The determination of elevation-dependent corrections for the direction of maximum radiation of the 30-m Helios radio-control antenna

Details The determination of elevation-dependent corrections for the direction of maximum radiation of the 30-m Helios radio-control antenna The determination of elevation-dependent corrections for the direction of maximum radiation of the 30-m Helios radio-control antenna

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977nacel..31..225j&link_type=abstract

Nachrichten Elektronik, vol. 31, Aug. 1977, p. 225-228. In German.

Statistics

Computation

Antenna Radiation Patterns, Directional Antennas, Helios Satellites, Microwave Antennas, Radio Control, Satellite Control, Attitude (Inclination), Calibrating, Error Correcting Devices, Lunar Surface, Pointing Control Systems, Solar Probes, Waveforms

Scientific paper

The considered antenna which is used for transmitting commands to the German-American Helios solar probes, is optimized for a mean transmission frequency of 2115 MHz. Pointing measurements can be employed to determine the effects of elevation-dependent errors concerning the correct direction of the maximum radiation of the antenna. Such errors can, for instance, occur as a consequence of reflector deformation due to the weight of the antenna structure. The pointing measurements can be conducted with an S-band signal utilizing the ALSEP transmitters left on the lunar surface after the Apollo missions. A description is presented of the calibration of the Helios radio-control antenna with the aid of the considered approach, taking into account the computation of the nominal observational data of a point on the lunar surface.

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