HaiYang-2A
(HY-2A) is the first marine dynamic environment satellite of China. It
integrates active and passive microwave sensors, and has high-precision orbit
measurement and orbit determination capabilities, and has the ability to image
global image under all weather conditions during day and night. HY-2A’s main
duty is to monitoring and investigating ocean environment, getting ocean
dynamic and environmental parameters, including sea surface wind, sea wave
height, ocean current, sea surface temperature, etc. HY-2B could directly
provide measured data for the early warning and prediction of disastrous sea
conditions. Moreover, it plays an important role in the marine disaster
prevention and mitigation, marine rights and interest maintenance, marine
resources development, marine environmental protection, marine scientific
research and national defense construction.
In
January, 2007, the study of the HY-2A satellite project was jointly approved by
the National Defense Science and Engineering Commission and the Ministry of
Finance. China Academy of Space Technology which is attached to China Aerospace
Science and Technology Corporation carried out this project. 6:57AM, August 16,
2011, HY-2A was successfully launched by CZ-4B rocket at Taiyuan Satellite
Launch Center.
Mission objectives of HY-2A
satellite
1) Measuring ocean dynamic and environmental parameters, obtaining sea surface wind, marine surface height, significant wave height, gravity field, ocean circulation and sea surface temperature, etc.
2) In-orbit lifetime verification of the traveling-wave tube amplifier developed by China;
3) Verifying the new technology of satellite-ground laser communication link.
Technical indicators of HY-2A
satellite
HY-2A
payloads:
Radar
Altimeter (RA) (Ku & C bands);
Scatterometer
(SM);
Scanning
Microwave Radiometer (RM);
Correction
Microwave Radiometer (RC);
Doppler Orbitography And Radio-positionng Inte-grated By Satellite (DORIS);
Global
Positioning System (GPS);
Satellite
Laser Ranging (SLR).
Satellite and orbit characteristics
|
Orbit type |
Sun-synchronous near-circular
orbit |
|
Inclination |
99.34° |
|
Local time at the descending node |
6:00AM |
|
Altitude |
971km (for three years) &
973km |
|
Nodal period |
104.46 minutes (for three years)
& 104.5 minutes |
|
Repeat period |
14 days (for three years) & 168
days |
|
Design life |
3 years |
|
Mass |
≤1575kg |
|
Satellite dimensions |
8.56m×4.55m×3.185m |
|
Spacecraft precision |
pointing precision of < 0.1° in pitch pointing precision of < 0.03° in roll and yaw |
|
Satellite output power |
1550W |
|
DT band (payload) |
X-band downlink |
|
Downlink rate |
20Mbps |
|
Onboard storage capacity |
120Gbits |
Sensor specification of RA
RA
is used to measure sea surface height, significant wave height, wind speed and
other basic marine parameters.
|
Frequency |
13.58GHz,5.52GHz |
|
Footprint
in limited pulse way |
≤2km |
|
Sea surface precision |
≤4cm (at nadir) |
|
Significant Wave Height Range |
0.5~20m |
Sensor specification of SM
SM
is mainly used for global sea surface wind observation.
|
Frequency |
13.256GHz |
|
|
Polarization Mode |
HH,VV |
|
|
Ground Track |
≤50km |
|
|
Swath |
H Polarization |
≥1350km |
|
V Polarization |
≥1700km |
|
|
Wind speed Accuracy |
2m/s |
|
|
Wind speed Range |
2~24m/s |
|
|
Wind direction Accuracy |
20° |
|
Sensor specification of RM
RM
is mainly used to obtain global sea surface temperature, sea surface wind, atmospheric
water vapor content, water content in cloud, sea ice and rainfall, etc.
|
Frequency(GHz) |
6.6 |
10.7 |
18.7 |
23.8 |
37.0 |
|
|
Polarization Mode |
VH |
VH |
VH |
V |
VH |
|
|
Swath width(km) |
≥1600 |
|||||
|
Ground resolution(km) |
100 |
70 |
40 |
35 |
25 |
|
|
Brightness temperature
sensitivity (K) |
≤0.5 |
≤0.8 |
||||
|
Dynamic Range |
3~350K |
|||||
|
Calibration Accuracy |
1.0K(@180~320K) |
|||||
Sensor specification of RC
RC
is mainly used to provide atmospheric water vapor calibration services for
altimeters.
|
Frequency(GHz) |
18.7 |
23.8 |
37.0 |
|
Polarization Mode |
Linear Polarization |
||
|
Brightness temperature
sensitivity (K) |
0.4 |
0.4 |
0.4 |
|
Calibration Accuracy |
1.0K(@180~320K) |
||
|
Dynamic Range |
3~300K |
||
HY-2A satellite transitions
HY-2A satellite noise testing
