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
Seismic refraction Seismic refraction Seismic refraction is a geophysical principle (see refraction) governed by Snell's Law. Used in the fields of engineering geology, geotechnical engineering and exploration geophysics, seismic refraction traverses (seismic lines) are performed using a seismograph(s) and/or geophone(s), in an array and an energy source. The seismic refraction method utilizes the refraction of seismic waves on geologic layers and rock/soil units in order to characterize the subsurface geologic conditions and geologic structure. The methods depend on the fact that seismic waves have differing velocities in different types of soil (or rock): in addition, the waves are refracted when they cross