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  • Other Sources  (4)
  • 1
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    In:  CASI
    Publication Date: 2019-06-28
    Description: The work performed under this contract provides for the improvement of modeling of troposphere propagation delay in Very Long Baseline Interferometry (VLBI) data, defining of required accuracy of ancillary data type(s) to measure tropospheric behavior and to develop a clear correspondence between tropospheric behavior and the quality of geodetic VLBI measurements.
    Keywords: Communications and Radar
    Type: NASA-CR-203650 , NAS 1.26:203650
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-28
    Description: This report documents construction and testing of the Interferometric Tracking System project developed under the NASA SBIR contract NAS5-30313. Manuals describing the software and hardware, respectively entitled: 'Field Station Guide to Operations' and 'Field Station Hardware Manual' are included as part of this final report. The objective of this contract was to design, build, and operate a system of three ground stations using Very Long Baseline Interferometry techniques to measure the TDRS orbit. The ground stations receive signals from normal satellite traffic, store these signals in co-located computers, and transmit the information via phone lines to a central processing site which correlates the signals to determine relative time delays. Measurements from another satellite besides TDRS are used to determine clock offsets. A series of such measurements will ultimately be employed to derive the orbital parameters, yielding positions accurate to within 50 meters or possibly better.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-193274 , NAS 1.26:193274
    Format: application/pdf
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  • 3
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    In:  CASI
    Publication Date: 2019-07-13
    Description: The work performed under this contract provides for the improvement of modeling of troposphere propagation delay in VLBI data, defining of required accuracy of ancillary data type(s) to measure tropospheric behavior, and to develop a clear correspondence between tropospheric behavior and the quality of geodetic VLBI measurements.
    Keywords: Earth Resources and Remote Sensing
    Type: NASA-CR-200586 , NAS 1.26:200586
    Format: application/pdf
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  • 4
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    Unknown
    In:  CASI
    Publication Date: 2019-07-13
    Description: The work performed under this contract provides for the improvement of modeling of troposphere propagation delay in very long base interferometry (VLBI) data, defining of required accuracy of ancillary data type(s) to measure tropospheric behavior and to develop a clear correspondence between tropospheric behavior and the quality of geodetic VLBI measurements.
    Keywords: GEOPHYSICS
    Type: NASA-CR-199944 , NAS 1.26:199944 , NIPS-95-06477
    Format: application/pdf
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