Radar: (acronym of Radio, Angle, Direction and Range) was designed to detect and find the range of moving objects by transmitting a beam of radio waves in the general direction of the objects and measuring the time taken for the reflected part of the wave (the echo) to return to the source of transmission. It gives the location, velocity, shape size, and nature of stationary and moving objects. Navigators on the sea, air and moving vehicles, missiles and artificial satellites all use radar