 It provided the first clear test of the continuous wave FM Doppler radar developed during World War II by Edwin Howard Armstrong, which, by greatly increasing the signal range over the pulse radar then in use, enabled detection and tracking of potential inbound threats from intercontinental supersonic aircraft during the Cold War.It also demonstrated the feasibility of using the Moon as a passive reflector to transmit radio signals from one point on the Earth to the other, around the curve of the Earth.This Earth-Moon-Earth (EME) or "moonbounce" path has been used in a few communication systems.