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Washington University Record, September 3, 1998

Washington University Record

No abstract provided.

The Montclarion, September 03, 1998, The Montclarion

The Montclarion

Student Newspaper of Montclair State University

The Pacifican, September 3,1998, University Of The Pacific

All Issues - Student Newspaper, The Pacifican, Pacific Weekly

No abstract provided.

Lanthorn, Vol. 33, No. 02, September 3, 1998, Grand Valley State University

Volume 33, August 27, 1996 - April 22, 1999

Lanthorn is Grand Valley State's student newspaper, published from 1968 to the present.

Montana Kaimin, September 3, 1998, Associated Students Of The University Of Montana

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

The George-Anne, Georgia Southern University

The George-Anne

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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 …

Small Spacecraft Bus Development In The New Millennium, Michael Cully, Chuck Gay, John Thurber

Small Satellite Conference

Satellite development in the New Millennium will be characterized by shrinking schedules at lower cost with greater performance required. These characteristics will require, in response, innovative Program Management Styles. Organizational structures will have to be modified, roles and responsibilities of the technical leads will have to be reinvented, and relationships between the customer and suppliers will have to be fostered to maximize flexibility in the development of satellites in the New Millennium.

Integrated Power And Attitude Control System (Ipacs), Ted Michaelis

Small Satellite Conference

Recent advances in materials, circuit integration, and power switching have given the concept of dynamic energy and momentum storage important weight, size, and operational advantages over the conventional momentum wheel-battery configuration. Simultaneous momentum and energy storage for a three axes stabilized spacecraft can be accomplished with a topology of at least four wheels where energy (a scalar) is stored or retrieved in such a manner as to keep the momentum vector invariant. This study, instead, considers the case of two counter-rotating wheels in one axis to more effectively portray the principles involved. General scalable system design equations are derived which …

$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 …

Lessons Learned From The Miniature Sensor Technology Integration (Msti) -3 Controlled Reentry, Lesley Rahman, Preston Diamond, Todd Probert

Small Satellite Conference

This paper is presented as an overview of the lessons learned from the controlled reentry of the Air Force Miniature Sensor Technology Integration program's third satellite (MSTI-3). Since the launch of Sputnik in 1957, the amount of space debris in orbit has progressively increased to potentially hazardous levels. In light of these facts, the National Space Policy directs the United States to minimize the creation of space debris. NASA has already adopted a policy to limit the generation of orbital debris, and DoD policy has supported debris minimization for well over a decade. The MSTI-3 spacecraft was neither designed, nor …

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

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, …

Low Cost Approaches To Personal Communications Satellites, John Hanson, Rick Fleeter, Scott Mcdermott, Ray Zenick

Small Satellite Conference

Over the next few years several communications satellite constellations will become operational, each promising some form of wireless voice or data communication available globally. These systems offer high throughput two-way communications, but at a cost of one to fifteen billion dollars in capital investment. This makes entry into the personal communication satellite market difficult, if not impossible, for the small spacecraft industry. However, AeroAstro has determined that constellations of microspacecraft can still provide services in this market, at a fraction of the investment. The key is to identify niche markets that are not being served by the larger constellations and …

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

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

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

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

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 …

Uasat: A Student Satellite Project, Christopher Lewicki

Small Satellite Conference

This paper introduces UASat, of the Student Satellite Project at the University of Arizona in Tucson, Arizona. UASat is a small satellite that is being designed to launch from the Space Shuttle Hitchhiker Ejection System. Its unique inception history will be described, and student-proposed mission reviewed. Its broad-based participation and cross-disciplinary involvement will be presented. Its current progress and future schedule will be detailed.

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.

A Small/Micro-/Pico- Satellite Program For Investigating Thunderstorm-Related Atmospheric Phenomena, Christopher Kitts

Small Satellite Conference

A low cost, multi-satellite program for conducting novel atmospheric science is described. The program exploits simple visual and radio frequency sensing in order to investigate atmospheric phenomena induced by thunderstorms. The science instrumentation is supported by a variety of standalone and collaborative small, micro-, and picosatellite vehicles in order to meet the program's science requirements while also exploring a spectrum of small satellite approaches for conducting meaningful science. This multi-mission program is being developed jointly by student design teams at Stanford University and Santa Clara University.

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

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 …

Overview Of The Orbiting Radio Communications Asset (Orca) Mission, Darby Cooper, William Byrd, Robert Sternowski

Small Satellite Conference

The Orbiting Radio Communications Asset (ORCA) mission is a commercial mission being designed and built by neoStar Astronautics in cooperation with the Iowa Space Grant Consortium and Rockwell Collins. The mission will utilize advanced technology digital radio equipment provided by Rockwell to survey the low Earth orbit radio spectrum. This survey is of interest to both the commercial communications industry and to the scientific radio astronomy community. In addition to the survey, the spacecraft will provide an on-orbit transmit and receive test platform for advanced communications technologies that can be fully reprogrammed from the control station. A significant feature of …

Lunarsat: European Orbiter Mission To The Moon, Peter Eckart, Andy Phipps, Jeff Ward, Jan-Erik Wahlund

Small Satellite Conference

LunARSat, the Lunar Academic and Research Satellite, is a micro-spacecraft that will be sent into an orbit around the Moon to perform scientific investigations concerning the lunar environment and its characteristics. However, the prime objective of the LunARSat mission is to serve as an educational and outreach project. LunARSat is designed by young engineers, scientists, and students from around Europe, with support from numerous institutions and space industry. It shall be launched as an auxiliary payload on an Ariane 5 ASAP platform and will have a mass of 100 kg in GTO. LunARSat will orbit the Moon on a highly …

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 …

Techsat 21 - Space Missions Using Collaborating Constellations Of Satellites, Alok Das, Richard Cobb

Small Satellite Conference

New technologies for power systems, electronics, micro-electro-mechanical systems, structures, and payloads are enabling significant reduction in the size, cost, and weight of satellites. It is estimated that satellites supplying 1 kW prime power with 1 GFLOP processing capability can be mass-produced at less than 100 kg in the near future. These capable, lightweight, low cost micro-satellites open up new vistas for space system architectures. Concepts are presented which distribute the function of a satellite to a cluster of such micro-satellites flying in formation. It is shown that simply subdividing a satellite into smaller pieces does not in itself offer more …

The Ticker, September 2, 1998

The Ticker

The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.

September 2nd 1998, Hispanic News

Inland Empire Hispanic News

No abstract provided.