HaiYang-2B
(HY-2B) is the second marine dynamic environment satellite of China. It
integrates active and passive microwave sensors, and is one of the marine
series satellites. HY-2B 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. The major objective of HY-2B is to
monitor and investigate the marine environment, and obtain marine dynamic
environmental parameters including sea surface wind, wave height, sea surface
height, sea surface temperature, etc. HY-2B could directly provide measured data
for early warning of disastrous sea conditions and provide services for marine
disaster prevention and mitigation, marine rights maintenance, marine resource
development, marine environmental protection, marine scientific research, and
national defense construction.
1. Observation parameters and accuracy
Major observation parameters: sea surface wind, sea surface
height, significant wave height, gravity field, ocean circulation and sea
surface temperature, etc.
Other observation parameters: Sea ice, geoid and water vapor
content.
The observation parameters and application are shown as follows:
Observation parameters
|
Observation parameters |
Application |
|
Major parameters: sea surface
wind, sea surface height, significant wave height, gravity field, ocean circulation
and sea surface temperature; Other
parameters: Geoid, ice
height and water vapor content |
Major application: Sea surface
wind, sea state forecast, storm warning, local sea surface/botton topography,
local ocean gravity field, local geoid, ocean circulation; Other
application: marine dynamic process, large-scale weather process,
precipitation forecasting, surface classification, global change. |
Product accuracy
|
Parameters |
Accuracy |
Measurement range |
|
Wind speed |
2m/s or 10% (@ max value) |
2~24m/s |
|
Wind direction |
20° |
0°~360 |
|
Sea surface height |
~5cm |
|
|
Significant wave height |
0.5m or 10% (@ max value) |
0.5~20m |
|
Sea surface temperature |
±1.0°C |
-2~35°C |
|
Water vapor content |
±3.5kg/m2 |
0~80 kg/ |
|
Cloud liquid water |
±0.05kg/ |
0~1.0 kg/ |
2. Observation areas
(1)
Observation areas:
HY-2B has
global continuous observation capability.
Real-time
areas: 5°S~50°N, 100°E~150°E.
(2) Data
coverage
Scatterometer
(SCA) as the major payload on the marine dynamic environment satellite has a
coverage of not less than 90% in the global sea area for 1 to 2 days.
Repeat period:
14 days & 168 days
3. Orbit characteristics
(1) Orbit characteristics
for 14 days repeat period
Major
semi-axis: 7341.732 km
Inclination: 99.34015
Adjacent track
pitch: 207.64km
Nadir drift: ±1km
Local time at
the descending node: 6:00 am
(2) Orbit
characteristics for 168 days repeat period
Major semi-axis:
7343.851km
Inclination:
99.34015
Adjacent track
pitch: 17.31km
Nadir drift: ±1km
Local time at
the descending node: 6:00 am
4. Payload
(1) Altimeter (ALT)
a. Objective: ALT with external
calibration mode is objective to monitor sea surface height, significant wave
height and gravity, etc.
b. Technical parameters:
Frequency:
13.58GHz, 5.25GHz
Footprint in
limited pulse way: 2km
Ranging measurement accuracy: 2cm (at nadir)
ALT has the
capability of sea and land monitoring.
c. External
calibration mode: output ALT pulse I/Q raw data. The external calibration
process can cover the whole calibration area.
(2) SCA
a. Objective: SCA with external
calibration mode is objective to monitor sea surface wind.
b. Technical parameters:
Frequency:
13.256GHz
Bandwidth
(1dB): 1MHz
Polarization
Mode: HH, VV
Spatial
resolution: 25km
Swath width:
H Polarization: 1350km;
V Polarization: 1700km
Sigma0
measurement accuracy: 0.5dB
Sigma0
measurement range: -40dB~+20dB
(3) Scanning Microwave Radiometer (SMR)
a. Major objective: measure sea surface
temperature, sea surface water vapor content, liquid water and rainfall, etc.
b. Technical parameters:
Sensor specification of SMR
|
Frequency(GHz) |
6.925 |
10.7 |
18.7 |
23.8 |
37.0 |
|
Bandwidth (MHz) |
350 |
100 |
200 |
400 |
1000 |
|
Polarization Mode |
VH |
VH |
VH |
V |
VH |
|
Swath width (km) |
≥1600 |
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|
Ground Inclination |
53 |
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|
Ground Track(km×km) |
90×150 |
70×110 |
36×60 |
30×52 |
20×35 |
|
Sensitivity(K) |
≤0.5 |
≤0.6 |
≤0.5 |
≤0.5 |
≤0.8 |
|
Dynamic range |
3-350K |
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|
Calibration accuracy |
1K(@95~320K) |
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|
Linearity |
>0.999 |
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(4) Correction Microwave Radiometer (CMR)
a. Major objective: provide atmospheric
wet tropospheric path delay correction service for ALT.
b. Technical parameters:
Sensor specification of CMR
|
Frequency (GHz) |
18.7 |
23.8 |
37.0 |
|
Bandwidth(MHz) |
250 |
250 |
500 |
|
Polarization Mode |
Linear Polarization |
||
|
Sensitivity(K) |
0.4 |
0.4 |
0.4 |
|
Calibration accuracy |
1K(@ 120~320K) |
||
|
Dynamic range |
3~300K |
||
|
Linearity |
>0.999 |
||
(5) Automatic Identification System (AIS)
a. Major objective: Detect, demodulate,
and forward AIS messages.
b. Technical parameters:
Frequency:
161.975MHz,162.025 MHz,156.775 MHz,156.825 MHz;
Swath width: ≥1000km.
(6) Data collection system (DCS)
a. Major objective: receiving buoy
measurement data from China's offshore and other sear areas, and transmitting
the data after storing through the satellite digital transmission channel.
b. Technical parameters:
Frequency:
401.65MHz±55kHz;
Modulation: BPSK.
