Tselina is a Russian, formerly Soviet, military space-based radio surveillance system. It is capable of determining the exact location of radio-emitting objects and also their type, modes of operation, and how active they are. It is known to be equipped with the three-axis attitude control system, the pressurized instrument section, the deployable boom, providing gravitational stabilization, and the Korvet radio-receiving hardware. The solar panels apparently have one-axis orientation. The top section of the spacecraft consists of a separate pressurized container carrying optical sensors for the high-precision attitude control system. The energy supply system provides 350 Watt of electricity after the launch and around 315 Watt at the end of the lifespan. The attitude control system designed to provide at least five-degree accuracy for roll control and 10-degree accuracy for yaw and pitch control. The angular rotation speed can be maintained with the accuracy of 0.02 degrees per second.