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  • EARTH RESOURCES AND REMOTE SENSING  (1)
  • SOLAR PHYSICS  (1)
  • SPACECRAFT INSTRUMENTATION  (1)
  • 1
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    A timed-correlated four-link Doppler Tracking system (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Phase perturbations that occur in the following components of the one and two-way systems are considered: (1) one-way system (signal from A to B): station a oscillator - transmitter A antenna A - signal path - antenna B - receiver B station B oscillator - recording system B; (2) two-way system (signal from A to B back to A): station A oscillator - transmitter A - antenna A - signal path up - antenna B - transponder B - antenna B - signal path down - receiver A - station A oscillator - recording system A. A symmetrical one- and two-way system which can identify the place of origin of the fluctuation and quantify it so as to recover the unperturbed phase at a given moment of time by time-correlating the phase fluctuations obtained in the one- and two-way data taken at both stations is described
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 457-497
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Test of relativistic gravitation with a space-borne hydrogen maser (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The results of a test of general relativity with use of a hydrogen-maser frequency standard in a spacecraft launched nearly vertically upward to 10,000 km are reported. The agreement of the observed relativistic frequency shift with prediction is at the 70 x 10 to the -6th level.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Physical Review Letters; 45; Dec. 29
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Hydrogen maser frequency standard (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The fundamental theoretical limitations of the maser, systematic processes that cause instability, and some aspects of recently designed masers are described. A design for field use that has evolved from the development of the space borne maser is presented. The performance of this type of maser is close to theoretical limits imposed by thermal noise. Further developments of smaller masers for space and terrestrial use and recent work on masers operating at low temperatures is also discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 203-221
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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