Raduga communications satellite

In 1975, the Soviet Union announced the launch of the country's first geostationary satellite. Designated Raduga, (Rainbow) it was described as the new step in the developing satellite TV networks in USSR. Many years later, it was revealed that Raduga had also a military role and even had a secret name -- Gran, Russian for Edge.


Technical description

During the Soviet period, the dual purpose of Raduga satellites could've been guessed from somewhat muted descriptions of the system, when compared to the information available on other primarily civilian communications satellites, such as Gorizont and Ekran.

According to the official Soviet sources, the Raduga was designed to support the Orbita ground TV network, as well as provide telephone and telegraph communications across the entire Eastern hemisphere except for polar regions. A post-Soviet source revealed that Raduga carried two three-channel transponders designated Delta-1 and developed under leadership of chief designer V. I. Moguchev and Delta-2 developed by a team under chief-designer M. V. Brodskiy. Delta-1 was designed specifically for military communications, Delta-2 for civilian applications. (70)

Traditionally for Soviet communications satellite projects, the Raduga's overall development was led by NPO PM center in the Siberian town of Zheleznogorsk. The satellite's basic platform, or bus, designated KAUR-3, featured three-axis attitude control system, employing a gyroscope and micro-thrusters. Solar panels could independently track the Sun, eliminating the need to change the orientation of the spacecraft in orbit. (2) In the following years, the KAUR-3 platform became a base for the Gorizont family of satellites.

Raduga specs:

Mass
2,000 kilograms
Number of transponders 2
Dimensions
  • Main body height: 5.5 meters
  • Main cylinder diameter: 2.5 meters
  • Solar array span: 9.5 meters

Deployment

The development of the Raduga spacecraft initiated at the end of the 1960s, outpaced the construction of the launch facilities in Baikonur necessary to support its missions. When the new family of satellites was ready for delivery to the launch site, the construction of a new large processing building 92A-50 on the left flank of the cosmodrome designed to service Proton's payloads, was at its infancy and would not be completed until 1981. The only available room on the left flank was inside a 120-meter long building, occupied by the processing facilities for anti-satellite weapons. The program was run by space defense units, PKO, who resisted the new arrivals. After long wrangling between Chief Directorate of Space Assets, GUKOS, and NIIP-5 officials, Radugas were finally accommodated at the processing hall formerly occupied by one of the Vladimir Chelomei's ballistic missiles. Some auxiliary services had to be "squeezed" to accommodate testing and measuring hardware. The 4th Test Directorate of NIIP-5 took responsibility for the processing of the satellites.

The Raduga was preceded to the geostationary orbit by a test version of the Molniya-1 No. 10 satellite, aka Molniya-S, where "S" stood for "stationary." It was successfully launched on July 29, 1974, becoming the first Soviet payload in the geostationary orbit.

For the Raduga network, the USSR reserved two initial locations in the geostationary orbit at 35 and 85 East longitude.

A single State Commission led by General A. A. Maksimov and from 1978 by General N. F. Shlykov oversaw flight testing of both Molniya-3 and Raduga spacecraft. (70) The system was declared operational in December 1979, along with Molniya-3 system. (76)

(204)(119)(126)

A complete list of Raduga launches

(All launches from Baikonur onboard Proton-K rocket. The 11S86 version of the Block D upper stage was used until the launch of Raduga (21), when the 11S861 modification was introduced. During the last Raduga launch, the Breeze-M (14S43) upper stage was to be tested in flight for the first time, however the mission failed during burn of the second stage):

Launch date
Time of launch
Name
Launch complex
Launch pad
Launch results
3/26/1974
16:35
Raduga
Gran GVM
Cosmos-637
81
23
Success
12/22/1975
16:00
Raduga
Gran
Statsionar-2
81
24
Success
9/11/1976
21:24
Raduga (2)
Gran
Statsionar-1
81
24
Success
7/24/1977
05:00
Raduga (3)
Gran
200
40
Success
7/19/1978
00:59
Raduga (4)
Gran
200
40
Success
4/25/1979
06:44
Raduga (5)
Gran
200
40
Success
2/20/1980
11:05
Raduga (6)
Gran
200
39
Success
10/5/1980
20:10
Raduga (7)
Gran
200
39
Success
3/18/1981
07:40
Raduga (8)
Gran
200
40
Success
7/31/1981
00:38
Raduga (9)
Gran
200
39
Success
10/9/1981
19:59
Raduga (10) No. 20L
Gran
200
39
Success
11/26/1982
17:13
Raduga (11)
Gran
200
39
Success
12/24/1982
15:00
Raduga
Gran
200
40
Failure
4/8/1983
07:45
Raduga (12)
Gran
200
40
Success
8/25/1983
23:02
Raduga (13)
Gran
200
40
Success
2/15/1984
11:46
Raduga (14) No. 25L
Gran
200
39
Success
6/22/1984
03:20
Raduga (15)
Gran
200
39
Success
8/9/1985
00:01
Raduga (16)
Gran
200
39
Success
11/15/1985
17:29
Raduga (17)
Gran
200
39
Success
1/17/1986
13:20
Raduga (18)
Gran
200
40
Success
10/25/1986
18:43
Raduga (19)
Gran
200
40
Success
3/19/1987
06:54
Raduga (20)
Gran
200
40
Success
12/10/1987
14:30
Raduga (21)
Gran
200
40
Success
10/20/1988
18:43
Raduga (22)
Gran
200
39
Success
4/14/1989
07:05
Raduga (23)
Gran
200
39
Success
12/15/1989
14:30
Raduga (24)
Gran
81
23
Success
2/15/1990
10:52
Raduga (25)
Gran
81
23
Success
12/20/1990
14:35
Raduga (26)
Gran
81
23
Success
2/28/1991
08:30
Raduga (27)
Gran
81
23
Success
12/19/1991
14:41
Raduga (28)
Gran
81
23
Success
3/25/1993
05:28
Raduga (29)
Gran
81
23
Success
9/30/1993
20:06
Raduga (30)
Gran
81
23
Success
2/18/1994
10:56
Raduga (31)
Gran
81
23
Success
12/28/1994
14:31
Raduga (32)
Gran
81
23
Success
2/19/1996
11:19
Raduga
Gran
200
39
Failure
7/9/1999
16:31:59
Raduga
Gran
81
24
Failure

*Moscow Decree Time

 

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Last update: July 18, 2024

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Raduga

An official depiction of the Raduga satellite. Credit: ISS Reshetnev