DS-U2-GF

In December 1959, the Interdepartmental Scientific and Technical Council for Space Research was created at the USSR Academy of Sciences , headed by Academician M.V. Keldysh , which is charged with developing thematic plans for the creation of spacecraft, issuing key thematic tasks, and coordinating research work and the development of the upper atmosphere and outer space, the preparation of questions of the organization of international cooperation in space research. ^[four]

The member of the Presidium of the Interdepartmental Scientific and Technical Council for Space Research is approved by MK K. Yangel . In the field of applied tasks of carrying out such work, NII-4 of the USSR Ministry of Defense was entrusted. ^[four]

In 1962, the spacecraft “ DS-A1 ”, “ DS-P1 ”, “ DS-MT ” and “ DS-MG ” were included in the second-phase launch program of the launch vehicle “ 63C1 ”. ^[5]

The positive results of the first works, which confirmed the prospect of remote methods for solving scientific and applied problems, stimulated a huge flow of applications for the development of new research spacecraft with various target equipment on board. ^[6]

After conducting search design work on the development of a new modification of research satellites, it became obvious that due to the variety of research tasks and the differences between the requirements for the new series, it was almost impossible to develop a device of the same type. ^[7]

In 1963, it was decided to create three modifications of the unified satellite platform: ^[7]

• DS-U1 - a spacecraft non-oriented in space with chemical energy sources;
• DS-U2 - a spacecraft not oriented in space with solar batteries, as an energy source;
• DS-U3 is a Sun- oriented spacecraft with solar panels, as an energy source.

Small space satellite platforms have become an instrumental base for organizing international cooperation in the field of space exploration under the Intercosmos program.

Corps

The main unit of each modification of the unified platform is a sealed enclosure made of a special aluminum alloy - AMg-6 , which was dictated by the need to ensure certain climatic conditions in the middle of the apparatus. ^{[7] The} cylindrical housing 1.46 m long and 0.8 m in diameter is conventionally divided into three compartments:

• compartment of scientific equipment;
• compartment of the complex of main and auxiliary systems;
• power supply compartment.

Solar panels

The solar battery with a total area of ​​5 m ² is an octagonal prism with four rotary panels. The basis of the solar battery is a stamped frame made of a combination of aluminum and magnetic alloys. ^[8]

On the faces and end surfaces of the frame, stationary solar panels are installed. Four pivot panels are attached to the frame using pivot mechanisms.

In the transport position, the rotary panels of the solar battery are fixed to the frame in a collapsed position. The detachment and installation of solar panels occurs during the separation of the spacecraft from the launch vehicle.

On all modifications of the DS-U2 and DS-U3 satellite platforms, photovoltaic power supply systems with solar panels of silicon photoconverters and electrochemical batteries of silver-zinc batteries operating in buffer charge-discharge modes were used.

Onboard hardware complex

The on-board hardware complex of the spacecraft of the DS-U2-GF type is intended for command-information, energy, climate and service support of the functioning of the target equipment for the spacecraft. ^[9]

The structure of the radio complex includes:

• “ BRKL-B ” - command radio link equipment, is a narrow-band receiver-decoder of signals transmitted from the Earth to convert them into immediate execution commands;
• “ Crab ” - the orbit and telealarm radio monitoring equipment is a transmitter of a highly stable two-frequency coherent radiation signal, which is used by a ground station to

determining the orbital speed of the spacecraft, as well as for transmitting information from telemetry sensors;

• " Tral-P2 " - telecontrol equipment with a memory device "ZU-2S".

The structure of scientific equipment includes:

• " FPK-3 " - a short-wave spectrum filter device;
• " RSR-06 " - X - ray spectrometer ;
• " ZFK-06 " - a stellar photometer of the short-wave region;
• " RIG-113 " - radiation registration equipment;
• " IE-2 " - equipment for assessing the reflection coefficients of mirrors;
• " SGK-58 " - magnetometer;
• sensors of angles of pointing scientific equipment on the Sun.

Also, this spacecraft was equipped with a gas-jet spin system.

The satellite platform of the spacecraft type "DS-U2-GF" was designed to conduct the following scientific experiments:

• study of the short-wave radiation of the Sun and the upper atmosphere in several spectral regions in the region of 1 - 1500 nm; ^[10]
• study of the spectrum of solar radiation in the region of 30 - 300 nm;
• study of short-wave radiation of stars in several spectral regions in the region of 40 - 1500 nm;
• registration of the radiation flux of artificial radiation belts, monitoring of radioactive contamination of the upper atmosphere, as well as the level of radioactivity of the outer surface of the spacecraft's hull;
• study of the influence of various factors of the space environment ( meteorites , cosmic dust , flows of charged particles) on the coefficient of specular and diffuse reflections of mirrors of astronomical instruments.

The following scientific organizations were the customer and director of this scientific experiment:

• State Optical Institute named after S. I. Vavilov (now - GOI ). ^[1] ;
• Crimean Astrophysical Observatory of the Academy of Sciences of the USSR (now - KrAO ).

On the basis of the DS-U2-GF platform, a spacecraft of the Cosmos - Cosmos-262 series spacecraft was developed and launched on December 26, 1968 from the launch pad of the Kapustin Yar cosmodrome. ^[2]

The scientific equipment on board the device managed to obtain and decode the data, which made it possible to establish the direction of the recorded radiation over the entire duration of the experiment. ^[3]

Instrument recordings made it possible to trace bursts and decays of radiation associated with active processes in the outer shells of the sun.

• Cosmos (spacecraft)
• Dnepropetrovsk satellite
• DS-MT
• DS-U2-I
• DS-U2-V
• Design Bureau "South"

• Rockets and spacecraft Design Bureau "Southern" / Under the total. ed. S. N. Konyukhova . - Dnepropetrovsk: LLC “Kolograf”, LLC RA “Tandem-U”, 2001. - T. 1. - 240 p. - 1100 copies. - ISBN 966-7482-00-6 .
• V. Agapov. By the launch of the first satellite of the DS series // Cosmonautics News: journal. - M .: Videocosmos, 1997.- T. 7 , no. March 10-23 , No. 6/147 . Archived February 2, 2014.

• Space launches and events in the USSR and Russia (Neopr.) . Cosmos.info. Date of treatment May 3, 2013.
• Spacecraft Cosmos 49 (neopr.) . Section of the RAS Council on Space. Date of treatment May 3, 2013. Archived May 12, 2013.
• NSSDC Master Catalog Search . NSSDC Master Catalog Search. Date of treatment May 3, 2013. Archived May 12, 2013.