Search radars scan great volumes of space with pulses of short radio waves.The fuzes used in anti-aircraft artillery have to be mechanically designed to accept fifty thousand g, yet still be cheap enough to throw away.The frequency selection of weather radar is a performance compromise between precipitation reflectivity and attenuation due to atmospheric water vapor.Some weather radars uses doppler shift to measure wind speeds and dual-polarization for identification of types of precipitations.These generally use navigational radar frequencies, but modulate the pulse so the receiver can determine the type of surface of the reflector.Military use transponders to establish the nationality and intention of an aircraft, so that air defenses can identify possibly hostile radar returns.
Military map marking symbol
Radar
as of NATO standard
APP-6a
Surface search radar display commonly found on ships