title: AN OVERVIEW OF DIRECTION-OF-ARRIVAL ESTIMATION USING AN ANTENNA ARRAY WITH FOUR ELEMENTS
abstract: The Direction-of-Arrival (DOA) estimation techniques using antenna arrays are applied in large areas of research fields and have received great attention in literature. Mobile communication, Sonar and Radar are just some examples among a large number of possible applications. For example, in military application, it is very important to recognize the direction of any threat. Another example of commercial application is to identify the direction of an emergency cell phone call so that the rescue 
journal: American Journal of Applied Sciences