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  • 1
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    The X-band low noise antenna measurement cone (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: An X-band low-noise receiving cone with 17-MHz instantaneous bandwidth was built to evaluate the 26-m antenna at the Venus Station (DSS 13), Goldstone, California, at X-band frequencies, and also to provide a means for precise radio source calibrations in this frequency range. These measurments are necessary to provide more accurate antenna gain performance calibrations for the 64-m antenna subnet. The zenith system temperatures with the cone on the ground and on the antenna are 17.5 and 20.8 K, respectively.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 105-112
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Conical scan tracking system employing a large antenna (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A conical scan tracking system for tracking spacecraft and distant radio sources is described. The system detects small sinusoidal modulation in received power from a source that is off target with a frequency equal to a very low scan rate, an amplitude proportional to angular deviation of the source from the target, and a phase directly related to the direction the source is off target. The sinusoid is digitally correlated with inphase and out-of-phase scan sinusoids to obtain azimuth/elevation and hour angle/declination signals which are digitally integrated over exactly one scan period to obtain correction signals for an antenna pointing subsystem.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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