2D Low Level Light Weight Radar (LLLWR) is a light weight battery powered compact sensor which provides 2D surveillance in mountainous terrain against hostile aerial targets like UAVs, RPVs, helicopters and fixed wing aircraft flying at low and medium altitudes. The radar can be transported by vehicles, animals, group of men or as helislung loads. It can be dismantled into packages to facilitate quick relocation and installation in mountainous terrain. It acts as an early warner to air defence weapon systems employed to provide protection to vulnerable areas or vulnerable points. The radar detects and tracks short-range air-to-ground threats with a high probability of detection. The radar has an integrated IFF that can detect, confirm, classify and attain IFF status on every target in the battle space under surveillance. The radar has an integral GPS and it supports display of tracks over tactical map overlay. The radar with modular architecture, ruggedness as per Mil standards can be operated in varied conditions including extreme climatic and geographical conditions and in battlefield situations.