245
245
Jun 17, 2010
06/10
by
Gillespie, W., Jr
texts
eye 245
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No Abstract Available
Topics: COMMUNICATION SATELLITES, ECHOES, SUPERHIGH FREQUENCIES, ULTRAHIGH FREQUENCIES
165
165
May 6, 2010
05/10
by
Kay, R. E
texts
eye 165
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Detection of protein in trace amounts by j-band analysis
Topics: GELATINS, PH FACTOR, PROTEINS, SUPERHIGH FREQUENCIES, J-BAND, PROTEIN
203
203
Jul 12, 2010
07/10
by
Miller, L. G
texts
eye 203
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comment 0
No Abstract Available
Topics: DEPTH MEASUREMENT, LUNAR SURFACE, SURFACE LAYERS, LANDING RADAR, RADAR, SUPERHIGH FREQUENCIES
210
210
Jun 21, 2010
06/10
by
NON
texts
eye 210
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Low-rate command data link performance, serial orthogonal decoder analysis, and optimal codes and strong converse for transmission over noisy memoryless channels
Topics: AMPLIFIERS, ELECTROSTATICS, RADIANT COOLING, ACCUMULATORS, KLYSTRONS, SPACECRAFT COMMUNICATION,...
346
346
Jul 11, 2010
07/10
by
Williamson, F. S. L
texts
eye 346
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A classification system for Chesapeake Bay wetlands was derived from the correlation of film density classes and actual vegetation classes. The data processing programs used were developed by the Laboratory for the Applications of Remote Sensing. These programs were tested for their value in classifying natural vegetation, using digitized data from small scale aerial photography. Existing imagery and the vegetation map of Farm Creek Marsh were used to determine the optimal number of classes,...
Topics: CYCLOTRON RESONANCE, MASERS, MILLIMETER WAVES, SUBMILLIMETER WAVES, COHERENT RADIATION,...
244
244
May 24, 2011
05/11
by
Dibb, J. E.; Talbot, R. W.; Lefer, B. L.; Scheuer, E.; Gregory, G. L.; Browell, E. V.; Bradshaw, J. D.; Sandholm, S. T.; Singh, H. B
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eye 244
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Aerosol sampling for the determination of the concentrations of soluble ionic species and the natural radionuclides Be-7 and Pb-210 was conducted from the NASA DC-8 over the western Pacific as part of GTE/PEM-West B during February - March 1994. Concentrations of most soluble ionic species in the free troposphere were higher in samples collected on flights originating from Hong Kong and Japan than those collected further east over the open ocean. In both regions the measured concentrations were...
Topics: ELECTROMAGNETIC INTERFERENCE, SPREAD SPECTRUM TRANSMISSION, RADIO RECEIVERS, ULTRAHIGH FREQUENCIES,...
677
677
Jun 21, 2010
06/10
by
Colombo, R. M.; Murrin, T. A.; Taylor, W. E
texts
eye 677
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Systematic two dimensional cascade tests - multiple circular-arc hydrofoils
Topics: DEEP SPACE INSTRUMENTATION FACILITY, SPECTRUM ANALYSIS, TELECOMMUNICATION, COMPATIBILITY, RADIO...
357
357
May 23, 2011
05/11
by
Coppenbarger, Richard A
texts
eye 357
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Helmet-mounted display (HMD) symbology for an automated Nap-of-the-Earth (NOE) guidance and control system is described. In the automated system, referred to as Pilot-Directed Guidance (PDG), pilot control inputs are interpreted as high-level velocity commands to an inner-loop guidance and control system that is responsible for obstacle detection and avoidance maneuvering. The success of the PDG concept has been shown to be highly dependent upon the intelligent use of inertially stabilized...
Topics: RADOME MATERIALS, TRANSMISSION LOSS, MILLIMETER WAVES, PERMITTIVITY, FREQUENCY RANGES, INCIDENCE,...
419
419
May 29, 2011
05/11
by
Buck, Gregory M
texts
eye 419
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High-temperature luminescent coatings are being developed and applied for simultaneous pressure and temperature mapping in conventional-type hypersonic wind tunnels, providing global pressure as well as Global aeroheating measurements. Together, with advanced model fabrication and analysis methods, these techniques will provide a more rapid and complete experimental aerodynamic and aerothermodynamic database for future aerospace vehicles. The current status in development of simultaneous...
Topics: ETCHING, INDUCTORS, INTEGRATED CIRCUITS, MICROWAVE CIRCUITS, Q FACTORS, RESONANT FREQUENCIES,...
220
220
Jul 10, 2010
07/10
by
KASTLER, A
texts
eye 220
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IT IS DEMONSTRATED THAT THE ELECTRONIC MAGNETIC RESONANCE OF PARAMAGNETIC IONS PRODUCED BY A HIGH FREQUENCY MAGNETIC FIELD IN THE PRESENCE OF A CONSTANT FIELD MUST INFLUENCE THE MAGNETIC ROTARY POLARIZATION OF THESE IONS OBSERVED WITH A VISIBLE RADIATION.
Topics: AFRICA, ANTARCTIC REGIONS, COSMOS SATELLITES, RADIATION MEASUREMENT, BRIGHTNESS TEMPERATURE, EARTH...
The Link Module described in this paper was first developed for the NASA Global Hawk Pacific Mission (GloPAC), four flights of 30 hour duration, supporting the Aura Validation Experiment (AVE). Its second use was during the Genesis and Rapid Intensification Processes (GRIP) experiment, a NASA Earth Science field experiment to better understand how tropical storms form and develop into major hurricanes. In these missions, the Link module negotiated all communication over the high bandwidth Ku...
Topics: NASA Technical Reports Server (NTRS), DATA LINKS, COMMUNICATION NETWORKS, SUPERHIGH FREQUENCIES,...
522
522
May 24, 2011
05/11
by
Wilcox, William R.; Regel, Liya L.; Smith, Reginald W
texts
eye 522
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This grant began in June of 1996. Its long term goal is to be able to control the microstructure of directionally solidified eutectic alloys, through an improved understanding of the influence of convection. The primary objective of the present projects is to test hypotheses for the reported influence of microgravity on the microstructure of three fibrous eutectics (MnBi-Bi, InSb-NiSb, Al3Ni-Al). A secondary objective is to determine the influence of convection on the microstructure of other...
Topics: AUSTIN COMET, BRORSEN-METCALF COMET, DISSOCIATION, HYDROGEN SULFIDE, EMISSION SPECTRA, SOLAR...
309
309
Jun 27, 2010
06/10
by
Krupenio, N. N., et al
texts
eye 309
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Mean quadratic angles of inclination of surfaces on Venus with diagrams of backscatter measured by radio waves
Topics: ANTENNA DESIGN, MARINER VENUS-MERCURY 1973, VELOCITY MEASUREMENT, HORN ANTENNAS, SUPERHIGH...
730
730
Jul 12, 2010
07/10
by
Hawkins, J. E
texts
eye 730
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A 0.15 scale model of a proposed conformal variable-ramp inlet for the Multirole Fighter was tested from Mach 0.8 to 2.2 at a wide range of angles of attack and sideslip. Inlet ramp angle was varied to optimize ramp angle as a function of engine airflow, Mach number, angle of attack, and angle of sideslip. Several inlet configuration options were investigated to study their effects on inlet operation and to establish the final flight configuration. These variations were cowl sidewall cutback,...
Topics: ANTENNA RADIATION PATTERNS, BORESIGHT ERROR, ERROR ANALYSIS, PARABOLIC ANTENNAS, ATTENUATORS,...
The design, build, and test of an engineering breadboard Ku band quadraphase shift keyed and wideband frequency modulated transmitter are described. This orbiter Ku band transmitter drawer is to simulate the orbiter transmitter and meet the functional requirements of the orbiter communication link.
Topics: NASA Technical Reports Server (NTRS), SUPERHIGH FREQUENCIES, TELECOMMUNICATION, TRANSMITTERS,...
262
262
May 23, 2011
05/11
by
Ristorcelli, J. R
texts
eye 262
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A simple parameterization scheme for a complex turbulent flow using nondimensional parameters coming from the Reynolds stress equations is given. Definitions and brief descriptions of the physical significance of several nondimensional parameters that are used to characterize turbulence from the viewpoint of single-point turbulence closures are given. These nondimensional parameters reflect measures of (1) the spectral band width of the turbulence; (2) deviations from the ideal Kolmogorov...
Topics: ANTENNA ARRAYS, THESES, TELEVISION SYSTEMS, AMPLIFICATION, ANTENNA DESIGN, MICROSTRIP ANTENNAS,...
373
373
Jul 10, 2010
07/10
by
GOLIKOV, S. N
texts
eye 373
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DATA SYSTEMIZATION OF TOXICOLOGICAL PATHOPHYSIOLOGY EXOGENIC INTOXICATORS WAS STUDIED USING MODERN CONCEPTS AND MECHANISMS WHICH DEFINE THE ACTION OF VARIOUS POISONS. CHARACTERISTICS, SYMPTOMS, SYNDROMES, TREATMENT, AND PREVENTION WERE CONSIDERED IN ADDITION TO THE EXTREMAL STATES OF SHOCK, COLLAPSE, COMA, AND AGONY.
Topics: MOISTURE CONTENT, RADIO ASTRONOMY, SPACE PROBES, VENUS ATMOSPHERE, ABSORPTION SPECTRA, CARBON...
194
194
Jul 11, 2010
07/10
by
KURCHEYEVA, I. V
texts
eye 194
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TO CONSTRUCT PERIODIC SOLUTIONS IN A LIMITED PROBLEM OF THREE BODIES, THE POINCARE SMALL PARAMETER METHOD IS USED. A NEW SYSTEM IS GIVEN WHICH IS CALLED GENERATIVE, THAT ADMITS PERIODIC SOLUTIONS. IN FULFILLING SEVERAL CONDITIONS, ONE AND ONLY ONE PERIODIC SOLUTION OF THE PRIMARY SYSTEM WILL SATISFY THE PERIODIC SOLUTION OF THE GENERATIVE SYSTEM.
Topics: ELECTRICAL PROPERTIES, SPACE SHUTTLES, SPACECRAFT ANTENNAS, THERMAL RESISTANCE, ANTENNA RADIATION...
469
469
Jul 12, 2010
07/10
by
Ramanathan, V.; Weast, T. E.; Ananth, K. P
texts
eye 469
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The viability of using fluidized bed heat exchangers (FBHX) for thermal energy storage (TES) in applications with potential for waste heat recovery was investigated. Of the candidate applications screened, cement plant rotary kilns and steel plant electric arc furnaces were identified, via the chosen selection criteria, as having the best potential for successful use of FBHX/TES system. A computer model of the FBHX/TES systems was developed and the technical feasibility of the two selected...
Topics: PARABOLIC REFLECTORS, STRUCTURAL WEIGHT, WIND VELOCITY, ANTENNA DESIGN, MICROWAVE ANTENNAS, SOLAR...
227
227
May 24, 2011
05/11
by
Helfenstein, Pau
texts
eye 227
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The objective of this research is to investigate how the spectrophotometric properties of planetary surface materials depend on photometric geometry by refining and applying radiative transfer theory to data obtained from spacecraft and telescope observations of planetary surfaces, studies of laboratory analogs, and computer simulations. The goal is to perfect the physical interpretation of photometric parameters in the context of planetary surface geological properties and processes. The...
Topics: OSCILLATOR STRENGTHS, ELECTRON STATES, ENERGY BANDS, CARBON MONOXIDE, ABSORPTION SPECTRA,...
793
793
Sep 20, 2010
09/10
by
Shelley, Richard; Ross, William L., Sr
texts
eye 793
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The Auxiliary Power Unit (APU) fuel (hydrazine) tanks were removed from the Columbia Shuttle during major modification of the vehicle, because of long-term hydrazine compatibility concerns. The three tanks had been in service for 11 years. As part of an effort to determine whether the useful life of the fuel tanks can be extended, examination of the ethylene propylene rubber (EPR) diaphragm and the metal casing from one of the APU tanks was required. NASA Johnson Space Center Propulsion and...
Topics: ANTENNA ARRAYS, ANTENNA RADIATION PATTERNS, FIELD EFFECT TRANSISTORS, MICROSTRIP TRANSMISSION...
A rain gauge network comprised of 10 tipping bucket rain gauges located in the Mid-Atlantic coast of the United States has been in continuous operation since June 1, 1986. Rain rate distributions and estimated slant path fade distributions at 20 GHz and 30 GHz covering the first five year period were derived from the gauge network measurements, and these results were described by Goldhirsh. In this effort, rain rate time duration statistics are presented. The rain duration statistics are of...
Topics: NASA Technical Reports Server (NTRS), RAIN, RAIN GAGES, SIGNAL FADING, SUPERHIGH FREQUENCIES,...
Utilize coaxial horn feed to illuminate reflector; feed has inner horn for X-band, and outer horn for S-band. Tracking error signals for servo correction are derived from measurements of relative phase and relative amplitude between two modes.
Topics: NASA Technical Reports Server (NTRS), CIRCULAR POLARIZATION, DIRECTIONAL ANTENNAS, MULTICHANNEL...
A calibration and an accuracy assessment of the Lightning Detection and Ranging System (LDAR) were attempted through a simultaneous track of an S Band radar transponder and a lightning simulator carried by the NASA 6 airplane on a test flight. Included in the report are the results of the calibration test, error analyses of the radar, and the LDAR systems, and recommendations for future calibration tests.
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, RADAR, SUPERHIGH FREQUENCIES, ERROR ANALYSIS,...
A preliminary study of the application of Doppler radar to the classification of birds is reported. The desirability for improvements in bird classification stems primarily from the hazards they present to jet aircraft in flight and in the vicinity of airports. A secondary need exists in the study of bird migration. The wing body and tail motion of a bird in flight reflect signals which, when analyzed properly present a signature of wing beat pattern which is unique for each bird species....
Topics: NASA Technical Reports Server (NTRS), BIRDS, CHARACTER RECOGNITION, DOPPLER RADAR, FLIGHT HAZARDS,...
This report describes measurements to determine transmission losses in S-band (2.60-3.95 GHz) waveguide sections due to misalignment of the sections relative to each other. The experiments were performed in support of the Hydrostar program to determine the feasibility of using deployable waveguide sections in a large space radiometer. The waveguide sections would possibly be hinged and folded for launch, then deployed in space to form long sections of waveguide. Since very low losses are...
Topics: NASA Technical Reports Server (NTRS), TRANSMISSION LOSS, RADIOMETERS, WAVEGUIDES, MISALIGNMENT,...
261
261
Jun 12, 2011
06/11
by
NON
texts
eye 261
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Through a combination of experimental and computational studies, researchers at the NASA Lewis Research Center investigated the effect of upstream blade-row wake passing on the showerhead (leading edge) film cooling of a downstream turbine. The experiments were performed in a steady-flow annular turbine cascade facility equipped with an upstream rotating row of cylindrical rods to produce a periodic wake field similar to that found in an actual turbine. Spanwise, chordwise, and temporal...
Topics: INTEGRATED CIRCUITS, ANTENNA ARRAYS, MICROWAVE CIRCUITS, PHASED ARRAYS, ACTS, COSTS, GALLIUM...
478
478
Jun 26, 2011
06/11
by
Nakamura, Ryo; Nakamura, Shinichi; Kudo, Nobuo; Katagiri, Seij
texts
eye 478
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The Advanced Land Observing Satellite (ALOS) has been developed to contribute to the fields of mapping, precise regional land coverage observation, disaster monitoring, and resource surveying. Because the mounted sensors need high geometrical accuracy, precise orbit determination for ALOS is essential for satisfying the mission objectives. So ALOS mounts a GPS receiver and a Laser Reflector (LR) for Satellite Laser Ranging (SLR). This paper deals with the precise orbit determination experiments...
Topics: SUPERHIGH FREQUENCIES, RADIO COMMUNICATION, SPACECRAFT CONFIGURATIONS, RATES (PER TIME),...
Waveguide-in-waveguide technique involves routing two waveguides through same passageway. Smaller waveguide can be soft or silver soldered inside X-band waveguide to form single ridge guide and to propagate frequencies at C-band.
Topics: NASA Technical Reports Server (NTRS), BROADBAND, C BAND, COAXIAL CABLES, SUPERHIGH FREQUENCIES,...
487
487
Jun 21, 2010
06/10
by
Hodgson, J. N.; Macosko, R. P
texts
eye 487
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SNAP 8 35 kW nuclear electric space power system
Topics: APOLLO PROJECT, RADIO RECEIVERS, SPACECRAFT COMMUNICATION, SPACECRAFT TRACKING, SUPERHIGH...
A waveguide structure for combining the outputs of four amplifiers operating at 35 GHz (Ka band) is based on a similar prior structure used in the X band. The structure is designed to function with low combining loss and low total reflected power at a center frequency of 35 GHz with a 160 MHz bandwidth. The structure (see figure) comprises mainly a junction of five rectangular waveguides in a radial waveguide. The outputs of the four amplifiers can be coupled in through any four of the five...
Topics: NASA Technical Reports Server (NTRS), EXTREMELY HIGH FREQUENCIES, RECTANGULAR WAVEGUIDES, SUPERHIGH...
The existing designs of the X-3060 and X-3075 klystrons were critically examined to determine whether or not realistic redesign goals could be established. Additionally, failure analyses and field failure reports were examined to identify any design weaknesses. Results of this critical analysis indicate that substantial improvements can be made to the overall design of both the X-3060 and X-3075 klystrons. Pertinent and detailed data concerning these improvements are reported herein.
Topics: NASA Technical Reports Server (NTRS), EQUIPMENT SPECIFICATIONS, KLYSTRONS, OPTIMIZATION, FAILURE...
Slow-wave structure of traveling-wave maser utilizes comb system which is comprised of ruby on one side and alumina on other; alumina also supports isolator material. Radiation at pump frequency is coupled to ruby through shaped alumina strips. Contact between ruby bars and comb completes conductance path for heat transfer.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM OXIDES, MASERS, RUBY, SUPERHIGH FREQUENCIES,...
350
350
Jun 21, 2010
06/10
by
Heilman, R. L
texts
eye 350
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Fabrication and performance of gold foil-carboxy nitroso rubber laminate for fuel expulsion bladder of Saturn 5/S-4B stage
Topics: MARINER 5 SPACE PROBE, SPACECRAFT CONTROL, SPACECRAFT PERFORMANCE, CELESTIAL MECHANICS, COMPUTER...
249
249
Jun 13, 2011
06/11
by
Bogard, Donald D.; Garrison, D. H.; Herzog, G. F.; Xue, S.; Klein, J.; Middleton, R
texts
eye 249
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Collisions probably occurred frequently in the early history of the asteroid belt. Their effects, which should be recorded in meteorites, must have included heating and melting along with shock alteration of mineral textures. Some non-chondritic meteorite types e.g., eucrites and IIE and IAB irons - do indeed give evidence of extensive impact heating more than 3.4 Gyr ago. The ordinary chondrites, in contrast, show little evidence of early impact heating. The Ar-Ar and Rb-Sr ages of ordinary...
Topics: SPACECRAFT COMMUNICATION, FREQUENCY SHIFT KEYING, TRANSMITTER RECEIVERS, RATES (PER TIME), MARS...
The feasibility of using the interaction between a thin, solid, spiraling electron beam of 10 to 20 kV energy and a microwave cavity to generate watts of CW millimeter-wave power was investigated. Experimental results are given for several prototype devices operating at 9.4 GHz and at 94 GHz. Power outputs of 5 W, and electronic efficiencies near 3%, were obtained at X band, and moderate gain was obtained at 94 GHz. The small-signal theory gives a good fit to the X-band data, and the device...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC GENERATORS, ELECTRON BEAMS, MICROWAVE EQUIPMENT,...
A modulator utilizing the Ku-band instead of the usual S-band has been developed to improve transmission rates for suborbital platforms.
Topics: NASA Technical Reports Server (NTRS), MODULATORS, SUPERHIGH FREQUENCIES, TELEMETRY, SUBORBITAL...
647
647
Jul 12, 2010
07/10
by
Vonglahn, U.; Goodykoontz, J
texts
eye 647
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A method which shows that increasing the annulus width of a conventional coaxial nozzle with constant bypass velocity will lower the noise level is described. The method entails modifying a concentric coaxial nozzle to provide an eccentric outer stream annulus while maintaining approximately the same through flow as that for the original concentric bypass nozzle. Acoustical tests to determine the noise generating characteristics of the nozzle over a range of flow conditions are described. The...
Topics: DEEP SPACE INSTRUMENTATION FACILITY, DEEP SPACE NETWORK, SIGNAL TRANSMISSION, CONTROL EQUIPMENT,...
269
269
Jun 21, 2010
06/10
by
Duxbury, T. C
texts
eye 269
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Generation of near encounter spacecraft-target planet celestial geometry using two body trajectory computerized simulation
Topics: DEEP SPACE INSTRUMENTATION FACILITY, PARABOLIC ANTENNAS, PERFORMANCE TESTS, SUPERHIGH FREQUENCIES,...
An attempt is made to provide both the WEFAX user and the APT user with the basic equipments necessary to convert present equipment to the new SMS WEFAX frequency. This conversion is simple and, as in all communication systems, can be accomplished by innumerable approaches. The approach used here assumed commercial purchase of components and integration by the user into his system. This conversion requires no modification to existing equipment and is simply an RF conversion from S-band to the...
Topics: NASA Technical Reports Server (NTRS), FREQUENCY CONVERTERS, SPACECRAFT COMMUNICATION, SUPERHIGH...
Whether for scientific inquiry, weather forecasting, or public safety, the world relies upon the data gathered by satellite remote sensing. Some of NASA s most valuable work is in its remote sensing capabilities - the ability to retrieve data acquired at great distances - affording a height and scope not available from the ground. NASA satellites in low Earth orbit (LEO) monitor ocean health by taking large-scale pictures of phytoplankton blooms and measuring surface temperatures; snap...
Topics: NASA Technical Reports Server (NTRS), SATELLITE OBSERVATION, SUPERHIGH FREQUENCIES, DATA SYSTEMS,...
339
339
May 29, 2011
05/11
by
Johnson, Andrew E.; Matthies, Larry H
texts
eye 339
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Space science and solar system exploration are driving NASA to develop an array of small body missions ranging in scope from near body flybys to complete sample return. This paper presents an algorithm for onboard motion estimation that will enable the precision guidance necessary for autonomous small body landing. Our techniques are based on automatic feature tracking between a pair of descent camera images followed by two frame motion estimation and scale recovery using laser altimetry data....
Topics: DEEP SPACE NETWORK, NASA SPACE PROGRAMS, COMMUNICATION NETWORKS, OPTICAL COMMUNICATION, COST...
A significant motivation for the development of a next generation system for geodetic VLBI was to address growing problems related to RFI. In this regard, the broadband 2-14 GHz frequency range proposed for VLBI2010 has advantages and disadvantages. It has the advantage of flexible allocation of band frequencies and hence the ability to avoid areas of the spectrum where RFI is worst. However, the receiver is at the same time vulnerable to saturation from RFI anywhere in the full 2-14 GHz range....
Topics: NASA Technical Reports Server (NTRS), BROADBAND, GEODESY, RADIO FREQUENCY INTERFERENCE, SIGNAL...
The 20 kW X-band transmitter power amplifier and its related control and monitor cabinet are described. The circuitry for the monitoring and protection of various transmitter components is discussed.
Topics: NASA Technical Reports Server (NTRS), POWER AMPLIFIERS, SUPERHIGH FREQUENCIES, TRANSMITTERS,...
Providing an extension to parametric analysis of the telecommunications support capability of the Tracking and Data Relay Satellite System (TDRSS), this phase considers candidate modulation waveforms which could meet the shuttle telecommunications requirements and also be compatible with the TDRSS single access S-band service. In addition, it considers the feasibility of modifying a single access S-band user transponder for operation with conventional STDN signals emanating from remotely...
Topics: NASA Technical Reports Server (NTRS), TDR SATELLITES, TELECOMMUNICATION, RADIO RELAY SYSTEMS, SPACE...
344
344
Jul 12, 2010
07/10
by
NON
texts
eye 344
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comment 0
No Abstract Available
Topics: DEEP SPACE INSTRUMENTATION FACILITY, SYSTEMS ENGINEERING, ULTRAHIGH FREQUENCIES, LAUNCH VEHICLES,...
464
464
Jun 13, 2011
06/11
by
NON
texts
eye 464
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A method is disclosed for identifying a sediment accumulation from an image of a part of the earth's surface. The method includes identifying a topographic discontinuity from the image. A river which crosses the discontinuity is identified from the image. From the image, paleocourses of the river are identified which diverge from a point where the river crosses the discontinuity. The paleocourses are disposed on a topographically low side of the discontinuity. A smooth surface which emanates...
Topics: AIRCRAFT ICING, MOISTURE CONTENT, MICROWAVES, REMOTE SENSING, DATA PROCESSING, RADIOMETERS, RADAR...
Traditional command uplink receivers are very limited in performance capability, take a long time to acquire, cannot operate on both uplink bands (NASA & AFSCN), and only support low-rate communications. As a result, transceivers end up on many programs critical paths, even though they should be a standard purchased spacecraft subsystem. Also, many missions are impacted by the low effective uplink throughput. In order to tackle these challenges, a transceiver was developed that will provide...
Topics: NASA Technical Reports Server (NTRS), FIELD-PROGRAMMABLE GATE ARRAYS, SUPERHIGH FREQUENCIES,...
An expanded introduction is presented which addresses the in-depth nature of the tasks and indicates continuity of the reported effort and results with previous work and related contracts, and the two major modes of operation which exist in the Ku-band system, namely, the radar mode and the communication mode, are described. The Ku-band radar system is designed to search for a target in a designated or undesignated mode, then track the detected target, which might be cooperative (active) or...
Topics: NASA Technical Reports Server (NTRS), SPACE SHUTTLE ORBITERS, SUPERHIGH FREQUENCIES, TRACKING...
The results are presented of work performed on the Space Shuttle Ku-Band Integrated Rendezvous Radar/Communications System Study. The recommendations and conclusions are included as well as the details explaining the results. The requirements upon which the study was based are presented along with the predicted performance of the recommended system configuration. In addition, shuttle orbiter vehicle constraints (e.g., size, weight, power, stowage space) are discussed. The tradeoffs considered...
Topics: NASA Technical Reports Server (NTRS), SATELLITE-BORNE RADAR, SPACE RENDEZVOUS, SPACE SHUTTLES,...
