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Tech sheet FEN-YUN 1

Fen-Yun 1 is a low orbit polar satellite, launched by the Chinese National Meteorological Agency. The Fen-Yun 1 series, consisting of satellites 1A, 1B and 1C, were launched between 1988 and 1999.

First image of FENG-YUN 1C

First received image of Feng-Yun 1C

Tech data of the FENG-YUN 1 series

Description Value Value Value Value Unit
Satellite FY-1A FY-1B FY-1C FY-1D
Launch date 1988/09/07 1990/09/03 1999/05/10 2002/05/15
Name before launch n/a n/a n/a n/a
Actual name FEN-YUN 1A FEN-YUN 1B FEN-YUN 1C FEN-YUN 1D
NASA ID 19467 20788 25730 27431
Approximate height 870 870 870 870 km
Orbit inclination 98.85 98.85 98.85 98.85 degrees
Orbit period 102.301 102.301 102.301 102.301 minutes
Frequencies 1700.4 (HRPT?) 1700.4 (HRPT?) 1700.4 1700.4 MHz

Data format

Channel No. Wavelength (micrometer) Primary use
1 0.58-0.68 Daytime cloud, ice and snow vegetation
2 0.84-0.89 Daytime cloud, vegetation, water
3 3.55-3.93 Heat source, night cloud
4 10.3-11.3 SST, day/night cloud
5 11.5-12.5 SST, day/night cloud
6 1.58-1.64 Soil humidity, ice/snow distinguishing
7 0.43-0.48 Ocean color
8 0.48-0.53 Ocean color
9 0.53-0.58 Ocean color
10 0.90-0.965 Water vapor

The CHRPT format (of 1C and 1D) is very similar to the one used for the HRPT images of the NOAA series (according to the chines agency).

- 6 lines are transmitted per second (better, 'data blocks').
- Each 'block' holds one line of each image, or up to 10 lines, transmitted sequentially
- Each line consists of 2048 data words
- Each block holds 10 lines (2048 words each, 20480 total), plus synchronization information and auxiliaty info (1700 words) mas información de sincronismo e información auxiliar (1700 palabras) for a grand total of 22180 words per block.
- Each word is 10 bits long: 6 blocks/sec * 22180 words * 10 bits = 1.3308 Mbps, exactly twice the NOAA transmission rate.
- Modulation is BPSK