Tselina-2 (11F644)

Type / Application: ELINT Operator:   Contractors: KB Yuzhnoye (bus), TsNIRTI Minradioprom (ELINT payload) Operator: - Configuration: - Lifetime: 1 year Mass: 3200 kg Orbit: 850 km x 850 km, 71.0° (typical)

Tselina-2

Description:

• The Tselina-2 (11F644) series of ELINT satellites were replacements for the first generation system. Based on the first generation Tselina-D ELINT, TSNII-KS at the beginning of the 1970's developed the specifications for an improved model with increased frequency range and on-board method of determining the position of fixed transmitters. The original Tselina-2 design was authorised in March 1973 and handled by prime contractor TsNIRTI Minradioprom for the ELINT equipment and KB Yuzhnoye for the spacecraft bus.
• The new specification for a universal Army-Navy system called for a satellite with increased mass and lifetime. This would be launched by the Zenit-2 booster, replacing the separate earlier-generation systems. Data transmission was directly to ground stations via geosynchronous communications satellites.
• Delays in development of the Zenit-2 launch vehicle resulted in launching the first two trials flights by Proton-K Blok-DM-2 booster in 1984 and 1985.
• Tselina-2 is 3-axis stabilized with addition of a gravity gardient boom, basicly an enlarged version of the Tselina-D bus.
• US-PM will be replaced by the new Liana ELINT satellites.

Launch list: