Direction Finding Antenna Systems

Abstract

Monopulse antenna systems have attracted a lot of attention in radar, military and other wireless communication applications where determining the direction-of-arrival (DoA) is required. Monopulse antenna systems are employed to determine direction-of-arrival (DoA) where the angle of arrival (AoA) is measured using a single pulse. One of the most significant advantages of this type of system is its speed of operation. As all of the necessary computations are performed in the hardware that are available instantly. In amplitude monopulse technique, absence of phase information results in angular ambiguities that causes false angle-of-arrival (AoA) estimation in given field-of-view (FoV). Such angular ambiguity in sign (±) associated with AoA has been addressed with phase-based power summation property of 90° hybrid coupler and orthogonal switched-beams.