Abstract: An apparatus comprising a first waveguide portion, a second waveguide portion and an attachment. The first waveguide portion may comprise a first half of a waveguide input and a first layer of a two-layer waveguide board. The second waveguide portion may comprise a second half of the waveguide input and a second layer of the two-layer waveguide board. The attachment may be configured to connect the first waveguide portion to the second waveguide portion. The first half of the waveguide input may have a same height as the second half of the waveguide input. The two-layer waveguide board may be configured to implement a waveguide network for an antenna array. A horn antenna aperture for each antenna in the antenna array may be implemented on the first waveguide portion.

Abstract: A method for virtual aperture array radar tracking includes: transmitting first and second probe signals; receiving a first reflected probe signal at a radar array; receiving a second reflected probe signal at the radar array; calculating a target range from at least one of the first and second reflected probe signals; corresponding signal instances of the first reflected probe signal to physical receiver elements of the radar array; corresponding signal instances of the second reflected probe signal to virtual elements of the radar array; calculating a first target angle by performing beamforming from the signal instances of the first and second reflected probe signals; and calculating a position of the tracking target relative to the radar array from the target range and first target angle.

Abstract: A method for four-dimensional radar tracking includes transmitting a first probe signal; receiving a first reflected probe signal at first and second radar arrays of the radar system; detecting a tracking target; calculating a target range; calculating a target range rate; performing ambiguous angle calculations for first and second target angles; performing unambiguous angle calculations for the first and second target angles; and calculating a four-dimensional tracking solution, including position and range-rate, from the target range, target range-rate, ambiguous angle calculations, and unambiguous angle calculations.