199
199
Jul 12, 2010
07/10
by
Kontaratos, A. N
texts
eye 199
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No Abstract Available
Topics: ACTUATION, APOLLO TELESCOPE MOUNT, GROUND BASED CONTROL, CIRCUIT DIAGRAMS, SYSTEMS ENGINEERING
235
235
Jul 12, 2010
07/10
by
Elber, W
texts
eye 235
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The statistical problems of airborne carbon fibers falling onto electrical circuits were idealized and analyzed. The probability of making contact between randomly oriented finite length fibers and sets of parallel conductors with various spacings and lengths was developed theoretically. The probability of multiple fibers joining to bridge a single gap between conductors, or forming continuous networks is included. From these theoretical considerations, practical statistical analyses to assess...
Topics: ELECTRON DENSITY PROFILES, GROUND BASED CONTROL, IONOSPHERIC SOUNDING, ELECTRON DISTRIBUTION,...
249
249
May 21, 2011
05/11
by
Kaufeler, J.-F.; Laue, H. A.; Poulter, K.; Smith, H
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eye 249
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Mission control systems supporting new space missions face ever-increasing requirements in terms of functionality, performance, reliability and efficiency. Modern data processing technology is providing the means to meet these requirements in new systems under development. During the past few years the European Space Operations Centre (ESOC) of the European Space Agency (ESA) has carried out a number of projects to demonstrate the feasibility of using advanced software technology, in...
Topics: GROUND BASED CONTROL, GROUND SUPPORT SYSTEMS, REMOTE SENSING, SPOT (FRENCH SATELLITE), DATA...
438
438
May 29, 2011
05/11
by
Seidel, Dave; Thompson, R. J.; Klipstein, W. M.; Kohel, J.; Maleki, L
texts
eye 438
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This paper presents the Laser Cooling and Atomic Physics (LCAP) program. It focuses on clock technology development. The topics include: 1) Overview of LCAP Flight Projects; 2) Space Clock 101; 3) Physics with Clocks in microgravity; 4) Space Clock Challenges; 5) LCAP Timeline; 6) International Space Station (ISS) Science Platforms; 7) ISS Express Rack; 8) Space Qualification of Components; 9) Laser Configuration; 10) Clock Rate Comparisons: GPS Carrier Phase Frequency Transfer; and 11) ISS...
Topics: CYBERNETICS, CONTROL SYSTEMS DESIGN, AUTOMATA THEORY, MODEL REFERENCE ADAPTIVE CONTROL, AUTONOMY,...
288
288
Jun 19, 2010
06/10
by
Feger, T
texts
eye 288
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Transmission of characteristic data and range measurement in air traffic control
Topics: AIR TRAFFIC CONTROL, DATA TRANSMISSION, GROUND BASED CONTROL, RANGEFINDING, AIR TRAFFIC CONTROL,...
CARTOSAT-1 RPCs need special handling. Absolute accuracy of uncontrolled scenes is poor (biases > 300 m). Noticeable cross-track scale error (+/- 3-4 m across stereo pair). Most errors are either biases or linear in line/sample (These are easier to correct with ground control).
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, ACCURACY, BIAS, ERRORS, DATA PRODUCTS,...
391
391
May 31, 2011
05/11
by
Hash, D. B.; Bose, D.; Rao, M. V. V. S.; Cruden, B. A.; Meyyappan, M.; Sharma, S. P
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eye 391
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Recently it has been recognized that the neutral gas in inductively coupled plasma reactors heats up significantly during processing. The resulting gas density variations across the reactor affect reaction rates, radical densities, plasma characteristics, and uniformity within the reactor. A self-consistent model that couples the plasma generation and transport to the gas flow and heating has been developed and used to study CF4 discharges. A Langmuir probe has been used to measure radial...
Topics: OZONE, RADIOSONDES, SOUTHERN HEMISPHERE, TOTAL OZONE MAPPING SPECTROMETER, TROPICAL REGIONS, KENYA,...
318
318
May 21, 2011
05/11
by
Bucher, Allen W
texts
eye 318
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VMPLOT is a versatile analysis tool designed by the Magellan Spacecraft Team to graphically display engineering data used to support mission operations. While there is nothing revolutionary or innovative about graphical data analysis tools, VMPLOT has some distinguishing features that set it apart from other custom or commercially available software packages. These features include the ability to utilize time in a Universal Time Coordinated (UTC) or Spacecraft Clock (SCLK) format as an...
Topics: EURECA (ESA), GROUND BASED CONTROL, GROUND SUPPORT SYSTEMS, SPACECRAFT COMMUNICATION, SPACECRAFT...
366
366
May 23, 2011
05/11
by
Lin, Chen; Evans, Harlan; Leblanc, Adrian D
texts
eye 366
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It is known that micro-gravity has a strong influence on the human musculoskeletal system. A number of studies have shown that significant changes in skeletal muscles occur in both space flight and bedrest simulation. In our 5 week bedrest study, the cross-sectional area of soleus-gastrocnemius decreased about 12 while the cross-sectional area of anterior calf muscles decreased about 4. Using volume measurements, these losses increased after 17 weeks to approximately 30 and 21 respectively....
Topics: AIR TRAFFIC CONTROL, DECISION SUPPORT SYSTEMS, GROUND BASED CONTROL, GRAPHICAL USER INTERFACE, COST...
267
267
May 21, 2011
05/11
by
Mizuta, Hiroshi; Martin, Daniel; Kato, Hatsuhiko; Ihara, Hirokaz
texts
eye 267
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This paper describes an application of the CCSDS Principle Network (CPH) service model to communications network elements of a postulated Integrated Ground Data System (IGDS). Functions are drawn principally from COSMICS (Cosmic Information and Control System), an integrated space control infrastructure, and the Earth Observing System Data and Information System (EOSDIS) Core System (ECS). From functional requirements, this paper derives a set of five communications network partitions which,...
Topics: DATA PROCESSING, DEEP SPACE NETWORK, GROUND BASED CONTROL, GROUND SUPPORT SYSTEMS, COMMAND AND...
758
758
May 22, 2011
05/11
by
Starrett, William David, Jr
texts
eye 758
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The final report for the Clearfield disassembly evaluation and a continuation of the KSC postflight assessment for the RSRM-28 (STS-53) RSRM flight set is presented. All observed hardware conditions were documented on PFOR's and are included in Appendices A through C. Appendices D and E contain the measurements and safety factor data for the nozzle and insulation components. This report, along with the KSC Ten-Day Postflight Hardware Evaluation Report (TWR-64215), represents a summary of the...
Topics: DATA TRANSFER (COMPUTERS), GROUND BASED CONTROL, PROTOCOL (COMPUTERS), SPACE COMMUNICATION,...
1,325
1.3K
Jul 12, 2010
07/10
by
Morrison, A. D
texts
eye 1,325
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The technology and economics of silicon ingot wafering for low cost solar arrays were discussed. Fixed and free abrasive sawing wire, ID, and multiblade sawing, materials, mechanisms, characterization, and innovative concepts were considered.
Topics: COCKPITS, CUES, FLIGHT SIMULATION, GROUND BASED CONTROL, HELICOPTER CONTROL, MOTION SIMULATORS,...
962
962
Jul 11, 2010
07/10
by
NON
texts
eye 962
favorite 0
comment 0
No Abstract Available
Topics: AIRCRAFT CONTROL, DESIGN ANALYSIS, FLIGHT SIMULATORS, GROUND BASED CONTROL, CONTROL STABILITY,...
Currently, most of the displays in control rooms can be categorized as status, alerts/procedures, or control screens. With the advent and use of CRTs and the associated computing power available to compute and display information, it is now possible to combine these different elements of information and control onto a single display. An experiment was conducted to determine which, if any, of these functions should be collocated in order to better handle simple anticipated non-normal system...
Topics: NASA Technical Reports Server (NTRS), DISPLAY DEVICES, GROUND BASED CONTROL, INTEGRATED MISSION...
425
425
Jul 11, 2010
07/10
by
Wingrove, R. C
texts
eye 425
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The estimation of longitudinal aerodynamic coefficients from data recorded during flight tests of a powered-lift STOL aircraft is considered. First, a comparison is made between the coefficient values determined by the regression and quasilinearization identification techniques from records taken during elevator pulse maneuvers. The results show that for these tests the regression method provides less scatter in coefficient estimates and provides better correlation with the predicted values....
Topics: AIRCRAFT GUIDANCE, AIRCRAFT LANDING, APPROACH CONTROL, INSTRUMENT LANDING SYSTEMS, GLIDE PATHS,...
494
494
May 23, 2011
05/11
by
Wang, W.; Takezawa, D.; Poovaiah, B. W
texts
eye 494
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A homologue of the multidrug resistance (MDR) gene was obtained while screening a potato stolon tip cDNA expression library with S-15-labeled calmodulin. The mammalian MDR gene codes for a membrane-bound P-glycoprotein (170-180 kDa) which imparts multidrug resistance to cancerous cells. The potato cDNA (PMDR1) codes for a polypeptide of 1313 amino acid residues (ca. 144 kDa) and its structural features are very similar to the MDR P-glycoprotein. The N-terminal half of the PMDR1-encoded protein...
Topics: TELEROBOTICS, ERRORS, ROBOT ARMS, TELEVISION CAMERAS, PREDICTIONS, REAL TIME OPERATION, SPACECRAFT...
Objective: Compare vendor-provided image coordinates with known references visible in the imagery. Approach: Use multiple, well-characterized sites with >40 ground control points (GCPs); sites that are a) Well distributed; b) Accurately surveyed; and c) Easily found in imagery. Perform independent assessments with independent teams. Each team has slightly different measurement techniques and data processing methods. NASA Stennis Space Center. South Dakota State University.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ACCURACY, IMAGERY, GROUND BASED CONTROL,...
216
216
Jun 9, 2011
06/11
by
Banks, Daniel W.; Blanchard, Robert C.; Miller, Geoffrey M
texts
eye 216
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A mobile, rapidly deployable ground-based system to track and image targets of aeronautical interest has been developed. Targets include reentering reusable launch vehicles as well as atmospheric and transatmospheric vehicles. The optics were designed to image targets in the visible and infrared wavelengths. To minimize acquisition cost and development time, the system uses commercially available hardware and software where possible. The conception and initial funding of this system originated...
Topics: GASES, TRANSONIC WIND TUNNELS, GROUND BASED CONTROL, WIND TUNNEL CALIBRATION, CONSTRUCTION,...
289
289
May 22, 2011
05/11
by
Remer, Donald S.; Sherif, Josef; Buchanan, Harry R
texts
eye 289
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This paper develops a cost model to do long range planning cost estimates for Deep Space Network (DSN) support of future space missions. The paper focuses on the costs required to modify and/or enhance the DSN to prepare for future space missions. The model is a function of eight major mission cost drivers and estimates both the total cost and the annual costs of a similar future space mission. The model is derived from actual cost data from three space missions: Voyager (Uranus), Voyager...
Topics: DATA TRANSMISSION, GROUND BASED CONTROL, PACKETS (COMMUNICATION), SPACECRAFT CONTROL, TELEMETRY,...
209
209
Jun 12, 2011
06/11
by
Cameron, A. G. W
texts
eye 209
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A recent remarkable discovery by Katharina Lodders showed that the abundances of extinct radioactivities (relative to reference nuclei) in chondrites, achondrites, and irons are proportional to the squares of their mean lives, whereas no such abundance-mean life relationship is apparent for the data of calcium-aluminum rich inclusions (CAIs) and a variety of other inclusion types. In this talk I shall interpret these results in terms of galactic and solar nebula processes. The first step in...
Topics: MARS ROVING VEHICLES, MISSION PLANNING, SCHEDULING, GROUND SUPPORT SYSTEMS, UNMANNED GROUND...
The Disaster Warning Satellite System is described. It will provide NOAA with an independent, mass communication system for the purpose of warning the public of impending disaster and issuing bulletins for corrective action to protect lives and property. The system consists of three major segments. The first segment is the network of state or regional offices that communicate with the central ground station; the second segment is the satellite that relays information from ground stations to...
Topics: NASA Technical Reports Server (NTRS), COMMUNICATION SATELLITES, DISASTERS, WARNING SYSTEMS, GROUND...
Topics discussed include: a) UAV s at NASA Dryden, Past and Present; b) Why Do We Flight Test?; c) The Blended (or Hybrid) Wing-Body Advantage; d) Program Objectives; e) The X-48B Vehicle and Ground Control Station; and f) Flight Test Highlights & Video.
Topics: NASA Technical Reports Server (NTRS), BLENDED-WING-BODY CONFIGURATIONS, GROUND BASED CONTROL,...
199
199
Jul 11, 2010
07/10
by
Gangi, A. F
texts
eye 199
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The data from the Apollo-14 and Apollo-16 Active Seismic Experiments were reanalyzed and show that a power-law velocity variation with depth is consistent with both the traveltimes and amplitudes of the first arrivals for source-to-geophone separations up to 32m. The data were improved by removing spurious glithches, flickering and stacking. While this improved the signal-to-noise ratios, it was not possible to measure the arrivals beyond 32m. The physical evidence that the shallow lunar...
Topics: ERYTHROCYTES, GROUND BASED CONTROL, LYMPH, EXOBIOLOGY, LYMPHOCYTES, PLASMOLYSIS, SINUSES,...
231
231
Jul 23, 2010
07/10
by
NON
texts
eye 231
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A compact hydride absorption refrigeration system with few moving parts for 10 Kelvin operation is disclosed and comprises liquid hydrogen producing means in combination with means for solidifying and subliming the liquid hydrogen produced. The liquid hydrogen is sublimed at about 10 Kelvin. By using a symmetrical all hydrogen redundant loop system, a 10 Kelvin refrigeration system can be operated for many years with only a fraction of the power required for prior art systems.
Topics: DESIGN ANALYSIS, FLIGHT MANAGEMENT SYSTEMS, FLIGHT PLANS, SYSTEMS ANALYSIS, COMPUTER PROGRAMS, COST...
265
265
Jul 11, 2010
07/10
by
GELPERIN, N. I.; AYNSHTEYN, V. G.; GELPERIN, E. N.; LVOVA, S. D
texts
eye 265
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THE HYDRODYNAMIC FEATURES OF GRANULAR MATERIALS IN THIS KIND OF EQUIPMENT, USING THREE QUARTZ SAND FRACTIONS AS THE GRANULAR MATERIAL AND SAND LAYER HEIGHTS OF 100, 150, 200, AND 250 MM. PROCESSES INVOLVING FLUIDIZED BEDS OF GRANULAR MATERIAL MAY BE BASED ON A CONICAL DIFFUSER AS WELL AS GAS-DISTRIBUTION GRIDS. IN THE FORMER CASE, WITH PROPER SELECTION OF CROSS-SECTIONAL AREA AND CONE APERTURE, THE DIFFUSORS AFFORD ADEQUATE PSEUDO-LIQUEFACTION (FLUIDIZATION) AND MAY BE USED SEPARATELY OR WITH A...
Topics: AIRCRAFT CONTROL, DIGITAL COMMAND SYSTEMS, REMOTE CONTROL, RESEARCH AIRCRAFT, DIGITAL COMPUTERS,...
399
399
May 22, 2011
05/11
by
Mueller, C.; Bater, R.; Sorensen, E. M
texts
eye 399
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The European Retrieval Carrier (EURECA) was launched on its first flight on the 31st July 1992 by the Space Shuttle Atlantis. EURECA is characterized by several new on-board features, most notable Packet Telemetry and a partial implementation of Packet Telecommanding using an early version of the Command Operation Procedure (COP-1) protocol. EURECA has also very low contact time with its Ground Station, with a consequent high number of out-of-visibility onboard operations. This paper...
Topics: ARTIFICIAL INTELLIGENCE, COLUMBUS SPACE STATION, MAN TENDED FREE FLYERS, MISSION PLANNING, SPACE...
230
230
May 29, 2011
05/11
by
Winder, Lee F.; Kuchar, James K
texts
eye 230
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The goal of the research was to develop formal guidelines for the design of hazard avoidance systems. An alerting system is automation designed to reduce the likelihood of undesirable outcomes that are due to rare failures in a human-controlled system. It accomplishes this by monitoring the system, and issuing warning messages to the human operators when thought necessary to head off a problem. On examination of existing and recently proposed logics for alerting it appears that few commonly...
Topics: HELICOPTERS, FLIGHT SIMULATION, MOTION SIMULATION, FLIGHT ENVELOPES, FLIGHT TESTS, HORIZONTAL...
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380
texts
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Studies are given for sizing and integrating a high energy upper stage restartable solid motor into a flight stage with various payloads for use with Titan 3 and Thor launch vehicles. Motor and stage configurations are given along with performance evaluation of the HEUS-RS with the space shuttle.
Topics: AIRPORTS, GROUND BASED CONTROL, LANDING AIDS, NAVIGATION AIDS, RUNWAYS, TERMINAL FACILITIES, VISUAL...
This document is a sequel to the report entitled Generic POCC Architectures, dated April 5, 1989, prepared by CTA under Contract NAS5-31500, Task 28-11600. That document presented a generic architecture based upon current technology, and a series of three refinements based on object-oriented analysis principles and expectations for POCC evolution. The current document revisits the object-oriented analysis of POCC's. We have reassessed the functional groupings that best adhere to object-oriented...
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, OBJECT-ORIENTED PROGRAMMING, PAYLOAD...
A computer system is reported that effectively schedules complex mission support by processing spacecraft requirements, station capabilities, and ephemeris data in teletype format ready for transmission.
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, GROUND SUPPORT SYSTEMS, MISSION...
Digital Globe provides for general use 2.4 m multi-spectral and 0.7 m panchromatic imagery acquired by the Quickbird satellite. This geometrically corrected imagery was obtained as standard and orthorectified products; the difference between the two products is primarily in the degree of geometric accuracy that Digital Globe claims. For both products, every image pixel contains estimated sets of Northing/Easting and lat/long coordinates accessible through an image display application such as...
Topics: NASA Technical Reports Server (NTRS), GEOMETRIC ACCURACY, IMAGERY, COORDINATES, ESTIMATING, GROUND...
Operation of a navigation system, centered around image correction, was simulated and the system performance was analyzed. Onboard utilization of ground control points for image correction is summarized. Simulation results, and recommendations for future mission requirements are presented.
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, IMAGE PROCESSING, REMOTE SENSING,...
Training of ground control teams has been a difficult task in space operations. There are several intangible skills that must be learned to become the steely eyed men and women of mission control who respond to spacecraft failures that can lead to loss of vehicle or crew if handled improperly. And as difficult as training is, it can also be costly. Every day, month or year an operator is in training, is a day that not only they are being trained without direct benefit to the organization, but...
Topics: NASA Technical Reports Server (NTRS), CERTIFICATION, EDUCATION, FLIGHT CONTROL, GROUND BASED...
287
287
May 22, 2011
05/11
by
Saxon, J. B
texts
eye 287
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Structural analysis of piping systems, especially dynamic analysis, typically considers the duct structure and the contained fluid column separately. Coupling of these two systems, however, forms a new dynamic system with characteristics not necessarily described by the superposition of the two component system's characteristics. Methods for modeling the two coupled components simultaneously using finite line elements are presented. Techniques for general duct intersections, area or direction...
Topics: ARTIFICIAL SATELLITES, COMPUTERIZED SIMULATION, OBJECT-ORIENTED PROGRAMMING, REAL TIME OPERATION,...
Details of medical research and development programs, particularly an integrated medical laboratory, as derived from space technology are given. The program covers digital biotelemetry systems, automatic visual field mapping equipment, sponge electrode caps for clinical electroencephalograms, and advanced respiratory analysis equipment. The possibility of using the medical laboratory in ground based remote areas and regional health care facilities, as well as long duration space missions is...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENGINEERING, GROUND BASED CONTROL, MEDICAL...
274
274
Jun 15, 2011
06/11
by
Robbins, R
texts
eye 274
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An interactive graphics system conceived to be used in the design, analysis, and manufacturing of aircraft components with free form surfaces was described. In addition to the basic surface definition and viewing capabilities inherent in such a system, numerous other features are present: surface editing, automated smoothing of control curves, variable milling patch boundary definitions, surface intersection definition and viewing, automatic creation of true offset surfaces, digitizer and...
Topics: COCKPITS, REAL TIME OPERATION, TELEMETRY, COMPUTER GRAPHICS, DISPLAY DEVICES, GROUND BASED CONTROL,...
The Unified Modeling Language (UML) is the standard method for specifying, visualizing, and documenting the artifacts of an object-oriented system under development. UML is the unification of the object-oriented methods developed by Grady Booch and James Rumbaugh, and of the Use Case Model developed by Ivar Jacobson. This paper discusses the application of UML by the Communications and Data Systems (CDS) team to model the ground control and command of the Space Station Biological Research...
Topics: NASA Technical Reports Server (NTRS), OBJECT-ORIENTED PROGRAMMING, TELECOMMUNICATION, DATA SYSTEMS,...
334
334
Jun 13, 2011
06/11
by
Burian, Barbara K.; Barshi, Immanuel; Dismukes, Ke
texts
eye 334
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Emergency and abnormal situations occur on flights everyday around the world. They range from minor situations readily managed to extremely serious and highly time-critical situations that deeply challenge the skills of even the most effective crews. How well crews respond to these situations is a function of several interacting sets of issues: (1) the design of non-normal procedures and checklists, (2) design of aircraft systems and automation, (3) specific aspects of the non-normal situation,...
Topics: AIRCRAFT SAFETY, OPERATIONS RESEARCH, GROUND BASED CONTROL, PILOTLESS AIRCRAFT, FLIGHT...
Work associated with contract provided support for the approved flight experiment 'Crystal Growth of Selected 2-6 Semiconducting Alloys by Directional Solidification.' General activities included ground-based melt studies, compositional and microstructure characterization of the grown crystals, and participation in the continuing assessment of the program. Specifically, work was performed to determine the optimum furnace translation rate at which a HgZnTe sample could be removed from the...
Topics: NASA Technical Reports Server (NTRS), AMPOULES, CRYSTAL GROWTH, DIRECTIONAL SOLIDIFICATION...
SPOT sun-synchronous remote sensing satellites are operated by CNES since February 1986. Today, the SPOT mission and control center (CCM) operates SPOT1, SPOT2, and is ready to operate SPOT3. During these seven years, the way to operate changed and the CCM, initially designed for the control of one satellite, has been modified and upgraded to support these new operating modes. All these events have shown the performances and the limits of the system. A new generation of satellite (SPOT4) will...
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, GROUND SUPPORT SYSTEMS, REMOTE SENSING,...
Laser ranging is expected to help unlock the mysteries of the earthquake phenomenon by producing unique results of crustal motions of the Earth. The current state of the art and future projections are presented, including principal applications and characteristics of typical systems.
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, LASER RANGER/TRACKER, SATELLITE-BORNE...
An approach to remote sensing that meets future mission requirements was investigated. The deterministic acquisition of data and the rapid correction of data for radiometric effects and image distortions are the most critical limitations of remote sensing. The following topics are discussed: onboard image correction systems, GCP navigation system simulation, GCP analysis, and image correction analysis measurement.
Topics: NASA Technical Reports Server (NTRS), DATA ACQUISITION, GLOBAL POSITIONING SYSTEM, GROUND BASED...
In order to minimize the effects of parameter variations in the dynamics of an optical tracking telescope, a model referenced parameter adaptive control system is described that - in conjunction with more traditional forms of compensation - achieves a reduction of rms pointing error by more than a factor of six. The adaptive compensation system utilizes open loop compensation, closed loop compensation, and model reference compensation to provide the precise input to force telescope axis...
Topics: NASA Technical Reports Server (NTRS), COMPENSATORY TRACKING, POINTING CONTROL SYSTEMS, SELF...
NASA Headquarters' Office of Advanced Concepts and Technology (OACT) joined efforts with Johnson Space Center's (JSC) Automation and Robotics Division and Langley Research Center's (LaRC) Information Systems Division to capture the technologies developed during the cancelled NASA Flight Telerobotic Servicer (FTS) program planned for use on Space Station Freedom. The recent FTS technology capture effort completed the build and testing of one flight qualifiable FTS manipulator, deliverable to...
Topics: NASA Technical Reports Server (NTRS), MANIPULATORS, ORBITAL SERVICING, SERVICE LIFE, TELEROBOTICS,...
This viewgraph presentation provides information on the development of a portal to provide secure and distributed grid computing for Payload Operations Integrated Center and Mission Control Center ground services.
Topics: NASA Technical Reports Server (NTRS), INTEGRATED MISSION CONTROL CENTER, GRID COMPUTING (COMPUTER...
Video data from the Earth Resources Technology Satellite (ERTS) are entered into the initial image generation system and placed on film using an electron beam to correct for both radiometric and geometric errors, a hardware unit called EBRIC was designed, fabricated, and incorporated in the image processing system. It operates under the control of a process control computer, as it varies video signal and the x and y deflection signals of the EBR.
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, ERROR CORRECTING DEVICES, IMAGE...
At the Kennedy Space Center, I engaged in the research and development of electrical ground support equipment for NASA's Constellation Program. Timing characteristics playa crucial role in ground support communications. Latency and jitter are two problems that must be understood so that communications are timely and consistent within the Kennedy Ground Control System (KGCS). I conducted latency and jitter tests using Alien-Bradley programmable logic controllers (PLCs) so that these two...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC EQUIPMENT, GROUND SUPPORT EQUIPMENT, EDUCATION,...
In the context of the CNES SPOT4 program CISI is particularly responsible for the development of the SPOT4 Management Centre, part of the SPOT4 ground control system located at CNES Toulouse (France) designed to provide simultaneous control over two satellites. The main operational activities are timed to synchronize with satellite visibilities (ten usable passes per day). The automatic capability of this system is achieved through agenda services (sequence of operations as defined and planned...
Topics: NASA Technical Reports Server (NTRS), GROUND BASED CONTROL, MANAGEMENT SYSTEMS, PERSONNEL...
An attitude computation facility for the control of unmanned satellite missions is reported. The system's major components include: the ability to transfer the attitude data from the control center to the attitude computer at a rate of 2400 bps; an attitude computation center which houses communications, closed circuit TV, graphics devices and a data evaluation area; and the use of interactive graphics devices to schedule jobs and to control program flow.
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, GROUND BASED CONTROL, SATELLITE ATTITUDE...
Although high altitude frequencies effects are removed at the time of basic image generation, low altitude (Yaw) effects are still present in form of affinity/angular affinity. They are effectively removed by additional parameters. Bundle block adjustment based on properly weighted ephemeris/altitude quaternions (BBABEQ) are not enough to remove the systematic effect. Moreover, due to the narrow FOV of the HRSI, position and altitude are highly correlated making it almost impossible to separate...
Topics: NASA Technical Reports Server (NTRS), SYSTEMATIC ERRORS, ACCURACY, QUATERNIONS, YAW, HIGH ALTITUDE,...
