Determination of the elevation correction angles for the 30 m Helios command antenna using the ALSEP on the moon

Details Determination of the elevation correction angles for the 30 m Helios command antenna using the ALSEP on the moon Determination of the elevation correction angles for the 30 m Helios command antenna using the ALSEP on the moon

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976zflu...24..101j&link_type=abstract

Zeitschrift für Flugwissenschaften, vol. 24, Mar.-Apr. 1976, p. 101-108. In German.

Astronomy and Astrophysics

Astronomy

Apollo Lunar Surface Experiments Package, Helios Project, Pointing Control Systems, Radio Antennas, Satellite Control, Antenna Design, Command And Control, Elevation, Ground Support Systems, Lunar Orbits, Lunar Surface, Parabolic Antennas, Point Sources, Radio Astronomy, Solar Probes

Scientific paper

Instead of the methods commonly used in radio astronomy, where the pointing error for large parabolic antennas is measured using cosmic radio sources, for the 30 m antenna, the Apollo lunar surface experimental packages (ALSEP) were used. The individual steps for exactly calculating the nominal direction, at the 30 m antenna, of a point on the lunar surface are described as well as the measurement procedure for the pointing error. Using the available constants on the moon's orbit and its complicated motion, the position of the ALSEP referred to the location of the 30 m antenna can be calculated to an accuracy of plus or minus 0.0002 deg. The direction of the beam of the 30 m antenna was measured to an accuracy of plus or minus 0.005 deg at the frequencies of the ALSEP (2276 to 2280 MHz).

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