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Articles 2221 - 2250 of 12947
Full-Text Articles in Entire DC Network
The Statesman, V. 42, I. 02, State University Of New York At Stony Brook
The Statesman, V. 42, I. 02, State University Of New York At Stony Brook
Stony Brook Statesman-Sucolian
v. 42, i. 02
September 3, 1998, James Madison University
September 3, 1998, James Madison University
The Breeze, 1990-1999
The Breeze is the student newspaper of James Madison University in Harrisonburg, Virginia.
Faculty Senate Chronicle September 3, 1998, Heather M. Loughney
Faculty Senate Chronicle September 3, 1998, Heather M. Loughney
The University of Akron Faculty Senate Chronicle
Minutes for the regular meeting of The University of Akron Faculty Senate on September 3, 1998.
The Bg News September 3, 1998, Bowling Green State University
The Bg News September 3, 1998, Bowling Green State University
BG News (Student Newspaper)
The BGSU campus student newspaper. September 3, 1998. Volume 82-Issue 8.
The Murray Ledger And Times, September 3, 1998, The Murray Ledger And Times
The Murray Ledger And Times, September 3, 1998, The Murray Ledger And Times
The Murray Ledger & Times
No abstract provided.
September 3, 1998, The Daily Mississippian
September 3, 1998, The Daily Mississippian
Daily Mississippian (all digitized issues)
No abstract provided.
Washington University Record, September 3, 1998
Washington University Record, September 3, 1998
Washington University Record
No abstract provided.
The Montclarion, September 03, 1998, The Montclarion
The Montclarion, September 03, 1998, The Montclarion
The Montclarion
Student Newspaper of Montclair State University
Campus Chronicle (Vol. 1, No. 2), Valparaiso University
Campus Chronicle (Vol. 1, No. 2), Valparaiso University
Campus Chronicle
No abstract provided.
Montana Kaimin, September 3, 1998, Associated Students Of The University Of Montana
Montana Kaimin, September 3, 1998, Associated Students Of The University Of Montana
Montana Kaimin, 1898-present
Student newspaper of the University of Montana, Missoula.
Minimum Hardware Navigation Concept For Leo Satellites Using Information Fusion, Klaus Janschek, T. Boge, M. Krasilshikov, V. Dishel, M. Jacobson
Minimum Hardware Navigation Concept For Leo Satellites Using Information Fusion, Klaus Janschek, T. Boge, M. Krasilshikov, V. Dishel, M. Jacobson
Small Satellite Conference
Improved operational autonomy is required for the operation of any single satellite within a LEO satellite network. One onboard function, which is an interesting candidate to be implemented with an increased level of onboard autonomy is apparently the navigation function, which is in charge of the determination of the instantaneous satellite orbital position and attitude. This paper aims to demonstrate the capabilities of a minimum hardware configuration which could be an interesting candidate for the cost optimized implementation of the onboard navigation function. The hardware baseline consists of one integrated GPS/GLONASS receiver as primary equipment for nominal operation. Backup navigation …
High Accuracy Attitude Determination And Control Of The Diva Mission, Matthias Wiegand, Stephan Theil, Thomas Diedrich, Oliver Matthews
High Accuracy Attitude Determination And Control Of The Diva Mission, Matthias Wiegand, Stephan Theil, Thomas Diedrich, Oliver Matthews
Small Satellite Conference
Small satellite missions for scientific purpose gained more and more importance during the last years in Germany. There are several missions inorbit or scheduled for launch in the near future like GFZ (1995), Equator-S (inorbit, launch Dec 1997), ABRIXAS (launch April 1999) and other missions are on the horizon. One of these highly ambitious projects is the small astrometry satellite DIVA (German Interferometer for Multichannel Photometry and Astrometry). DIVA will be the successor of the HIPPARCOS satellite and a pathfinder to much larger missions like GAIA (Global Astrometric Interferometer for Astrophysics), FAME (Fizeau Astrometric Mapping Explorer) and SIM (Space Interferometry …
$3m Planetary Missions: Why Not? - Consideration Of Deep-Space Spacecraft Mission Requirements, Tomas Svitek
$3m Planetary Missions: Why Not? - Consideration Of Deep-Space Spacecraft Mission Requirements, Tomas Svitek
Small Satellite Conference
The dramatic cost reduction of the Earth orbiting spacecraft has become the established fact, over the period roughly coinciding with existence of this conference. 10-15 years ago, the median cost of the spacecraft mission was around $100M (in today's dollars). One-million dollar missions were unheard of, except in the amateur radio community. Today, missions with the total cost of under $10M are common. Besides the well-established amateur radio programs, many low-cost university-led spacecraft programs took place. Plenty of other science, technology, experimental and know-how technology transfer programs have been or are being implemented. The last remaining frontier of the low-cost …
The Catsat Attitude Control System, Chris Whitford, David Forrest
The Catsat Attitude Control System, Chris Whitford, David Forrest
Small Satellite Conference
CATSAT is a small 3-axis stabilised satellite in the STEDI program, to be launched in 1999. This paper describes the development of the attitude control system, with emphasis on the control laws. The 2 primary modes are the safe-hold and science modes. The safe-hold mode uses a momentum wheel, magnetometers and torque coils, with the "B-dot" algorithm. The science mode also uses momentum bias and torque coils, with Sun sensors and horizon sensors, to maintain 3-axis control. The use of reaction wheel control is also being studied. The expected performance is demonstrated by simulations.
Precision Control, Knowledge And Orbit Determination On A Small Spacecraft Bus: The Orbview-4 Attitutde Control System, Dewey Adams, Dominick Bruno, Piyush Shah, Brian Keller
Precision Control, Knowledge And Orbit Determination On A Small Spacecraft Bus: The Orbview-4 Attitutde Control System, Dewey Adams, Dominick Bruno, Piyush Shah, Brian Keller
Small Satellite Conference
High resolution, Earth imaging missions place stringent requirements on the spacecraft Attitude Control System (ACS) in terms of pointing accuracy, attitude knowledge, and orbit knowledge. For OrbView-4, a body scanner, the spacecraft must also be agile to maximize the number of targets that can be imaged each orbit. These requirements dictate a robust, high performance design that allows rapid target acquisition and high line scan rates for mapping while maintaining precise knowledge and control of the camera line of sight vector. The OrbView-4 ACS combines state of the art components with robust algorithm design to meet these objectives. Equipment selection, …
Optimal Combined Reaction-Wheel Momentum Management For Leo Earth-Pointing Satellites, Xiao-Jiang Chen, Willem Steyn
Optimal Combined Reaction-Wheel Momentum Management For Leo Earth-Pointing Satellites, Xiao-Jiang Chen, Willem Steyn
Small Satellite Conference
The optimal controllers for the management of 3-axis reaction-wheel momentum of ridged Earth-pointing satellites are analyzed in detail using magnetorquers and/or thrusters. Especially, two novel, optimal combined control schemes are proposed in order to achieve rapid, propellant-saving reaction wheel momentum dumping control by employing magnetorquers and thrusters. Finally simulation results are presented to demonstrate the superiority of these algorithms. These two combined algorithms could easily be applied in real-time onboard an LEO Earth-point satellite.
Research On Attitude System Of Active Magnetic Control Small Satellite, Sun Zhaowei, Yang Di
Research On Attitude System Of Active Magnetic Control Small Satellite, Sun Zhaowei, Yang Di
Small Satellite Conference
When enter orbit, small satellite often tumble as a result of disturbance. How to capture it promptly with finite magnetic torque is an important problem. Because of the coupling of dynamics and control, the small satellite control system is a nonlinear attitude control system with bounds. For high direction and steady precision, an effective method must be found. In this paper, combining with the bound conditions of magnetic torque, two methods are researched. The first is energy method. It use Lyapunov energy depletion theory, taking the Lyapunov function as a target function, determine the magnetic torque. Secondly the decoupling variable …
Miniaturized Data Processing Unit For Use On Small Satellites, Bernd Gerlach, Fritz Gliem
Miniaturized Data Processing Unit For Use On Small Satellites, Bernd Gerlach, Fritz Gliem
Small Satellite Conference
High density packaging of non rad-hard commercial of the shelf (COTS) components combined with mission specific tailored shielding, error correcting codes and latchup current breakers provides a significant reduction in mass, volume, power and cost compared to the traditional approach using rad. hard components. A prototype development of a miniaturized Data Processing Unit (DPU) exhibits the potential of the approach. The traditional approach for the ROSETTA-OSIRIS DPU is taken as reference.
The Design And Development Of The Smex-Lite Power System, Glenn Rakow, Richard Schnurr, Jr., Michael Solly
The Design And Development Of The Smex-Lite Power System, Glenn Rakow, Richard Schnurr, Jr., Michael Solly
Small Satellite Conference
This paper describes the design and development of a 250W orbit average electrical power system electronic Power Node and software for use in Low Earth Orbit missions. The mass of the Power Node is 3.6 Kg (8 lb.). The dimensions of the Power Node are 30cm X 26cm X 7.9cm (11in. X 10.25 in X 3.1 in.). The design was realized using software, Field Programmable Gate Array (FPGA) digital logic and surface mount technology. The design is generic enough to reduce the non-recurring engineering for different mission configurations. The Power Node charges one to five, low cost, 22-cell 4 AH …
The Software Design For The Wide-Field Infrared Explorer Attitude Control System, Kenneth Barnes, Charles Melhorn, Tom Phillips
The Software Design For The Wide-Field Infrared Explorer Attitude Control System, Kenneth Barnes, Charles Melhorn, Tom Phillips
Small Satellite Conference
The Wide-Field Infrared Explorer (WIRE), currently scheduled for launch in September 1998, is the fifth spacecraft in NASA's Small Explorer (SMEX) series. WIRE's mission is to perform a four month survey of galaxies with unusually high star formation rates ("starburst galaxies"). It is a momentum-biased three-axis stabilized stellar pointer which provides high-accuracy pointing and autonomous acquisition for eight to ten targets per orbit. Much of the design is based on previous SMEX missions, WIRE's short mission life and limited cryogen supply impose strict new Sun and Earth avoidance requirements which protect the instrument and preserve cryogen. This paper presents the …
Project Spartnik: Microsatellite Design, Construction, Testing, And Operation By Undergraduate Students At San Jose State University, Jeffrey Lin, Francisco Soriano, Michelle Schoenman
Project Spartnik: Microsatellite Design, Construction, Testing, And Operation By Undergraduate Students At San Jose State University, Jeffrey Lin, Francisco Soriano, Michelle Schoenman
Small Satellite Conference
Spartnik is a microsatellite under construction at San Jose State University. Three distinct payloads are being designed, fabricated, tested, and integrated by students solely at the undergraduate level. These payloads consist of a digital color camera, a Micro-Meteorite Impact Detector, and a fairly sophisticated communications package that transmits and receives data on the amateur radio frequency band. As part of a year-long senior design project, students are distributed into seven separate subsystems in which they learn about the design and construction of their specific components and how they interact in a satellite as a whole. Significant progress has been made …
Hydrogen On-Orbit Storage And Supply Spacecraft Custom Bus Design, Johan Carlson, Roy Gladden
Hydrogen On-Orbit Storage And Supply Spacecraft Custom Bus Design, Johan Carlson, Roy Gladden
Small Satellite Conference
The Hydrogen On-Orbit Storage and Supply (HOSS) mission is a proposed technology demonstration of the effects of liquid hydrogen storage and acquisition in microgravity. HOSS would test a liquid acquisition device and thermodynamic vent system (LAD/TVS) for a solar thermal thruster in an orbital environment. Previous cost estimates for a similar technology demonstrator have been estimated at as much as $300 million. Cost is the primary, driving requirement to all facets of this design and strongly influences launch vehicle and bus selection. To successfully implement this experiment, a low-cost spacecraft is proposed with a total expenditure of less than $10 …
Smaller Than Small, Faster Than Fast, Cheaper Than Cheap: The Barnacle Satellite Project, John O'Boyle, Iii, Pascal Stang, Nick Woods
Smaller Than Small, Faster Than Fast, Cheaper Than Cheap: The Barnacle Satellite Project, John O'Boyle, Iii, Pascal Stang, Nick Woods
Small Satellite Conference
The BARNACLE micro-satellite is an extremely simple low-cost space vehicle for the characterization of electronic instruments in space. The satellite was developed in less than one year by a group of seven undergraduate engineering students with no previous spacecraft design experience. The satellite was built for under $2,000 of the students own money with most of the hardware donated by industry and university sponsors. The craft includes a Motorola 68HC11 microprocessor-based subsystem for system control, with a logic system to back up the processor in the case of failure. Power is regulated by high-efficiency switching mode regulators in the power …
Feasibility Considerations For High Temperature Superconducting Transponders In Communication Satellites, Nicholas Seet
Feasibility Considerations For High Temperature Superconducting Transponders In Communication Satellites, Nicholas Seet
Small Satellite Conference
This paper provides a comprehensive, background-rich framework around which a fully developed study of the use of superconducting transponders can be generated for a specific communication satellite. The approach divides results into two categories: signal benefits, and physical constraints. Each is realized in terms of metrics and methods warranted by the current state of superconductor technology. The paper describes methods by which signal performance of superconducting transponder components may be approximated; also methods of evaluating heat generated by such a system; and finally, the selection of an appropriate cryogenic cooling system.
The Most Microsatellite Mission: Canada's First Space Telescope, Kieran Carroll, Robert Zee, Jaymie Matthews
The Most Microsatellite Mission: Canada's First Space Telescope, Kieran Carroll, Robert Zee, Jaymie Matthews
Small Satellite Conference
The MOST (Microvariability and Oscillations of STars) astronomy mission has been chosen by the Canadian Space Agency's Small Payloads Program to be Canada's first space science microsatellite, and is currently planned for launch in late 2001. The MOST science team will use the MOST satellite to conduct long-duration stellar photometry observations in space. A major science goal is to set a lower limit on the age of several nearby "metal-poor sub-dwarf" stars, which may in turn allow a lower limit to be set on the age of the Universe. To make these measurements, MOST will incorporate a small (15 cm …
Nasa-Gsfc Nano-Satellite Technology Development, Peter Panetta, Harry Culver, John Gagosian, Michael Johnson, James Kellogg, David Mangus, Theodore Michalek, Victor Sank, Steven Tompkins
Nasa-Gsfc Nano-Satellite Technology Development, Peter Panetta, Harry Culver, John Gagosian, Michael Johnson, James Kellogg, David Mangus, Theodore Michalek, Victor Sank, Steven Tompkins
Small Satellite Conference
The scientific understanding of key physical processes between the Sun and Earth require simultaneous measurements from many vantage points in space. Nano-satellite technologies will enable a class of constellation missions for the NASA Space Science Sun-Earth Connections theme. These technologies will also be of great benefit to other NASA science enterprises. Each nano-satellite will weigh a maximum of 10 kg including the propellant mass. Provisions for orbital maneuvers as well as attitude control, multiple sensors and instruments, and full autonomy will yield a highly capable miniaturized satellite. All onboard electronics will survive a total radiation dose rate of 100 krads …
Fedsat - An Advanced Micro-Satellite Based On A Microsil ™ Bus, A.J. Barrington Brown, A.N. Wicks, L. Boland, S.J. Gardner, E.C. Graham
Fedsat - An Advanced Micro-Satellite Based On A Microsil ™ Bus, A.J. Barrington Brown, A.N. Wicks, L. Boland, S.J. Gardner, E.C. Graham
Small Satellite Conference
This document illustrates the accommodation of multiple payloads on an extremely compact microsatellite structure, based on the Space Innovations Limited (SIL) MicroSIL satellite bus. The satellite defined in this paper is the design for the proposed collaboration between the Cooperative Research Centre on Satellite Systems (CRCSS) and SIL for the Australian FedSat mission. FedSat will be launched and operational for 2001, in time for the celebrations of the centenary of the Australian Federation. The bus is a 3-axis stabilised microsatellite with a mass of approximately 50-60kg. It is due for launch into 800km circular low Earth orbit (LEO). The communications …
September 2nd 1998, Hispanic News
Arbiter, September 2, Students Of Boise State University
Arbiter, September 2, Students Of Boise State University
Student Newspapers
No abstract provided.
Documents From The September 2, 1998 Meeting Of The Associated Students Of The University Of Montana (Asum), University Of Montana--Missoula. Associated Students
Documents From The September 2, 1998 Meeting Of The Associated Students Of The University Of Montana (Asum), University Of Montana--Missoula. Associated Students
ASUM Senate Documents, 1919-2007
Documents from the September 2, 1998 meeting of the Associated Students of the University of Montana (ASUM), including an agenda and meeting minutes.