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