DRDO Anti-Radiation Missile G. Satheesh Reddy, the missile will feature a millimeter wave seeker capable of lock-on before launch and lock-on after launch modes. The missile picks up the radiation or signals of radars and communication facilities and homes on to the targets to destroy them. Instead of thrust propulsion, the missile uses dual pulse propulsion system just like Barak-8/LR-SAM. The benefit of dual pulse propulsion is that it will widen the envelope as well as the engagement capability of the missile. Work on the project began in 2012 at one of the DRDO laboratories soon after the project was given the go-ahead
Refraction wave vector depend on the wave speed this requires a change in direction of the wave vector. The relevant wave speed in the discussion above is the phase velocity of the wave. This is typically close to the group velocity which can be seen as the truer speed of a wave, but when they differ it is important to use the phase velocity in all calculations relating to refraction. A wave traveling perpendicular to a boundary, i.e. having its wavefronts parallel to the boundary, will not change direction even if the speed of the wave changes. Refraction of light can