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Monopulse radar system

  • US 3,996,589 A
  • Filed: 08/15/1974
  • Issued: 12/07/1976
  • Est. Priority Date: 12/22/1972
  • Status: Expired due to Term
First Claim
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1. In a monopulse radar system comprising fixedly-mounted antenna means having a given axis for simultaneously picking up a respective signal from each member of a set of discrete spaced electromagnetic beam components disposed substantially symmetrically about said axis, and means coupled to said antenna means for utilizing predetermined sum and difference signals of said respective picked-up signals;

  • the improvement wherein said system includes axis-rotating means coupled to said utilizing means which in effect rotates said set of beam components about said axis through any given angle by combining certain of said signals in accordance with predetermined transformation functions of said given angle to obtain the effect of rotation of said axis through said given angle, wherein said set includes four beam components spatially distributed about said axis in the form of a square, whereby the position of each beam component corresponds with a different vertex of said square with the vertices corresponding to first and second ones of said beam components defining a first side of said square, and vertices corresponding to third and fourth ones of said beam components defining a second side of said square, the vertices corresponding to said first and third ones of said beam components defining a third side of said square, and the vertices corresponding to said second and fourth ones of said beam components defining a fourth side of said square;

    wherein said utilization means includes means for deriving a summation signal equal to the sum of the picked-up signals of all said four beam components, a first difference signal equal to the difference between the sum of picked-up signals of said first and second beam components and the sum of picked-up signals of said third and fourth beam components, and a second difference signal equal to the difference between the sum of the picked-up signals of said first and third beam components and the sum of the picked-up signals of said second and fourth beam components, and wherein said transformation functions are defined by the following formula;

    1 Δ

    A'"'"' = Δ

    A cos - Δ

    B sinθ

    2 Δ

    B'"'"' = Δ

    B sin + Δ

    B cosθ

    ;

    where Δ

    A is said first difference signal, Δ

    B is said second difference signal, θ

    is said given angle of rotation;

    Δ

    A'"'"' is a rotated first difference signal and Δ

    B'"'"' is a rotated second difference signal.

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