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Articles 2611 - 2640 of 13205
Full-Text Articles in Entire DC Network
An Attitude Control System For A Low-Cost Earth Observation Satellite With Orbit Maintenance Capability , Willem Steyn, Yoshi Hashida
An Attitude Control System For A Low-Cost Earth Observation Satellite With Orbit Maintenance Capability , Willem Steyn, Yoshi Hashida
Small Satellite Conference
UoSAT-12 is a low-cost minisatellite built by Surrey Satellite Technology Ltd. (SSTL), it is amongst other objectives also a technology demonstrator for high performance attitude control and orbit maintenance on a future constellation of earth observation satellites. The satellite uses a 3-axis reaction wheel configuration and a cold gas propulsion system to enable precise and fast control of its attitude, for example, during orbit manoeuvres. Magnetorquer coils assist the wheels mainly for momentum dumping. This paper describes the various attitude control modes required to support: 1) the initial attitude acquisition phase, 2) a high resolution imager payload during pointing and …
New Approach To Achieving Stand Alone Gps Attitude Determination Using Dual Short Baselines For Small-Satellite , S. Purivigraipong, M. S. Hodgart, Y. Hashida, M. J. Unwin
New Approach To Achieving Stand Alone Gps Attitude Determination Using Dual Short Baselines For Small-Satellite , S. Purivigraipong, M. S. Hodgart, Y. Hashida, M. J. Unwin
Small Satellite Conference
This paper proposes a new approach to GPS (Global Positioning System) attitude determination for small satellite application in LEO (low Earth orbit). Prior knowledge of attitude and integer resolution is not required. The methodology of the new approach includes integer ambiguity search, initial estimation of attitude and line bias, attitude initialisation, path difference estimation and fine attitude determination. The observable is the carrier phase difference measurement between two GPS antennas. A dual short baseline (typical baseline length up to 30 cm) is assumed in this research. The key point to initialising attitude is to estimated the attitude of individual baseline …
Eastern Progress - 26 Aug 1999, Eastern Kentucky University
Eastern Progress - 26 Aug 1999, Eastern Kentucky University
Eastern Progress 1999-2000
No abstract provided.
Lanthorn, Vol. 34, No. 01, August 26, 1999, Grand Valley State University
Lanthorn, Vol. 34, No. 01, August 26, 1999, Grand Valley State University
Volume 34, August 26, 1999 - April 20, 2000
Lanthorn is Grand Valley State's student newspaper, published from 1968 to the present.
08/26/1999 Obituary Records, Hawaii Obituaries
08/26/1999 Obituary Records, Hawaii Obituaries
Obituaries
List of Obituaries for individuals who passed away on 08/26/1999. Scroll down to see the names and obituary description.
The Setonian, August 26, 1999, Seton Hall University
Piersma, Grace Oral History Interview: Business And Industry In Holland, Anna Holt
Piersma, Grace Oral History Interview: Business And Industry In Holland, Anna Holt
Business and Industry in Holland
No abstract provided.
College Voice Vol. 23 No. 1, Connecticut College
Summer Mustang, August 26, 1999
Summer Mustang, August 26, 1999
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
The Bg News August 26, 1999, Bowling Green State University
The Bg News August 26, 1999, Bowling Green State University
BG News (Student Newspaper)
The BGSU campus student newspaper. August 26, 1999. Volume 84-Issue 3.
August 26, 1999, The Daily Mississippian
August 26, 1999, The Daily Mississippian
Daily Mississippian (all digitized issues)
No abstract provided.
Washington University Record, August 26, 1999
Washington University Record, August 26, 1999
Washington University Record
No abstract provided.
Progress Towards Fedsat 2001 A'Stralian Space Odyssey, Stephen Russell, Mirek Vesely, Chris Graham, Mike Petkovic
Progress Towards Fedsat 2001 A'Stralian Space Odyssey, Stephen Russell, Mirek Vesely, Chris Graham, Mike Petkovic
Small Satellite Conference
In mid-1997, the Australian Government approved the setting up of a Cooperative Research Centre for Satellite Systems (CRCSS) to promote Australian space research. A key outcome of the research activities is intended to be the launching of a research satellite - FedSat- by the year 2001, the centenary year of Australian Federation. This will be the first Australian built satellite since 1970, and vital a step towards Australia's reentry into the satellite business. This talk describes the aims of the FedSat mission; the design of the overall system; and provides up-to-date details of progress towards project completion.
Bird - A Microsatellite For Hot Spot Detection, I. Waiter, K. Brieß, B. Heym, W. Bärwald, F. Lura, H. Studemund
Bird - A Microsatellite For Hot Spot Detection, I. Waiter, K. Brieß, B. Heym, W. Bärwald, F. Lura, H. Studemund
Small Satellite Conference
The BIRD mission of the German Aerospace Centre shall demonstrate the scientific and technological value and the technical and programmatic feasibility of a remote sensing small satellite mission under low budget constraints. The payload -a new generation of cooled infrared detectors- is adapted to the mission objective - the investigation of hot spots caused by forest fires or volcanic activities completed by the diagnosis of vegetation conditions and changes. BIRD -the Bispectral Infra-Red Detector- is a three-axis stabilised spacecraft within a volume of 0.21 m3 and a mass of 88 kg. In flight configuration with one fixed and two deployed …
Tsinghua Micro/Nanosatellite Research And Its Application, You Zheng, Gong Ke, M. Sweeting
Tsinghua Micro/Nanosatellite Research And Its Application, You Zheng, Gong Ke, M. Sweeting
Small Satellite Conference
With the development of Micro-lNano-technology, Micro-lNano-satellite are paid great attention and developed rapidly. Tsinghua Space Research Center( TSRC) has planed to develop their Microsatellite and Nanosatellite with the cooperation of Surrey Space Center (SSC). The Tsinghua-l Microsatellite is new generation 3-axis stabile Microsatellite in 50 Kg. It is used as technical demonstration of Microsatellite constellation for globe disaster forecast net. The main Payloads include Multi-Spectral Earth Image System (MEIS) which have a 50 meters ground resolution and the cameras will be mounted 15 degrees off Z-axis of the satellite to meet the 400 kilometre ground swath requirement, Date Transmit Experiment …
The Florida Space Institute's Photon Satellite Bus, Derek Shannon, Chrishma Singh-Derewa, Sanjay Jayaram
The Florida Space Institute's Photon Satellite Bus, Derek Shannon, Chrishma Singh-Derewa, Sanjay Jayaram
Small Satellite Conference
Photon is a small satellite for researching atmospheric effects on Earth-to-space laser propagation and the mitigation of those effects. Florida Space Institute engineers and scientists are designing the science mission and payload, while FSI students are responsible for the satellite bus. An agreement with NASA for a free launch aboard the Space Shuttle's Hitchhiker Ejection System has led to a unique, bottomup design approach. Science goals and stringent safety requirements have created interesting challenges for the structure, thermal, attitude control, and power subsystems. This paper emphasizes these challenges in presenting the design of the Photon satellite bus.
Operations Planning And Formation Flying: Analyzing Resource Usage In Formation Assembly , Brian Engberg
Operations Planning And Formation Flying: Analyzing Resource Usage In Formation Assembly , Brian Engberg
Small Satellite Conference
Increasing interest in small spacecraft has fostered a variety of new mission concepts. Within this busy framework, one particular family of mission concepts is taking shape - spacecraft formations. Formation flying entails the organized collection of satellites in a region of space to do a certain job. Missions of this kind pose some interesting design challenges. Most notably, active control of a formation is a fairly popular topic. The aim of s.uch research is to devise a means of stabilizing a loosely bound system while conserving valuable resources. Another area, which seems to be lagging in attention, is the area …
Pre-Flight Characteristics Of The U.S. Air Force Academy's Falconsat-1, Raja Chari
Pre-Flight Characteristics Of The U.S. Air Force Academy's Falconsat-1, Raja Chari
Small Satellite Conference
FalconSat-l is the first of a series of small satellites being designed, built, and operated by cadets at the U.S. Air Force Academy. FalconSat-1 's primary mission is to carry the Charging Hazard and Wake Studies-Long Duration (CHAWS-LD) space physics experiment. This mission is accomplished by cadets from various academic departments working with faculty mentors and experts from industry and other universities. The culmination of this work will come on 15 Sep 99, when FalconSat-1 is lifted into a nearly sun-synchronous orbit atop the Air Force's new Minotaur launch vehicle. This paper summarizes the design of each major subsystem. The …
Wittex: A Constellation Of Three Small Satellite Radar Altimeters, Keith Raney, Glen Fountain, Robert Gold, Ark Lew, David Porter
Wittex: A Constellation Of Three Small Satellite Radar Altimeters, Keith Raney, Glen Fountain, Robert Gold, Ark Lew, David Porter
Small Satellite Conference
WITTEX, named in honor of E. Witte, who in 1878 first discovered the geostrophic current equation, is an acronym for Water Inclination Topography and Technology Experiment. WITTEX consists of three co-planar small satellite radar altimeters launched on the same vehicle into a GEOSAT -class orbit. The proposed satellite constellation would support measurement for the first time of both orthogonal components of the ocean's surface slope, rather than the single component seen by conventional instruments. The satellites are spaced by several kilometers along their orbit; Earth rotation causes their sub-satellite tracks to be laterally separated. Track separation can be readily adjusted …
Mars Micromissions, Steve Matousek, Kim Leschly, Bob Gershman, John Reimer
Mars Micromissions, Steve Matousek, Kim Leschly, Bob Gershman, John Reimer
Small Satellite Conference
A Mars micromission launches as an Ariane 5 secondary as early as November I, 2002. One possible mission is a Comm/nav micromission .orbiter. The other possible mission is a Mars airplane. Both missions are enabled by a lowcost, common micromisson bus design. The future of Mars micromissions has at least two micromissions per Mars Opportunity In cooperation with CNES. Other destinations besides Mars are possible by small changes and technology Infusion in the micromission system design detailed here. Micromissions enable a new class of science investigations and comm/nav orbiters due to low-cost, focused design.
Design Of Simple Low-Cost Mars Microlander, Tomas Svitek
Design Of Simple Low-Cost Mars Microlander, Tomas Svitek
Small Satellite Conference
This paper describes the development of a simple low-cost Mars microlander that is matched to the capabilities of the recently-approved Mars Micromission program. This particular microlander design is intended to fill a capability gap between two existing landing systems: the large sophisticated soft landers like Mars Polar Lander and the miniaturized DS-2-class penetrators. This microlander would be able to deliver (in a controlled manner) a small but sophisticated science payload to multiple, exciting but risky landing sites (as an example for our point design, we have used the delivery of the 60% scale Sojourner-class minirover). The unique attribute of this …
Novel Missions For Next Generation Microsatellites: The Results Of A Joint Afrl/Jpl Study, Ruth Moser, David Collins, Alok Das, Robert Ferber, George Jaivin, Richard Madison, Joseph Smith, Michael Stallard
Novel Missions For Next Generation Microsatellites: The Results Of A Joint Afrl/Jpl Study, Ruth Moser, David Collins, Alok Das, Robert Ferber, George Jaivin, Richard Madison, Joseph Smith, Michael Stallard
Small Satellite Conference
The development of technologies for miniature, low-mass, high density components and of systems that efficiently utilize these teclmologies has enabled a path to the next generation of highly capable microsatellites in the range of 10 - 100-kg. The characteristics and capabilities of this emerging class of satellites are briefly described. These satellites have the potential for revolutionizing space missions owing to their small size, low cost, significant capability, and good return on investment. This paper documents conceptual microsatellite mission scenarios examined in a collaborative effort between the Air Force Research Laboratory (AFRL) and the Jet Propulsion Laboratory of the California …
Arbiter, August 25, Students Of Boise State University
Arbiter, August 25, Students Of Boise State University
Student Newspapers
No abstract provided.
The Quality Of Researchers' Searches Of The Eric Database, Scott Hertzberg, Lawrence Rudner
The Quality Of Researchers' Searches Of The Eric Database, Scott Hertzberg, Lawrence Rudner
Education Policy Analysis Archives (EPAA)
During the last ten years, end-users of electronic databases have become progressively less dependent on librarians and other intermediaries. This is certainly the case with the Educational Resources Information Center (ERIC) Database, a resource once accessed by passing a paper query form to a librarian and now increasingly searched directly by end-users. This article empirically examines the search strategies currently being used by researchers and other groups. College professors and educational researchers appear to be doing a better job searching the database than other ERIC patrons. However, the study suggests that most end-users should be using much better search strategies.
Noorily V. Thomas & Betts Corp.
Education Policy Analysis Archives 07/25 , Arizona State University, University Of South Florida
Education Policy Analysis Archives 07/25 , Arizona State University, University Of South Florida
College of Education Publications
Quality of researchers' searches of the ERIC database / Scott Hertzberg [and] Lawrence Rudner.
Daily Eastern News: August 25, 1999, Eastern Illinois University
Daily Eastern News: August 25, 1999, Eastern Illinois University
August
No abstract provided.
Timetable Of Classes, Fall/Spring 1999-2000, University Of Alabama In Huntsville
Timetable Of Classes, Fall/Spring 1999-2000, University Of Alabama In Huntsville
Course Schedules
No abstract provided.