Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Patent
1990-03-09
1993-04-06
Hille, Rolf
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
343881, 343DIG2, H01Q 1120, H01Q 1220, H01Q 3300
Patent
active
052007588
ABSTRACT:
An antenna system is provided having a plurality of individual antenna elements located on a foldable platform. The antenna elements are appropriately phased to yield a desired radiation pattern. The platform has a plurality of light-emitting devices mounted at predetermined locations on the platform. Light from each of the light-emitting devices passes through a corresponding window assembly on a hub. A biconical reflector within the hub directs rays of light from all the light-emitting devices through a telescope and a system of mirrors which focus the rays so as to form images on photodetector arrays. The images formed by the focused optical signals relate to the actual configuration of the platform. A signal processor analyzes the photodetector arrays and generates electrical signals for changing the phase of the individual antenna elements so as to maintain the desired radiation pattern, thereby yielding substantially diffraction limited performance of the antenna system via control of the radiation pattern.
REFERENCES:
patent: 4586051 (1986-04-01), Saitto et al.
patent: 4811033 (1989-03-01), Ahl et al.
Anderson et al., Structural Alignment Sensor Feasibility Demonstration Final Report, NASA Contract #NA57-100, Report No. LMSC-D644951, 1978, 42 pages.
R. S. Neiswander, Conceptual Design of a Surface Measurement System for Large Deployable Space Antennas, Large Space Systems Technology 1981, Third Ann. Tech. Review, Nov. 16-19, 1981, pp. 631-639.
M. Berdahl, Surface Measurement System Development, Large Space System Technology-1981, Third Ann. Tech. Rev., Nov. 16-19, 1981, pp. 479-490.
J. M. McLauchlan, Spatial, High-Accuracy, Position Encoding Sensor (Shapes) for Large Space System Control Applications, Large Space Systems Technology-1981, Third Ann. Tech. Rev., Nov. 16-19, 1981, pp. 283-296.
Collyer et al., Electro-Optical System for Remote Position Measurements in Real Time, Large Space Systems Technology-1981, Third Ann. Tech. Rev. Nov. 16-19, 1981, pp. 641-655.
Brown Peter Toby
Hille Rolf
Lockheed Missiles & Space Company Inc.
Morrissey John J.
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