First Rf Corporation

Luke S Sankey

Ian S Rumsey

Farzin Lalezari

Dean A Paschen

Sean P McDevitt

Robert T Rebich

A pair of radar nodes, each with full azimuthal coverage, cooperate to identify the position of an object without explicit measurements of the object's azimuthal coordinate. A first radar node, operating within a first azimuth field of view (FOV), measures a first elevation angle and a first slant range of the object. A second radar node, operating within a second azimuth FOV, measures a second elevation angle and a second slant range of the object. The second radar node transmits the data to the first radar node, which identifies, based on the first and second azimuth FOVs, an object half space within which the object is located. The first radar node then calculates the position of the object without an ambiguous solution. Alternatively, the first radar uses the first and second azimuth FOVs to identify and reject the ambiguous solution.

Radar node with full azimuthal coverage, and associated surveillance methods

An array antenna with dual polarization elements is provided. Each dual polarization element comprises a first sub-element and a second sub-element, each of which comprises a radiator that is embodied in and/or on a planar member and a balanced feed for the radiator that divides the radiator into two sections that that are mirror images of one another relative to a plane that passes through the balanced feed structure and is perpendicular to the planar member. Further, the radiator of the first sub-element is positioned to lie in an isolation plane associated with the second sub-element. Two such elements are positioned with respect to one another so that the planar members associated with the first elements are coplanar.

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Berthoud, CO, United States of America

Luke S Sankey