Sterkh was developed as a replacement for the older Nadezhda system. Unlike their predecessors, Sterkh satellites did not carry navigation systems, since this function had been taken over by GLONASS. Sterkh satellites were smaller than their predecessors and were designed to be launched as secondary payloads with other satellites.
The satellites had a mass of 160 kg. Their overall dimensions were 750 x 1350 x 2000 mm in shipping condition, and 976 x 2957 x 10393 mm in operational condition, with opened solar panels and risen gravitational bar. The satellites incorporated the air-borne radio rescue complex RK-SM. They were expected to have an operational lifetime of 5 years. The satellites were designed and manufactured by Production Corporation Polyot.
- "Sterkh 2 - NSSDC ID: 2009-049B". NASA NSSDC.
- "Small spacecraft "Sterkh"". PO Polyot. Retrieved 2009-09-20.
- Yang, Fang (2009-07-21). "Russia launches two satellites". Xinhua. Retrieved 2009-07-21.
- "Soyuz-2.1b Successfully Lifts Off From Baikonur". Roscosmos. 2009-09-17. Retrieved 2009-09-18.[dead link]
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