Haiyang-1A(HY-1A)
is China’s first experimental operational satellite that is used for the
monitoring of ocean color. There are two instruments onboard, one is the
10-bands Chinese Ocean Color and Temperature Scanner (COCTS), the other is the
4-bands CCD imager.
At 9:50 am May 15th ,2002 (Beijing Time), HY-1A was launched together with FY-1D by Long March-4B rocket at Taiyuan Satellite Launch Center, after 7 times changing orbits, it reached its schedule orbit on May 27th ,2002, and its instruments started earth observation as schedule on May 29th ,2002.
1.
Satellite and orbit
characteristics
|
Orbit type |
Sun-synchronous near-circular
orbit |
|
Altitude |
798km |
|
Inclination |
98.8° |
|
Local time at the descending node |
8:53~10:10AM |
|
Nodal period |
100.8 minutes |
|
Repeat period |
3 days for COCTS and 7 days for
CZI |
|
Mass |
368kg |
|
Attitude control |
Three-axis stabilized |
|
TT&C communication band |
S-band |
|
DT band (payload) |
X-band downlink |
|
Downlink rate |
5.3232Mbps |
|
Onboard storage capacity |
80MB |
|
Design life |
2 years |
2.
Observation parameters
and areas
Observation
parameters:
Major
observation parameters: Ocean optical characteristics, chlorophyll
concentration, sea surface temperature, suspended sediment concentration,
dissolved organic matter, pollutants, etc.
Other observation
parameters: sea ice, shallow sea topography, ocean current, aerosols, etc.
Observation areas:
Real time
observation areas: Bohai, Yellow
Sea, East China Sea, South China Sea and coastal zone, etc.
Delayed time observation areas: global (only for COCTS).
3.
Sensor onboard HY-1A
(1)
COCTS
① Purpose: monitoring ocean color (chlorophyll
concentration, suspended sediment concentration, dissolved organic matter) and sea surface temperature, etc.
② Sensor specification
Spatial resolution at nadir: 1100m
Pixels per scan line: 1024
Data
quantization: 10 bits
Radiometer
accuracy: 10% at visible band
|
No. |
Band (um) |
Observation
objective |
|
1 |
0.402~0.422 |
Yellow
substance, water pollution |
|
2 |
0.433~0.453 |
Absorption
of chlorophyll |
|
3 |
0.480~0.500 |
Chlorophyll,
sea water optics, sea ice, pollutants, shallow sea topography |
|
4 |
0.510~0.530 |
Chlorophyll,
water depth, sediment of low concentration |
|
5 |
0.555~0.575 |
Chlorophyll,
sediment of low concentration |
|
6 |
0.660~0.680 |
Peak
of fluorescence, sediment of high concentration, pollution, atmospheric
correction, aerosols |
|
7 |
0.730~0.770 |
Atmospheric
correction, sediment of high concentration |
|
8 |
0.845~0.885 |
Atmospheric
correction, water vapor |
|
9 |
10.30~10.40 |
Sea
Surface Temperature, sea ice |
|
10 |
11.40~12.50 |
Sea
Surface Temperature, sea ice |
(2)
CZI
① Purpose: mainly
used for dynamic monitoring of coastal zones to obtain higher resolution images
of sea-land interaction areas.
② Specification
Spatial resolution at nadir: 250m
Pixels per scan line: 2048
Deviation of center
wavelength: ≤ 5%
|
No. |
Band (um) |
Observation objective |
|
1 |
0.42~0.50 |
pollution, vegetation, ocean
color, sea ice, underwater topography |
|
2 |
0.52~0.60 |
sediment, pollution, vegetation,
sea ice, wetland |
|
3 |
0.61~0.69 |
sediment, soil, water vapor |
|
4 |
0.76~0.89 |
soil, atmospheric correction, water
vapor |
