The development of spacecraft for electronic surveillance of radar systems was split into two phases:

Phase 1 included development of electronic surveillance spacecraft, based on experience in developing the unified DS-U1 and DS-U2 spacecraft, and launch of two experimental DS-K 40 spacecraft. Both launches were unsuccessful due to launch vehicle failure. Phase 2 included development of electronic surveillance spacecraft for the Tselina system. The spacecraft incorporated much lighter payload instrumentation based on microcomponents.

The Tselina-О, Tselina-D, Tselina-2, and Tselina-R spacecraft met all objectives of electronic surveillance.

Tselina-О

Mass, kg

339…434
Active life, months 6
Launch vehicle 11К65М
Main experimental results Electronic surveillance. The Tselina-O spacecraft was upgraded. New instrumentation was provided for Tselina-OM and Tselina-OK spacecraft.
Orbited on

30 October 1967

Tselina-D

Mass, kg

1750
Active life, months 6
Launch vehicle 8А92M, 11K68
Main experimental results Close electronic surveillance
Orbited on

18 December 1970

Tselina-R

Mass, kg

1750
Active life, months 6
Launch vehicle 11K68
Main experimental results

Radio source observation

Orbited on

10 December 1986

Tselina-2

Mass, kg

3250
Active life, months 12
Launch vehicle 8А82К, 11К77
Main experimental results

Electronic surveillance

Orbited on

28 September 1984

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