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  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2018-12-01
    Description: This paper describes how a station, designed, built, and operated for spacecraft communications has been used for scientific planetary radar studies. The thrust of the paper is the mutual advantage that the NASA/JPL Deep Space Network (DSN) and the Goldstone Solar System Radar have derived from sharing some equipment. It is concluded that, by allocating a small fraction of a DSN station's tracking time to planetary radar studies, a superb scientific instrument has been developed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IAF PAPER 88-417
    Format: text
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  • 2
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    Unknown
    In:  Other Sources
    Publication Date: 2018-12-01
    Description: The development of earth observation standards and the need for cooperation between national and international earth resource organizations are discussed. Possible solutions to the problem of developing a coordinated effort in the development of observational satellite systems are given. The activities of the AIAA Earth Observation Committee on Standards are reviewed. It is suggested that earth observation organizations must combine their resources and efforts and that computer programs of earth observation organizations, their work and products, and agreements between various organizations, should be developed. Charts of organizations addressing the problems in earth observations by satellite are presented, including descriptions of their activities.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IAF PAPER 88-107
    Format: text
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  • 3
    Publication Date: 2018-12-01
    Description: The tracking of the ICE spacecraft at its encounter with the comet Giacobini-Zinner posed a major problem for the Deep Space Network (DSN). At the comet, ICE was nearly 50 times as distant from the earth as it was during its designed mission. Its signal strength at the ground was diminished by almost 2500 times from its designed level. The paper describes how the DSN met this challenge by combining antennas in arrays and cooperating with the Arecibo Observatory in Puerto Rico and the Usuda 64m antenna in Japan.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IAF PAPER 86-299
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  • 4
    Publication Date: 2013-08-31
    Description: Nickel electrodes made using lightweight plastic plaque are about half the weight of electrodes made from state of the art sintered nickel plaque. This weight reduction would result in a significant improvement in the energy density of batteries using nickel electrodes (nickel hydrogen, nickel cadmium and nickel zinc). These lightweight electrodes are suitably conductive and yield comparable capacities (as high as 0.25 AH/gm (0.048 AH/sq cm)) after formation. These lightweight electrodes also show excellent discharge performance at high rates.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: E-1967 , NAS 1.15:86861 , NASA-TM-86861
    Format: application/pdf
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  • 5
    Publication Date: 2013-08-31
    Description: Chromium electrodes were prepared for the NASA Redox Storage System with meet the performance requirements for solar-photovoltaic, wind-turbine and electric utility applications. Gold-lead catalyzed carbon felt electrodes up tp 930 sq cm were fabricated and tested in single cells and multicell stacks for hydrogen evolution, coulombic efficiency, catalyst stability and electrochemical activity. Factors which affect the overall performance of a particular electrode include the carbon felt lot, the cleaning treatment and the gold catalyzation method. Effects of the chromium solution chemistry and impurities on charge/discharge performance are also presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82724 , DOE/NASA/12726-15 , E-1025
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  • 6
    Publication Date: 2013-08-31
    Description: A broadband constant law detector was developed for precision power measurements, radio metric measurements, and other applications. It has a wide dynamic range and an accurate square law response. Other desirable characteristics, which are all included in a single compact unit, are: (1) high-level dc output with immunity to ground loop problems; (2) fast response times; (3) ability to insert known time constants; and (4) good thermal stability. The detector and its performance are described in detail. The detector can be operated in a programmable system with a ten-fold increase in accuracy. The use and performance of the detector in a noise-adding radiometer system is also discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-143459 , JPL-TR-32-1599
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  • 7
    Publication Date: 2013-08-31
    Description: The Cr(III) complexes in the NASA Redox Energy Storage System were isolated and identified as Cr(H2O)6(+3) and Cr(H2O)5Cl(+2) by ion exchange chromatography and visible spectrophotometry. The cell reactions during charge-discharge cycles were followed by means of visible spectrophotometry. The spectral bands were resolved into component peaks and concentrations calculated using Beer's Law. During the charge mode Cr(H2O)5Cl(+2) is reduced to Cr(H2O)5Cl(+) and during the discharge mode Cr(H2O)5Cl(+) is oxidized back to Cr(H2O)5Cl(+2). Both electrode reactions occur via a chloride-bridge inner-sphere reaction pathway. Hysteresis effects can be explained by the slow attainment of equilibrium between Cr(H2O)6(+3) and Cr(H2O)5Cl(+2).
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: E-1318 , NAS 1.15:82913 , NASA-TM-82913 , DOE/NASA/12726-17
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  • 8
    Publication Date: 2013-08-31
    Description: The theory and experimental work which demonstrated the feasibility of conical-scan tracking with a 64 m diameter paraboloid antenna is documented. The purpose of this scheme is to actively track spacecraft and radio sources continuously with an accuracy superior to that obtained by manual correction of the computer driven pointing. The conical-scan implementation gives increased tracking accuracy with X-band spacecraft signals, as demonstrated in the Mariner Venus/Mercury 1973 mission. Also, the high accuracy and ease of measurement with conical-scan tracking allow evaluation of systematic and random antenna tracking errors.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: JPL-TR-32-1605 , NASA-CR-149144
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  • 9
    Publication Date: 2013-08-31
    Description: A discussion of mathematical models of insolation characteristics suitable for use in analysis of solar energy systems is presented and shows why such models are essential for solar energy system design. A model of solar radiation for the Mojave Desert area is presented with probabilistic and deterministic components which reflect the occurrence and density of clouds and haze, and mimic their effects on both direct and indirect radiation. Multiple comparisons were made between measured total energy received per day and the corresponding simulated totals. The simulated totals were all within 11 percent of the measured total. The conclusion is that a useful probabilistic model of solar radiation for the Goldstone, California, area of the Mojave Desert has been constructed.
    Keywords: GEOPHYSICS
    Type: JPL-PUB-78-11 , NASA-CR-156140
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  • 10
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    In:  Other Sources
    Publication Date: 2018-12-01
    Description: This paper discusses the feasibility of building and launching a truly deep-space spacecraft mission that will penetrate near interstellar space to a depth of one thousand astronomical units (TAU) within a flight time of 50 years. Particular attention is given to the mission profile and to its communications system, power system, and propulsion system. Results of experimental studies indicate that, with advanced technology, reasonable trip times can be achieved and adequate science information can be brought to earth.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: IAF PAPER 89-662
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