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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 861-861 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. 4.3-mm. solar scans across plage region and flare of importance 3. Upper curves, observed scans; lower, quiet sun scans for comparison McCullough at the Naval Research Laboratory recorded the 9.4-cm. solar radiation on September 26, and Fig. 2 is his record of the burst observed coincident ...
    Type of Medium: Electronic Resource
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  • 2
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    In:  CASI
    Publication Date: 2013-08-31
    Description: Tracking and data acquisition system between spacecraft and ground station
    Keywords: SPACE SCIENCES
    Type: X-520-69-200 , NASA-TM-X-63629
    Format: application/pdf
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  • 3
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    In:  Other Sources
    Publication Date: 2018-12-01
    Description: Highly accurate Satellite Laser Ranging (SLR) and Very-Long-Baseline Interferometry (VLBI) have been implemented by the NASA Crustal Dynamics Project and many cooperating groups in many countries to form global SLR and VLBI networks for geodetic measurements of global plate motion, plate deformation, regional deformations in areas of high earthquake activity, and accurate measurements of the earth's polar motion and changes in rotation rate. These systems are measuring vector baselines between stations to an accuracy of 2-5 cm. New improvements being implemented will improve the accuracy to about 1 cm.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IAF PAPER 86-301
    Format: text
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  • 4
    Publication Date: 2016-06-07
    Description: Very long baseline interferometry observations made with a 3900 km baseline interferometer (Haystack Observatory in Massachusetts to Owens Valley Observation in California) were used to estimate changes in the X-component of the position of the Earth's pole and in UT1. These estimates are compared with corresponding ones from lunar laser ranging, satellite laser ranging, satellite Doppler, and stellar observations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Radio Interferometry; p 33-44
    Format: application/pdf
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  • 5
    Publication Date: 2016-06-07
    Description: Accurate baseline determinations and clock synchronization results obtained from the Quasar Patrol observations at X band with the Goldstone-Haystack baseline are presented. In addition, data from stations at Greenbank, West Virginia, and Onsala, Sweden were used. It was estimated that clock accuracy was on the order of 16 cm.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Its Proc. of the Sixth Ann. Precise Time and Time Interval (PTTI) Planning Meeting; p 361-371
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  • 6
    Publication Date: 2016-06-07
    Description: Very long base interferometry (VLBI) and laser ranging to artificial satellites and the Moon were used to determined vector baselines between stations with precisions of about one part in 10 to the 8th power. Deformations and strain accumulations in active earthquake regions were determined by making frequent measurements of baselines between many stations in active areas near plate boundaries.
    Keywords: LASERS AND MASERS
    Type: Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 649-662
    Format: application/pdf
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  • 7
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    In:  Other Sources
    Publication Date: 2011-08-18
    Description: Scheduling considerations in the deployment of transportable laser ranging systems (TLRS) in 1985 are discussed. The new TLRS units will be field tested in North America and Europe first before being sent to remote Mediterranean and South American sites. Six weeks' residence will be required for 600 hr of measurements at each site, although a second crew could bring the necessary time down to four weeks. The surveys are set for periods of the year with the greatest incidence of clear skies. Twelve sites have been selected in the Mediterranean area, although no weather data have been acquired. Site selections are constrained by the need for accessible roads, telephones, and the stability of the terrain. Details of the marker monument layouts are provided.
    Keywords: GEOPHYSICS
    Type: Annales Geophysicae (ISSN 0755-0685); 2; 261-263
    Format: text
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  • 8
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    In:  Other Sources
    Publication Date: 2011-08-11
    Description: Millimeter wavelength solar radiation consisting of thermal, slowly varying active and burst components and eclipse measurements of brightness distribution
    Keywords: SPACE SCIENCES
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  • 9
    Publication Date: 2011-08-19
    Description: The NASA Crustal Dynamics Project (CDP) has deployed satellite laser ranging (SLR) systems and VLBI techniques for measurements of global and regional crustal motions and earth rotation parameters. The measurement programs for the years 1984 and 1983 are described, and some preliminary results are presented. A complete list of the fixed receiving stations in the CDP network is given.
    Keywords: GEOPHYSICS
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-23; 360-368
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  • 10
    Publication Date: 2011-08-18
    Description: Technical specifications, performance, and applications of the NASA transportable laser ranging systems (TLRS-1 and -2) for use in the Crustal Dynamics Program are described. TLRS-1 is truck-mounted, with the laser deployed through the roof. Interacting with the LAGEOS satellite, TLRS has a photoelectric receiver for gathering data on the roundtrip time of the laser beam for calculations of the range gate. The laser has a 0.1 nsec pulse at 3.5 mJ/pulse. Range is measured to within an error of 9 cm. The TLRS-2 version is configured for ease of air transport and modular breakdown and assembly. It has been activated on Easter Island. TLRS-3 and -4 are in development to serve as mobile units in South America and the Mediterranean area.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Annales Geophysicae (ISSN 0755-0685); 2; 259
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