya, Bryan Palmintier
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Freddy Pranajaya and Bryan Palmintier titled "EMERALD: Where We Are and Where We Are Going" from October 29, 1998.
Emerald: The Next Squirt, Robert J. Twiggs
Emerald: The Next Squirt, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "EMERALD: The Next Squirt" from October of 1998.
Orion: A Microsatellite Testbed For Formation Flying, Robert J. Twiggs, Jonathan How
Orion: A Microsatellite Testbed For Formation Flying, Robert J. Twiggs, Jonathan How
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs and Jonathan How titled "ORION: A Microsatellite Testbed for Formation Flying" from September 3, 1998.
A Small/Micro-/Pico-Satellite Programfor Investigating Thunderstorm-Related Atmospheric Phenomena, Christopher Kitts
A Small/Micro-/Pico-Satellite Programfor Investigating Thunderstorm-Related Atmospheric Phenomena, Christopher Kitts
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Christopher Kitts titled "A Small/Micro-/Pico-Satellite Programfor Investigating Thunderstorm-Related Atmospheric Phenomena" from Septemebr of 1998.
Stanford Space Systems Development Program, Robert J. Twiggs
Stanford Space Systems Development Program, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford Space Systems Development Program" from April 21, 1998.
Emerald: A Low-Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Jonathan How, Christopher Kitts
Emerald: A Low-Cost Spacecraft Mission For Validating Formation Flying Technologies, Robert J. Twiggs, Jonathan How, Christopher Kitts
Robert "Bob" Twiggs STEM Education Collection
A published report by Bob Twiggs, Jonathan How, and Christopher Kitts titled "EMERALD: A Low-Cost Spacecraft Mission for Validating Formation Flying Technologies" from 1998.
Nanosatellite Program – A Challenge To Amsat For Collaboration To Use The Amateur Bands, Robert J. Twiggs
Nanosatellite Program – A Challenge To Amsat For Collaboration To Use The Amateur Bands, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A report published by Professor Bob Twiggs titled "Nanosatellite Program – A Challenge to AMSAT for Collaboration to Use the Amateur Bands" from 1998.
Applying Flywheel Energy Storage To Solar Electric Orbital Transfers, Mark W. Marasch
Applying Flywheel Energy Storage To Solar Electric Orbital Transfers, Mark W. Marasch
Theses and Dissertations
This study investigated the application of flywheel energy storage to minimum time, constant thrust orbital maneuvers using electric propulsion. The advantages of using stored energy to continue electric thruster operations while in eclipse were explored. The boundary value problems for several schemes of energy use were examined, and numerical solutions were found. Results of simulations utilizing energy storage were compared to results without energy storage. Schemes incorporating energy storage were found to have advantages in terms of propellant mass used, time spent in transit, and deliverable payload.
Trends. The Cassini Mission To Saturn: Plutonium As Propaganda, Ibpp Editor
Trends. The Cassini Mission To Saturn: Plutonium As Propaganda, Ibpp Editor
International Bulletin of Political Psychology
The author discusses the plutonium-carrying Cassini mission to Saturn.
Reorientations Of Flexible Spacecraft Using Momentum Exchange Devices, Kevin A. Ford
Reorientations Of Flexible Spacecraft Using Momentum Exchange Devices, Kevin A. Ford
Theses and Dissertations
We study rest-to-rest reorientations of flexible spacecraft using momentum exchange devices. A new and concise form of the equations of motion for a rigid body containing a cluster of gimbaled momentum wheels is developed using the Euler-Newton approach. Special restrictions of the gimbaled momentum wheel equations yield equations of motion for the momentum wheel cluster and the control moment gyroscope cluster. A mathematical model of a free spacecraft with Euler-Bernoulli appendages is developed. Using the assumed modes method, a complete set of equations is developed which describes the dynamics of a spacecraft with flexible appendages and gimbaled momentum wheels. Special …