 The JY-9 has high anti-jamming and anti-clutter capability due to the use of advanced techniques, including pulse to pulse frequency agility, dual channel, JATS, wide operating band, low sidelobes, MTD automatic spectrum processing, automatic clutter map and automatic residue map.The mean time between failures is better than 900 hours with Built-in test equipment (BITE).The JY-9F three-dimensional low-altitude surveillance radar, is a new derivation of the JY-9 low-altitude radar.