Title: Level and cross-level stabilization technique for search radar antennas

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Claims: What is claimed and desired to be secured by Letters Patent of the United States is:

1. A motion stabilized high-frequency antenna system comprising;

an antenna platform;

a high frequency antenna having a primary focusing structure moveable about both elevation and optical axes of said antenna, and a secondary focusing structure rigidly mounted on said antenna platform wherein said primary focusing structure is comprised of a high frequency feedhorn directed at an attached subreflector, said feed horn and subreflector movable in unison with respect to said secondary focusing structure;

means for sensing the position of said secondary focusing structure with respect to a desired position and for generating rotating means positioning signals proportional to the elevation axis and optical axis components of the position difference between said sensed position and said desired position, said optical axis positioning signal indicating a direction of motion opposite to said sensed position difference, and said elevation axis positioning signal indicating the same direction of motion as said sensed position difference; and

means connected to said sensing means for rotating said primary focusing structure separately and independently about said optical axis and said elevation axis of said antenna, whereby a change proportional to said sensed position difference as indicated by said positioning signals is produced in the position of said primary focusing structure.

2. The antenna system of claim 1 wherein said secondary focusing structure has a maximum vertical dimension and a maximum horizontal dimension, and wherein said signals corresponding to the optical axis and elevation axis respectively are proportional to the Beam Deviation Factor corresponding to said vertical and horizontal dimensions.

3. The antenna system of claim 2 wherein said primary focusing structure is comprised of a high frequency feed horn directed at an attached subreflector, and therein said secondary focusing structure is a parabolic reflector.
Other info:

Inventors: Lewis, Bernard L. (Oxon Hill, MD, US)

Application Number: 506927
Filing Date: 1974-09-17
Publication_date: 1976-02-17
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 343/761 343/765, 343/781R, 343/840
Other Classes:
US Patent Ref:

2976533	Mar, 1961	Salisbury	343/761.
3386100	May, 1968	Jaszberenyi	343/839.
3534373	Oct, 1970	Gustincic et al.	343/761.
3641577	Feb, 1972	Tocquec	343/839.

Other Refs:
Primary Examiner: Lieberman, Eli
Assistant Examiner:
Attorney: Sciascia; R. S., Branning; Arthur L., Brown; Norman