The "Danube-2" long-range detection radar is mainly used to detect incoming enemy ballistic missile targets, calculate its three-dimensional coordinates (separation distance, azimuth angle, altitude angle) and flight trajectory, and send target indication information transmitted to precision guidance radar. The chief designer of the "Danube-2" long-range detection radar is В-П-Sosulnikov.
The "Danube-2" long-range detection radar is a meter-wave radar, which consists of an antenna system, a transmitter, a receiver, indicating equipment, automatic target tracking equipment, and coordinate measuring equipment. The various systems of the "Danube-2" long-range detection radar are deployed in a dispersed manner, with a distance of about 1 kilometer between the antenna system and the transmitting and receiving equipment. The transmitting antenna has a parabolic cylinder shape and a size of 8 meters × 150 meters. It is equipped with two slot waveguide radiators. The transmitting antenna forms two directional patterns in space, with a beam width of 0.6 degrees × 12 degrees.
The receiving antenna consists of two rows of antennas, with a size of 20 meters × 150 meters, and is equipped with 2 pairs of slot waveguide radiators. The receiving antenna forms a pattern in space with a beam width of 0.6 degrees × 12 degrees. The transmitter of the "Danube-2" long-range detection radar consists of two transmitters, each of which has a radiation power of 40 kilowatts.