Fanhui Shi Weixing

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Fanhui Shi Weixing (simplified Chinese: 返回式卫星; traditional Chinese: 返回式衛星; pinyin: Fǎnhuí Shì Wèixīng; literally: "recoverable satellite") is a series of Chinese recoverable reconnaissance satellites. The satellites were used for both military and civilian observation needs, with a total of 26 flights. The first flight was FSW-0 on 1969-06-01 and the last SJ-8 on 2006-09-09.

Four models of the satellites were introduced: FSW-0, FSW-1, FSW-2, and the most modern being FSW-3. All satellites were put in orbit using the Long March rockets, most of them by the CZ-2C type.

A novel feature of the spacecraft's reentry module was the use of a natural material, impregnated oak, as the ablative material for its heat shield.[1]

Successful achievement of landing technology (third in the World after Soviet Union and United States) was the basis for the second Chinese manned space programme (period of 1978-1980), third manned programme Project 863 (late 1980s), and current Shenzhou programme (since 1992).[citation needed]

History

China started developing this kind of satellite in the early 1970s. On 26 November 1975, China launched the first FSW satellite from Jiuquan in Inner-Mongolia. The satellite finished its mission successfully on 29 November 1975 and returned to earth safely, with the landing location in a special zone (Liuzhi Special District; 六枝特区) of Guizhou Province.[2] It was the first Asian atmospheric reentry mission, and China became the third country to recover a satellite after its mission.[3]

There are mainly three generations in history: FSW-0; FSW-1; FSW-2 and the current FSW-3. Until the year 2003, China launched in total 22 of this kind of satellite, for climate, geographical and agricultural purposes.

Variants

  • FSW-0

It was the first generation of China's returnable satellites. The main use was for the inspection of national land and natural resources. Satellites of this generation all carried prism-scan cameras. It did not have any complete orbit control system, so its decay or attenuation of orbit was fast; it thus had a relatively short orbit duration. Its accuracy for landing or return location was relatively low.

  • FSW-1

This generation carried much more powerful cameras. The main use of this generation was for drawing geographical maps. Its resolution was as high as 10m.

  • FSW-2
  • FSW-3
FSW-0 FSW-1 FSW-2 FSW-3
Satellite Mass (km) 1800 2100 2800~3100
Satellite Volume (m3) 7.6 7.6 12.8
Return Load (kg) 260 260 400
Launch Load (kg) 340 450 500~600
Mission Duration (day) 3~5 8 15~17
Microgravity Gradient (g) 10−3~10−5 10−3~10−5 10−3~10−5
Orbital Inclination (°) 57~68 57~70 57~70
Periapsis (km) 172~180 200~210 175~200
Apoapsis (km) 400~500 300~400 300~400
Orbit Period (min) ~90 ~90 ~90
Launch Rocket Type Long March C Long March C Long March D Long March C or D

Manned flights

Due to lack of information both about origins of FSW and about second manned space programme (that was announced few times in 1978 with the open publishing of some details including photos, but then was abruptly cancelled in 1980), first model FSW-0, probably, was designed initially for manned use as spacecraft instead of first manned programme Shuguang aborted in early 70s.[4]

The West were suggesting that after dozen of mostly successful launches of FB-1 and CZ-2 rockets and 4 successful annual launches of FSW (last one in January 26, 1978 claimed as dress rehearsal) China made in December, 1978 (or on January 7, 1979 according to another unconfirmed sources) the first attempt of launch of manned version of FSW spacecraft, but due to fail with loss of astronaut this program was closed, and the FSW satellite (redesigned for unmanned goals as subsequent models) only retrieved a flight in 1982.[5]

Launches

Name Launch Date (y/m/d) Return Date (y/m/d) Launch Load (kg) Return Load (kg) Apsis (km) Apogee (km) Period (min) Angle(°)
FSW-0-1 1974/11/5 failed 1790 - - - - -
FSW-0-2 1975/11/26 1975/11/29 1790 600 181 495 91.2 63.0
FSW-0-3 1976/12/7 1976/12/10 1790 600 172 492 91.2 59.5
FSW-0-4 1978/1/26 1978/1/29 1810 650 169 488 91.2 57.0
FSW-0-5 1982/9/9 1982/9/14 1780 610 177 407 90.2 63.0
FSW-0-6 1983/8/19 1983/8/24 1840 630 175 404 90.2 63.3
FSW-0-7 1984/9/12 1984/9/17 1810 620 178 415 90.3 68.0
FSW-0-8 1985/10/21 1985/10/26 1810 620 175 409 90.2 63.0
FSW-0-9 1986/10/6 1986/10/11 1770 610 176 402 90.2 57.0
FSW-0-10 1987/8/5 1987/8/10 1810 650 172 410 90.2 63.0
FSW-1-1 1987/9/9 1987/9/17 2070 610 208 323 89.7 63.0
FSW-1-2 1988/8/5 1988/8/13 2130 640 208 326 89.7 62.8
FSW-1-3 1990/10/5 1990/10/13 2080 650 206 308 89.6 57.1
FSW-2-1 1992/8/9 1992/8/25 2590 640 175 353 89.1 63.1
FSW-1-4 1992/10/6 1992/10/13 2060 600 211 315 89.8 63.0
FSW-1-5 1993/10/8 return failed 2100 (650) 214 317 89.6 56.9
FSW-2-2 1994/7/3 1994/7/18 2760 770 178 333 89.5 62.9
FSW-2-3 1996/10/20 1996/11/4 2970 770 176 354 89.7 63.0
FSW-3-1 2003/11/3 2003/11/21
FSW-3-2 2004/8/29 2004/9/25
FSW-3-3 2004/9/27 2004/10/15
FSW-3-4 2005/8/2 2005/8/29
FSW-3-5 2005/8/29 2005/10/17
SJ-8 2006/9/9 2006/9/24 3000 173 336 89.60 63.0

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 1975年：第一颗返回式卫星发射 (Year 1975: The Launch of the First Returnable Satellite; from www.gmw.cn)
  3. ↑ 返回式卫星 (China's First Returnable Satellite, from the website of the Central Government of P.R.China)
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found. http://www.astronautix.com/articles/chidoors.htm

Bibliography

External links

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