China’s CETC Unveils S-band YLC-48 Radar GDC 3 years ago An S-band 3D TWA low-altitude surveillance radar developed by China Electronics Technology Group Co is on display at the 9th World Radar Expo in Nanjing, East China’s Jiangsu Province on April 23, 2021. Photo: Cui Meng/GT You need to be logged in to view this content. Please Log In. Not a Member? Join Us