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Articles 3031 - 3060 of 14881
Full-Text Articles in Entire DC Network
Revolutionary Propulsion Concepts For Small Satellites, Steven Wassom
Revolutionary Propulsion Concepts For Small Satellites, Steven Wassom
Small Satellite Conference
This paper addresses the results of a trade study in which four novel propulsion approaches are applied to a 100-kg-class satellite designed for rendezvous, reconnaissance, and other on-orbit operations. The technologies, which are currently at a NASA technology readiness level of 4, are known as solar thermal propulsion, digital solid motor, water-based propulsion, and solid pulse motor. Sizing calculations are carried out using analytical and empirical parameters to determine the propellant and inert masses and volumes. The results are compared to an offthe- shelf hydrazine system using a trade matrix “scorecard.” Other factors considered besides mass and volume include safety, …
Micro Digital Solar Attitude Detector And Imager, Stephen Jaskulek, Kim Strohbehn, Mark Martin
Micro Digital Solar Attitude Detector And Imager, Stephen Jaskulek, Kim Strohbehn, Mark Martin
Small Satellite Conference
The Johns Hopkins University Applied Physics Laboratory (JHU/APL) has developed the first generation of a micro digital solar attitude detector (DSAD). The micro-DSAD (ìDSAD) design is based on our patented approach of combining a centroiding position-sensitive active-pixel architecture with standard imaging capability for providing optional “engineering channel” images. This approach avoids the need for a DSP (digital signal processor) in computing the position, thus dramatically lowering the required mass and power resources. The ìDSAD technology is presently at Technology Readiness Level (TRL) 5. We have demonstrated robust performance, significant total dose radiation tolerance, and single-event latchup immunity on small format …
Design And Development Of A Compact Magnetic Bearing Momentum Wheel For Micro And Small Satellites , Michael Scharfe, Thomas Roschke, Enrico Bindl, Daniel Blonski
Design And Development Of A Compact Magnetic Bearing Momentum Wheel For Micro And Small Satellites , Michael Scharfe, Thomas Roschke, Enrico Bindl, Daniel Blonski
Small Satellite Conference
Reaction and momentum wheels have become standard equipment for three-axis attitude stabilisation of conventional satellite classes as used e.g. for telecommunication and remote sensing missions. Owing to very compact mechanical designs and highly integrated electronics, wheels are now also more and more interesting for small satellites up to 100…200 kg with increasingly demanding requirements on attitude control. Wheels suitable for small satellites have a typical momentum capacity up to approximately 0.4 Nms, and masses up to about 2 kg. All existing miniature wheels known to the authors are relying on ball bearings for rotor suspension, which may limit the lifetime …
A Nanosatellite Mission To Investigate Equatorial Ionospheric Plasma Depletions: The U. S. Air Force Academy’S Falconsat-2, L. Habash Krause, J.J. Sellers, C.L. Enloe, R. Humble, J. White
A Nanosatellite Mission To Investigate Equatorial Ionospheric Plasma Depletions: The U. S. Air Force Academy’S Falconsat-2, L. Habash Krause, J.J. Sellers, C.L. Enloe, R. Humble, J. White
Small Satellite Conference
An overview of the United States Air Force Academy’s (USAFA’s) FalconSat-2, a nanosatellite designed to investigate F region ionospheric plasma depletions, is presented. Instruments aboard FalconSat-2 will sample in situ plasma density and temperature at a rate of 10 Hz and 1.0 Hz, respectively. The choice of sampling rate provides for resolution of 2-10 km plasma depletions, important since plasma anisotropies of this scale size are known to disrupt Ultra High Frequency (UHF) radio transmissions. A novel sensor, the Miniature Electrostatic Analyzer (MESA), is presently under development by USAFA faculty and will be used to measure plasma density with its …
Use Of An Operations Simulator For Small Satellites, Sid Saraf, Chahé Adourian, Philip Melanson, Mak Tafazoli
Use Of An Operations Simulator For Small Satellites, Sid Saraf, Chahé Adourian, Philip Melanson, Mak Tafazoli
Small Satellite Conference
The Canadian Space Agency (CSA) has initiated the Science Satellite (SCISAT) mission as part of its ongoing space science program. The SCISAT-1 satellite will be operated from CSA's mission operation centre in St- Hubert, Québec. The use of an operations simulator is critical in mitigating any mission level risk. During an anomaly situation the operation team's only line of defence against a mission failure could be the simulator. The SCISAT-1 simulator could also be an effective tool to ensure that commands or command sequences that are detrimental to the spacecraft or the science planning are not up-linked accidentally. The best …
Getting Started: Using A Global Circumnavigation Balloon Flight To Explore Picosatellite (Cubesat) Technology, Keith Bennett, Michael Swartwout, Barry Tobias, Patrick Mcnally
Getting Started: Using A Global Circumnavigation Balloon Flight To Explore Picosatellite (Cubesat) Technology, Keith Bennett, Michael Swartwout, Barry Tobias, Patrick Mcnally
Small Satellite Conference
Washington University's Project Aria is currently involved in the CubeSat program. Project Aria is a student-led engineering education, research, and K-12 outreach program. The project’s CubeSat goal is the development of a spherical imaging spacecraft, the "Palantir", ready for launch in late 2002. Recently, the Palantir team was offered the opportunity to fly a small payload on a global circumnavigation balloon flight in mid-2001. The payload would collect atmospheric data such as temperature, pressure, and humidity. The student team decided to use this opportunity to explore various technologies they plan for Palantir. This resulting in a fast, challenging engineering project …
The Use Of Hibernation Modes For Deep Space Missions As A Method To Lower Mission Operations Costs , E. Reynolds, P. Panneton, M. Reinhart, D. Mehoke, W. Dellinger, S. Williams, J. Perschy, R. Harvey, P. Carr
The Use Of Hibernation Modes For Deep Space Missions As A Method To Lower Mission Operations Costs , E. Reynolds, P. Panneton, M. Reinhart, D. Mehoke, W. Dellinger, S. Williams, J. Perschy, R. Harvey, P. Carr
Small Satellite Conference
Hibernation modes have been used in the past in the commercial and military sector under the name of ‘on-orbit storage’ or ‘onorbit spare’. Satellites that have used this technique include: METEOSAT-5 (Europe). SOOS (Navy), NOVA (Navy), GOES-10 (NOAA). These spares are used to quickly restore functionality of the system if there should be an on-orbit failure. Up until now, scientific satellites have not incorporated hibernation modes in their baseline mission timeline – though several missions used them to perform extended missions: GIOTTO and ISEE- 3/ICE. During its competitive proposal phase, CONTOUR baselined a hibernation mode as a method to reduce …
Tu Sat 1—An Innovative Low-Cost Communications Satellite , Jacob Oehrig, Jeremy Schea, Adam Bennett, Noel Schutt, John Lee, W.C. Holmes, Dave Prentice, Andrew Platt, David Voss, Jonathan Voss, Jeffery Dailey, H.D. Voss
Tu Sat 1—An Innovative Low-Cost Communications Satellite , Jacob Oehrig, Jeremy Schea, Adam Bennett, Noel Schutt, John Lee, W.C. Holmes, Dave Prentice, Andrew Platt, David Voss, Jonathan Voss, Jeffery Dailey, H.D. Voss
Small Satellite Conference
Taylor University (TU), an undergraduate liberal arts university, is developing a communication Cube- Sat. TU Sat 1 incorporates powerful microelectronics, a gravity gradient boom, and a low-cost email communications system capable of operating at a 115-kbps rate near 0.9 GHz. The goal is to demonstrate low cost communication for remote villages in third world countries. TU Sat 1 also includes a magnetometer and Langmuir probe to measure plasma density and temperature at an altitude of 650 km. Furthermore, TU Sat 1 provides students with the needed experience and skills to be on the leading edge of innovation.
Design Of A Distributed Ground Support System For Small Satellites, R.M. Barry, P.J. Bakkes
Design Of A Distributed Ground Support System For Small Satellites, R.M. Barry, P.J. Bakkes
Small Satellite Conference
On February 23, 1999 South Africa's first satellite SUNSAT was launched. The satellite was designed and built entirely at the University of Stellenbosch, a project spanning 8 years. Up to 1999 the bulk of the development work was done on the satellite itself, with time constraints limiting the work done on the ground support system. This led to a situation where the ground station was developed in the two months prior to the launch and shortly afterwards. The system was developed with the specific purpose of supporting only SUNSAT. The final product was a ground support system consisting of a …
Development Of Formation Flight And Docking Algorithms Using The Spheres Testbed, Allen Chen, Alvar Saenz-Otero, Mark Hilstad, David Miller
Development Of Formation Flight And Docking Algorithms Using The Spheres Testbed, Allen Chen, Alvar Saenz-Otero, Mark Hilstad, David Miller
Small Satellite Conference
The MIT Space Systems Laboratory is developing the SPHERES formation flight testbed to provide the Air Force and NASA with a long term, replenishable, and upgradable testbed for the validation of high risk metrology, control, and autonomy technologies. These technologies are critical to the operation of distributed satellite and docking missions such as TechSat21, Starlight, Terrestrial Planet Finder, and Orbital Express. To approximate the dynamics encountered by these missions, the testbed consists of three microsatellites, or “spheres,” which can control their relative positions and orientations in six degrees of freedom. The testbed can operate in 2-D on a laboratory platform …
The Pcsat Mission And Cubesat Design Notes, Bob Bruninga, Ens Boutros, Ens Nolan, Ens Schwenzer, Ens Lawrence, Ltcl B. Smith, D. Boden
The Pcsat Mission And Cubesat Design Notes, Bob Bruninga, Ens Boutros, Ens Nolan, Ens Schwenzer, Ens Lawrence, Ltcl B. Smith, D. Boden
Small Satellite Conference
There are growing opportunities for Universities to gain educational access to Space. The Naval Academy has used the Department of Defense Space Test Program for its PCsat and Sapphire projects and the Stanford Cubesat program offers a unique opportunity to get numerous small student satellite payloads into space. As a spin-off of our PCsat project, we have investigated several off-the-shelf solutions to the Telemetry, Command and control portion of small satellites that can greatly simplify small satellite and CubeSat designs. This permits students to concentrate on the various payloads and other aspects of the project without starting from scratch with …
Aquagsat – A Sun Pointing Picosatellite Powered By A Regenerative Fuel Cell, Thomas Lowery, Kyle Ottinger
Aquagsat – A Sun Pointing Picosatellite Powered By A Regenerative Fuel Cell, Thomas Lowery, Kyle Ottinger
Small Satellite Conference
A unique opportunity of low-cost access to space in is being offered to many educational institutions and commercial interests around the world. The Cubesat program offers launch opportunities for pico-satellites (< 1kg) which can be built for a reachable price range, thus extended the access to space out further into the publics grasp. The current cubesat projects offer up to 200 grams of payload to be for small lowearth- orbit (LEO) experiments. Along with the increasing trend in small spacecraft, alternate forms of power are being developed. Such as the unitized regenerative fuel cell (URFC). A URFC extracts the energy from the formation of H2O and utilizes it as power. The URFC has the ability to then reverse the process inputting the power necessary to break down the H2O into H2 and O2 and storing the products. Thus, applied to space applications URFC serves as a nonhazards, cheap, and infinitely renewable energy source. AquaGSat will utilize this access to lowearth- orbit (LEO) by providing a platform for a small URFC and other experiments of similar power needs. This report details the preliminary design of AquaGSat “Water EnerGy” Satellite. The AquaGSat was designed with a modular vision of being able to implement similar experimental payloads that share power and attitude control requirements. Design drivers for AquaGSat are: innovation, maximize energy per volume ratio, utilization of existing technology, and simplicity. The basic shape and composition of the external shell of the spacecraft is provided by the P-POD Payload Planners Guide. P-POD will eject its cubesat load at a certain location in orbit (600 km to 800 km). Once safely away the cubesats will activate themselves and begin their mission. To accomplish AquaGSat’s mission, it is a threeaxis stabilized sun-pointing satellite, because of its large power needs. The sections that follow consider the design and analysis that were performed. Including URFC, Mission Design, P-POD requirements, Thermal, Vibration and Structural Analysis, and Attitude Determination and Control Model and Simulation results, Power and Communications subsystems.
The Design And Development Of A Terminal Node Controller And Gps/Telemetry Beacon For Space And Ground Applications , James Gutshall, Anuradha Chandrasekaran
The Design And Development Of A Terminal Node Controller And Gps/Telemetry Beacon For Space And Ground Applications , James Gutshall, Anuradha Chandrasekaran
Small Satellite Conference
This document presents the design and development of a new terminal node controller (TNC) and GPS/telemetry beacon for space and ground applications. The techniques developed are unique and innovative in the field of space communication. It outlines the objectives; the system requirements; the system layout; the theory of operation; software; communication protocols, including equipment specifications and other major aspects of the system. An important feature of this system is the extensive use of commercial off the shelf (COTS) components, which has lowered cost and shortened development time. Key words: terminal node controller, TNC, GPS, telemetry, beacon, space communications, satellite, nanosatellite, …
A Ground-Based Prototype Of A Cmos Navigational Star Camera For Small Satellite Applications , Brian Shucker
A Ground-Based Prototype Of A Cmos Navigational Star Camera For Small Satellite Applications , Brian Shucker
Small Satellite Conference
Small satellites are now capable of performing missions that require accurate attitude determination and control. However, low size, power, and cost requirements limit the types of attitude sensors that can be used on a small craft, making attitude estimation difficult. In particular, star trackers—often the attitude sensors of choice for larger spacecraft—are not practical for small satellites. This paper describes a miniature navigational star camera based on CMOS sensor technology that is appropriate for small satellite applications. A ground-based prototype version has been built to demonstrate the technology. Hardware design and algorithms for star-pattern recognition and attitude estimation are discussed, …
Low Thrust Trajectory Design For Crafti, Eric Morrow
Low Thrust Trajectory Design For Crafti, Eric Morrow
Small Satellite Conference
The Canadian Robotic Asteroid Flyby and (Tentatively) Impact project (CRAFTI) proposes to accomplish an interplanetary mission to explore an asteroid while maintaining a budget of ~US$10 million. This cost target implies a launch as a secondary payload and hence a microsatsized spacecraft. The mission objective is to send two spacecraft to encounter the near-Earth asteroid Toutatis in 2008; one of these will fly by Toutatis at close range, while the other impacts the asteroid. An electric propulsion system is being considered to provide the thrust for the orbital manoeuvres. However, the thrust level achievable by this kind of system is …
Snap-1: A Low Cost Modular Cots-Based Nano-Satellite – Design, Construction, Launch And Early Operations Phase , C. Underwood, G. Richardson, J. Savignol
Snap-1: A Low Cost Modular Cots-Based Nano-Satellite – Design, Construction, Launch And Early Operations Phase , C. Underwood, G. Richardson, J. Savignol
Small Satellite Conference
Driven by the personal computer and personal communications markets, commercial-off-the-shelf (COTS) microelectronic systems have advanced considerably in the last few years, making it now feasible to construct highly capable “nano-satellites” (i.e. sub-10 kg satellites) to provide cost-effective and rapid-response, orbiting-test-vehicles for advanced space missions and technologies. The UK’s first nano-satellite: SNAP-1 - designed and built by Surrey Space Centre (SSC) and Surrey Satellite Technology Ltd (SSTL) staff - is an example of such a test-vehicle, in this case, built with the primary objective of demonstrating that a sophisticated, fully agile nano-satellite can be constructed rapidly, and at very low cost, …
A Ccsds Software System For A Single-Chip On-Board Computer Of A Small Satellite, Isabel Rutter, Tanya Vladimirova, Hans Tiggeler
A Ccsds Software System For A Single-Chip On-Board Computer Of A Small Satellite, Isabel Rutter, Tanya Vladimirova, Hans Tiggeler
Small Satellite Conference
The work presented in this paper is part of a Surrey Space Centre research project that aims to reduce the size of an on-board computer to a single chip facilitating further miniaturisation of small satellites. The paper is concerned with a communication system, specifically designed to meet the needs of a single-chip onboard computer - a simplified yet reliable and automated standalone alternative software implementation of the Consultative Committee of Space Data Systems (CCSDS) protocol communicating with a standard universal asynchronous receiver-transmitter (UART) peripheral. Details of the design and implementation stages of a CCSDS package coded in the language C …
Eastern Progress - 15 Aug 2001, Eastern Kentucky University
Eastern Progress - 15 Aug 2001, Eastern Kentucky University
Eastern Progress 2001-2002
No abstract provided.
Eng 1001g-011: Composition And Language, Christopher Hanlon
Eng 1001g-011: Composition And Language, Christopher Hanlon
Fall 2001
No abstract provided.
Eng 2003-002: Creative Writing: Poetry, Bruce Guernsey
Eng 2003-002: Creative Writing: Poetry, Bruce Guernsey
Fall 2001
No abstract provided.
Eng 3005-001-002: Technical Communication, Angela Vietto
Eng 3005-001-002: Technical Communication, Angela Vietto
Fall 2001
No abstract provided.
Eng 3001-006: Advanced Composition, John Moore
Eng 4300-003: English Senior Seminar: War Stories, Kilgore
Eng 4300-003: English Senior Seminar: War Stories, Kilgore
Fall 2001
No abstract provided.
People V. Koverman
Colorado Supreme Court Records and Briefs Collection
No abstract provided.
Eng 1001g-014-028-048: Composition And Language, Lucinda Berry
Eng 1001g-014-028-048: Composition And Language, Lucinda Berry
Fall 2001
No abstract provided.
Eng 1001g-049: Composition And Language, Susan Bazargan
Eng 1001g-049: Composition And Language, Susan Bazargan
Fall 2001
No abstract provided.
Eng 1002g-005: Composition And Literature, Tammy Veach
Eng 1002g-005: Composition And Literature, Tammy Veach
Fall 2001
No abstract provided.
Eng 1091g-095: Language And Composition (Honors), Fern Kory
Eng 1091g-095: Language And Composition (Honors), Fern Kory
Fall 2001
No abstract provided.