M&A for performing near field measurements on a dish antenna and

Details M&A for performing near field measurements on a dish antenna and M&A for performing near field measurements on a dish antenna and

1991-03-29

1992-06-02

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Measuring signal energy

343882, G01R 2910

Patent

active

051191059

ABSTRACT:
A method and apparatus are provided performing near-field measurements on dish antenna, in particular large dish antenna, and for utilizing these measurements to realign dish panels. The antenna is tiltable about a pivot point on a mounting pedestal to any desired elevation angle. A substantially circular track is provided which is centered at and spaced a predetermined distance from the pivot point, the track preferably being adjustably mounted to a stiff circular arch. The antenna is rotatable in the azimuth direction, preferably by rotating the pedestal, and a scanning probe is provided which is mounted for control traversal on the circular track. The probe is utilized to perform near-field measurements on the antenna at selected azimuthal positions of the antenna and selected positions of the probe on the track. The probe may also be rotatable to at least two different polarizations. The movement are performed in small stepwise increments in a predetermined sequence and measurements are taken by utilizing an RF signal transmitted by the antenna or probe and received by the other. For panel realignment, the near-field measurements are transformed mathematically to far-field values which are in turn transformed mathematically to holographic pictures which provide an indication of panel misalignment. This indication is then used to realign appropriate panels and the process repeated until panel alignments are within acceptable limits.

REFERENCES:
patent: 4201987 (1980-05-01), Tricoles et al.
K. M. Keen, "Simulation of a Proposed Near-Field-To Far-Field Antenna Measurement System", Electronics Letters, vol. 13, No. 8, Apr. 1977, pp. 225-226.
Lombardi et al., "Wide Band Antenna Test Facility", Electrical Communication, vol. 49, No. 1, 1974, pp. 94-98.
European Space Agency-Spherical Near-Field Antenna Test Facility Spherical Near-Field Antenna Measurements, J. E. Hansen.
Surface Accuracy of the ATS-2 Antenna Using Microwave Holography, Interferomatics, Inc.
Microwave System News, vol. 18, No. 12.
IEEE Transactions on Antennas and Propogation, vol. AP-33, No. 11 Nov. 1985.
Lincoln Laboratory Antenna Test Range, the Microwave Journal, Apr. 1961 The Reflector, A Computational Technique for Reflector Angennas Using Optical Methods and Shperical Wave Expansions.

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