Modern in that which defense technologies use is radar for early identification and tracking of aerial threats. But what we see in the real world is that radar and missile defense systems are very complex and of great financial scale which in turn makes them unavailable for academic research. In this paper we present our design and development of a low-cost prototype of a Radar and Missile Defense System which we used Arduino UNO for. We used an ultrasonic sensor which we put on a servo motor to do the job of angular scan which in turn simulates the radar-based object detection. Upon an object entering what we have defined as the threat range the system we have put in place is to activate what we have for safe and non-lethal response which is in the form of visual and audio alerts to simulate interception. The prototype we present is of real time detection, angular tracking and has in it automated response logic also we did this in a safe and very much educational way.