Toward real time compensation with a combined DFP/AFCS system
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gravity compensation deformable flat plate array f↗
Engineering topics
Girdner, D.
Publications and source records attributed to Girdner, D..
RF performance measurement of the DSS-14 70-meter antenna at C-band/L-band
The calibration of the 70-meter antenna at C-band (5.01 GHz) and L-band (1.668 GHz) is described. This calibration comes after a modification to an existing L-band feed to include the C-band frequencies. The test technique employs noise-adding radiometers and associated equipment running simultaneously at both frequencies. The test procedure is described including block diagrams, and results are presented for efficiency, system temperature, and pointing.
Gatti, M. S.↗
DSS 14 operating noise temperature during Helios 1 near-sun tracking
When spacecraft are tracked near the line-of-sight of the sun, the ground antenna sidelobes see the solar noise. The solar noise increases the ground system operating noise temperature and degrades the downlink RF reception performance. At specific antenna azimuthal angles relative to the sun, noise peaks and nulls occur periodically throughout a day's tracking pass due to the quadripod support leg-generated sidelobes. This article documents this effect while tracking Helios 1, illustrates the time of the peaks, and compares the predicted time of the noise temperature peaks with the measured data.
Stelzried, C. T.↗