 Its official UK designation is Radar, GS, No 22.MSTAR was developed and produced in UK in the mid 1980s by Thorn EMI Electronics (now part of Thales).It is a Doppler radar operating in the J Band, and is capable of detecting, recognising and tracking helicopters, slow moving fixed-wing aircraft, tracked and wheeled vehicles and troops, as well as observing and adjusting the fall of shot.