Descriptions of GCOM-W1 AMSR2 Level 1R and Level 2 Algorithms
DEVELOPMENT OF HIGH TEMPERATURE NOISE SOURCE (HTS) FOR ADVANCED MICROWAVE SCANNING RADIOMETER 2...
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Transcript of DEVELOPMENT OF HIGH TEMPERATURE NOISE SOURCE (HTS) FOR ADVANCED MICROWAVE SCANNING RADIOMETER 2...
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MITSUBISHI ELECTRIC CORPORATION PROPRIETARY INFORMATION ANY AND ALL UNAUTHORIZED REPRODUCTION OR DISCLOSURE STRICTLY PROHIBITED
IGARSS2011
Development of High Temperature Noise Development of High Temperature Noise Source (HTS) for Advanced Microwave Source (HTS) for Advanced Microwave
Scanning Radiometer 2 (AMSR2)Scanning Radiometer 2 (AMSR2)
July 28, 2011
Kamakura Works, Mitsubishi Electric Corporation
Tatsuhiro NOGUCHIGCOM-W1
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Contents
1. Introduction (GCOM)
2. AMSR2 Summary
3. HTS Design Concept
4. Evaluation
5. Conclusion
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GCOM: Global Change Observation Mission
1. Introduction (GCOM)
GCOM-W1
Launch
GCOM-C1
Launch
GCOM-W2
GCOM-C2
GCOM-W3
GCOM-C3
GCOM-W1: AMSR2 (Advanced Microwave Scanning Radiometer 2)GCOM-C1 : SGLI (Second-generation Global Imager)
Sensor
Japanese fiscal year 2011 year
(W: Water, C: Climate)5-years
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1. Introduction (GCOM)
GCOM: Global Change Observation MissionAMSR2: Advanced Microwave Scanning Radiometer 2
AMSR2 on GCOM-W1
AMSR2 SU (Sensor Unit)
GCOM-W1
+Y Axisperpendicular direction
to orbit plane
+Z Axisgeocentric direction
+X Axistraveling direction
・ Integrated Water Vapor・ Integrated Cloud Liquid Water・ Precipitation・ Sea Surface Temperature・ Soil Moisture, etc
Observation Data
・ Understand global environment changes Climate prediction models International environmental strategy・ Improve people’s lives Weather forecasting Fishery Information
ContributionAMSR2 CU (Control Unit)
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AMSR2 CUAMSR2 SU
AMSR2 MWA
2. AMSR2 Summary
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Key Parameters of Heritage AMSRSensor
Satellite
Antenna
Freq.GH( z)
BWMH( z) Pol CH Freq.
GH( z)BWMH( z) Pol CH Freq.
GH( z)BWMH( z) Pol CH Freq.
GH( z)BWMH( z) Pol CH
- - - - 6.975 350 VH 2 6.925 350 VH 2 6.9257.3 350 VH 4
- - - - 10.65 100 VH 2 10.65 100 VH 2 10.65 100 VH 2
- - - - 18.7 200 VH 2 18.7 200 VH 2 18.7 200 VH 2
23.8 400 V 1 23.8 400 VH 2 23.8 400 VH 2 23.8 400 VH 2
31.4 500 H 1 36.5 1000 VH 2 36.5 1000 VH 2 36.5 1000 VH 2
- - - - 50.352.8
160380 V 2 - - - - - - - -
- - - - 89-A89-B 3000 VH 4 89-A
89-B 3000 VH 4 89-A89-B 3000 VH 4
AMSR2AMSRMSR AMSR-E
0.5m Antenna (Fixed) 2m Antenna (Fixed) 1.6m Antenna (Deployable) 2m Antenna (Deployable)
MOS-1 (launch:1987)MOS-1b (launch:1990) ADEOS-II (launch:2002) Aqua (launch:2002) GCOM-W1
(scheduled for launch:2011)
6 frequency band, 14 ch 6 frequency band, 16 ch
KeyPara-meters
2 frequency band, 2ch 7 frequency band, 16 ch
2. AMSR2 Summary
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AMSR2 SU
HTS (High Temperature noise Source)
CSM (Cold Sky Mirror)
Feed
Main Reflector
Radiationfrom Earth
2. AMSR2 Summary
1,450km wide scanCalibrate once per each scan (1.5s), using HTS and CSM
Features
1,450km wide scan
1450km
55° 55°
61°
47.5°
AMSR2 observation concept
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3. HTS Design Concept
SL
TL
Low temp.calibration point
TOBS
SOBS
Observationpoint
Brightnesstemperature
Microwavestrength
Calibration MethodCSM
FeedTCP (Thermal Control Panel)
HTS
Uniform temperature of microwave absorbersIrradiate Feed with stabilized brightness temperature
HTS Mission
300
HTS
unit: mmMicrowaveAbsorbers
300
300
(mass:4kg)
SH
TH
High temp.calibration point
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HTS Performance Specification
- Reference temperature of HTS : 20degC- Temperature distribution of Microwave Absorbers : 2.5degC or less
3. HTS Design Concept
T : 2.5degC or less
20degC
HTS
Thermal Design Concepts
- Radiate a constant temperature heat to the microwave absorbers- Insulate microwave absorbers from the external thermal environment
Extremely sever specification
<Comparative example : a normal satellite equipment >
Allowed temperature range : -10 to +50degC
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Heater
Thermal Design (Heater Control)
・ Heater Control of HTS Walls and TCP・ Thermal Radiation from HTS Walls and TCP
Design Concept
Sensor Unit
Radiation heat from TCP
Radiation heatfrom HTS walls
MLI
To supportstructure
*Materials: Aluminum alloy (HTS wall / TCP)*Heater control: All six planes (HTS wall / TCP)
3. HTS Design Concept
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Thermal Design (Thermal Insulation)MLI
•Solar heat power incidence•Outer space radiation heat
・MLI (Multi Layer Insulation)・ TCP and Sun-Shields for HTS・ Thermal insulation spacers
Design Concept Thermalinsulation spacers
Thermalinterface
Thermalinsulation spacers
Shield
Sensor Unit
Shield
3. HTS Design Concept
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4. Evaluation
(1) On-orbit Thermal Analysis
Analysis
AMSR2 Thermal Math Model
(2) IR Method(3) Solar Method
Thermal Vacuum Test
Thermal vacuum test configurations
IR method Solar method
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ItemsHigh temp.
caseLow temp.
case
Orbit
Altitude 699.6km
Inclination 98.186deg
Beta angle 32deg 13deg
Albedo 0.25 0.35
IR 258W/m2 216W/m2
Solar 1421W/m2 1289W/m2
Thermal optical properties EOL BOL
Controltemperature
HTS walls 20degC
TCP 20degC
Interfaceconditions
HTS 27degC 1degC
TCP 34degC -5degC
Feed 0degC 0degC
Thermal Analysis Condition
4. Evaluation
< 2.5degC< 2.5degCSpec.
139.8W91.1WTCP
Avg. power
8.0W2.9WHTS
avg. power
2.0degC1.8degCTemp.
distribution
High temp. case
Low temp. case
Case
Thermal Analysis Result
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18
19
20
21
22
23
0 1000 2000 3000 4000 5000 6000Time s
Tem
pera
ture
deg
C
Microwave absorbers’ temperature trends (high temperature case)
Sunshine SunsetSunset
Temperature fluctuation of feed coversIncidence of solar light from gap between HTS and TCP
Factor of temperature changes of microwave absorbers
4. Evaluation
1560s
1.8degC
3900s
1.5degC
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18
19
20
21
22
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0 1000 2000 3000 4000 5000 6000Time s
Tem
pera
ture
deg
C
Microwave absorbers’ temperature trends
1.8degC < 2.5degC
Temperature fluctuation of feed coversIncidence of solar light from gap between HTS and TCP
Factor of temperature changes of microwave absorbers
1560s
4. Evaluation
Sunset SunsetSunshine
1560s
18.27 20.13
Temperature contour figure
(high temperature case)
Feed cover
Feed cover
[Unit:degC]
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18
19
20
21
22
23
0 1000 2000 3000 4000 5000 6000Time s
Tem
pera
ture
deg
C
Microwave absorbers’ temperature trends
1.5degC < 2.5degC
Temperature fluctuation of feed coversIncidence of solar light from gap between HTS and TCP
Factor of temperature changes of microwave absorbers
3900s
4. Evaluation
[Unit:degC]
Temperature contour figure
(high temperature case)
3900s20.02 21. 57 Sensor Unit
Solar light incidence
Sunset SunsetSunshine
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Temperature Distribution of Microwave Absorbers
・ Case1 Temperature Distribution : 0.6 degC → Complete Validity verification of design concepts ・ Case2 Temperature Distribution : 1.2 degC → Meet performance specification
Conclusion ( Thermal Vacuum Test IR Method)
9.649.68
9.659.55
9.74/9.63/9.19
9.52
9.77
9.009.55
9.70
9.34/9.95/10.1
9.29
9.84/9.89/9.37
9.639.479.05
9.64
9.59
9.57
9.729.05/9.69/9.92
9.74 10.1
10.0/9.97 9.34
9.989.97
9.70
9.76
10.210.1
9.899.88
9.88
10.010.09.29
10.1
9.26
[Unit:degC]Case 2
9.9510.0
9.949.89
9.93/9.93/9.75
9.89
9.99
9.749.90
10.0
9.82/10.1/10.2
9.82
9.94/10.0/9.66
9.879.949.70
9.96
9.95
9.90
10.09.74/9.97/10.0
10.0 10.2
10.0/10.0 9.78
10.110.1
10.0
10.0
10.310.1
9.999.99
10.0
10.010.19.83
10.23
9.67
[Unit:degC]Case 1
4. Evaluation
Items Case 1 Case 2
HTS Walls
10 degC
10 degC
TCP 10 degC
10 degC
Feed Dummy
10 degC
-19 degC
Rotation Yes Yes
Heater Panels
-85 degC
-85 degC
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-0.2
0.0
0.2
0.4
0.6
0.8
1.0
-50 0 50 100 150 200Time s
Tem
pera
ture
deg
C
-400
0
400
800
1200
1600
2000
Sol
ar l
ight
int
ensi
ty W
/m 2
Temperature Trends of Microwave Absorbers
0.3 degC << 2.5 degC
・ Temperature increase of microwave absorbers within Solar light incidence (150s) 0.3 degC max → negligible in orbit operation
Conclusion( Thermal Vacuum Test Solar Method)
4. Evaluation
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・ Validity verification of the thermal design concepts of HTS was conducted by thermal analysis on orbit and thermal vacuum tests of development model
・ Specification of temperature distribution : 2.5degC or less
Design result: 1.8degC at high temperature case
2.0degC at low temperature case
・ Calibration and measurement performance of AMSR2 will be improved more than a previous model.
Conclusion
5. Conclusion
・ Launch within Japanese fiscal year 2011・ On-orbit evaluation
Future plan
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FIN
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AMSR2 Block Diagram
SENS UNIT (SU) CONT UNIT (CU)
DC/DCRX1-BDC/DC
RX1-A
CONTROL UNIT (CU)SENSOR UNIT (SU)
LNA-VLNA-H
LNA-VLNA-H
RX-VRX-H
RX-VRX-H
SPS
MWA-A
ADE-BADE-A
SPC-BSPC-A
Structure Structure
Integration PartsIntegration PartsRelease Bolt CatcherRelease Bolt Catcher
CSM
HTS
CAL ASSY
Deployment Structure
Antenna
Main Reflector
衛星システム
6.9GHz7.3GHz
10.65GHz
36.5GHz
89GHz-A
89GHz-B
18.7GHz23.8GHz
Feed
Separation Device Separation Device
EED
OBM-XV OBM-XH OBM-YHOBM+YV
TCS
Heater
TCC
Heater
10/18/23/89-A
DC/DCRX2-B
DC/DCRX2-A
6/36/89-B
GCOM-W1Satellite
Cable
MDC dataPCD dataTLMCMD
RX-VRX-H
RX-VRX-H
RX-VRX-H
RX-VRX-H
RX-VRX-H
Receiver
PDUC 1
ADM
PDUS
RX-VRX-H
MWA-B
PDUC 2 BUS
BUS
LNA-VLNA-H
LNA-VLNA-H
LNA-VLNA-H
RX-VRX-H
RX-VRX-H
SPS
MWA-A
ADE-BADE-A
SPC-BSPC-A
Structure Structure
Integration PartsIntegration PartsRelease Bolt CatcherRelease Bolt Catcher
CSM
HTS
CAL ASSY
Deployment Structure
Antenna
Main Reflector
衛星システム
10.65GHz
36.5GHz
89GHz-A
89GHz-B
18.7GHz23.8GHz
Feed
Separation Device Separation Device
EED
OBM-XV OBM+XH OBM-YHOBM+YV
TCS
Heater
TCC
Heater
DC/DCRX2-B
DC/DCRX2-A
6/36/89-B
GCOM-W1Satellite
BUS
Cable
MDP dataTime dataTLMCMD
RX-VRX-H
RX-VRX-H
RX-VRX-H
RX-VRX-H
LNA-VLNA-H
Receiver
PDUC 1
ADM
PDUSDC/DCRX2-B
DC/DCRX1-A
Thermal Control Panel
DIV
Back-up Chart
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Item
Observation Frequency (GHz) 6.925 7.3 10.65 18.7 23.8 36.5 89 (A) 89 (B)
Band Width (MHz) 350 350 100 200 400 1000 3000 3000
Polarization
Temperature Resolution (K) 0.34 0.43 0.7 0.7 0.6 0.7 1.2 1.2
Dynamic Range (K)
Off-Nadia Angle deg( )
Swath Width (km)
Scan Period (sec)
Beam Width (deg) 1.8 1.8 1.2 0.65 0.75 0.35 0.15 0.15
IFOV [Az x El] (km) 35 x 61 35 x 61 24 x 41 13 x 22 15 x 26 7 x 12 3 x 5 3 x 5
Beam Efficiency (%) >90 >90 >90 >90 >90 >90 >90 >90
Sampling Interval (km) 510
Performance
V/H
2.7 340~
47.5
1450
1.5±1% (40rpm)
Key Performance of AMSR2
Back-up Chart
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Back-up Chart
NEDT Comparison for AMSR-E/AMSR2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
H V H V H V H V H V H V H V H V
6.9G 6.9G 7.3G 7.3G 10G 10G 18G 18G 23G 23G 36G 36G 89GA 89GA 89GB 89GB
ΔT[K
]
AMSR-E PFM Measured Data AMSR-E On-Orbit Data AMSR2 PFM Measured Data