Large Deployable Reflector on Engineering Test Satellite VIII
Transcript of Large Deployable Reflector on Engineering Test Satellite VIII
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Large Deployable Reflectoron
Engineering Test Satellite VIII
Large Deployable Reflectoron
Engineering Test Satellite VIII
Japan Aerospace Exploration Agency
Space Applications Mission Directorate
Satoru OZAWA
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Large Deployable Reflector (LDR)
� What is Engineering Test Satellite VIII?
� What is Large Deployable Reflector?
� Development strategy of LDR
� In-orbit deployment of LDR
� What are Future Space Applications?
Today’s Talk
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What is the Engineering Test Satellite VIII?
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Overview of theEngineering Test Satellite VIII
40m
40m
LDR
for transmission
LDR
for reception
Solar Array Paddle
S bandFrequency
band
Communication satellite
Type
146º E longitude Orbit
10 years (s/c)
3 years (mission)Design life
7.5 kWElectric power
3000 kg on-orbit at start of mission
Mass
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Handheld size terminal
ETS-VIIIN-STAR
Portable size terminal
Objective ofEngineering Test Satellite VIII
Mobile Communication Satellite
LARGE
SMALL
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Target ofEngineering Test Satellite VIII
Aperture [m]
Fre
qu
en
cy [
GH
z]
beam diameter constant
solid
mesh
inflatable
0 5 10 15 20
CS ItalsatARTEMIS
ETS-VI
ETS-VI
AMSC
INTERSAT6
Palapa C
GSTARTDRS
N-STAR
N-STARGalaxy 3
INTERSAT7Telecom2
Telecom2Arabsat2
AMSC
M-SAT
TDRS
ARTEMIS L'GardeACeS
Ka
Ku
C
S
L
1
5
10
30
ETS-VIII
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What is Large Deployable Reflector?
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Overview
About 19m x 17mSize
0.09Hz or moreStiffness
14Number of modules
105kg (reflector)
650g/m2
Weight
Density
2.4mmrms or lessAccuracy
51.2ºOffset angle
13m
(inscribed circle)Nominal aperture
Offset ParabolaType
19m
17m
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Deployable truss
Surface cable(Quartzel)
Surface mesh(Gilded molybdenum)
Tie/Back cables(Quartzel)
Circumference mesh(Gilded molybdenum)
Circumference cables(Quartzel)
Tendon cable
Composition of each module
Support structure
Reflector surface
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Support structure
� Radial truss structure.
� Spring deploys structure.
� Motor controls deployment speed and enables rewind.
4.8m
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Development strategyof Large Deployable Reflector
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Development strategy of theLarge Deployable Reflector
Strategy
� Two main pillars:Module and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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Two main pillarsModule and Analysis
Strategy
� Two main pillars:Module and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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Two main pillarsModule and Analysis
module analysis
Two main pillars
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Modular mesh antenna concept
moduleModular mesh antenna concept
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Deployment force vs. Gravity
Gravity force
Deployment force
Large deployable structure
Gravity >> Deployment force
Errors >> Deployment Force
Unable to evaluatedeployment force
Counter force
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Ground test difficulty evaluation
Unfeasible zone
antenna aperture [m]
DD
T
LDR 14 module
fan-rib
d = 0.5m
1.0m2.0m
unfurlable antenna
VSOP
hoop-column
105
104
103
102
101
0.0 10.0 20.0
LDR 7 module
LDR 1 module
Difficulty of deployment test
gravity forceDDT
deployment force=
� Small aperture for test/manufacturing.
� Large aperture for use.
We apply the modular
mesh antenna concept.
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Development strategy ofLarge Deployable Reflector
High precision deployment analysisanalysis
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Deployment analysis technology for high precision prediction
SPADE Origami/ETS
SPADE was made for high precision deployment analyses by NTT (Nippon Tele-
graph and Telephone Corporation). Currently Orgami/ETS inherits its technology and is still being expanded by JAXA. These software contributed to LDR.
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Update analysis model by ground tests
Strategy
� Two main pillarsModule and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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High accurate surface forming
Strategy
� Two important pillarsModule and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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Analysis precision evaluation by LDREX-2
Strategy
� Two main pillarsModule and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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Analysis precision evaluation by theLDREX-2 in-orbit experiment
Ariane 5ECALauncher
GTOOrbit
7Number of modules
6.5m x 6.5mSize
211 kgMass6.5m
ASAP5(ARINE5 Structure for Auxiliary Payload)
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LDREX-2 deployment procedure and result
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Analysis precision evaluation by LDREX-2
Analysis result agreed with experiment within 10% at almost every angle. The
maximum error is 32% right before full deployment. Analysis simulates well and can be used for in-orbit prediction of LDR.
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Evaluation of Large Deployable Reflector
Strategy
� Two main pillarsModule and Analysis
� Ground tests and Updating analysis model
� High accurate surface forming
� Analysis precision evaluation by LDREX-2
� Evaluation of Large Deployable Reflector
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Worst case analysis results of theLarge Deployable Reflector
The evaluation of in-orbit deployment of LDR with maximum 32% error
considered shows that the deployment force margin is greater than 2. The reflector is guaranteed to deploy through the analysis and LDREX-2.
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In-orbit deploymentof Large Deployable Reflector
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Launch ofEngineering Test Satellite VIII
Final tests
Stacked on fairing Launched on 18 Dec 2006
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Tx LDR deployment
Events ofEngineering Test Satellite VIII
geostationary
drift orbit
regular mode
3 axes stabilized
+Z
+X
+X
+Z
+Z
+X
+X
+Z +Z
+X
Rx LDR deployment
Boom extension
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Deployment sequence
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Deployment (1/2)
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Deployment (2/2)
Deployed Rx LDR Deployed Tx LDR
The in-orbit deployment of Large Deployable Reflectors demonstrated that the
modular mesh antenna concept and the high precision analysis technology are
very effective. Furthermore, it is also confirmed that the surface accuracy
satisfies the specification against thermal environments throughout the year. These methods can be used for various applications.
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Applications of Large Deployable Reflector
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ETS-8
ASTRO-G
30m class LDR
InSAR
Data relay
Applications of theLarge Deployable Reflector
non ellipse
high accuracy
large
one large reflector
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Application toHigh accuracy reflector
ASTRO-G
� Radio astronomy
� 9.26m aperture
� 0.4mmrms surface accuracy for 43GHz observation
The modular mesh antenna concept can achieve the desired accuracy by the
adjustment and measurement of its surface during the manufacture of each module.
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Application toVery large reflector
30m class reflector
� Mobile communication
� 30m aperture
� S band
The modular mesh antenna concept can enlarge deployable reflectors by extending each module’s aperture or increasing the number of modules.
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Application toa variety of missions
InSAR Data relay
The modular mesh antenna concept can be applied to a huge variety of missions
by changing the combination of modules, incorporating high precision modules, increasing the number of modules, and enlarging modules.
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Concluding remarks
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Concluding remarks
� Large Deployable Reflectors mounted on Engineering Test Satellite VIII were successfully deployed.
� The two important pillars of Large Deployable Reflector are the modular mesh antenna concept and the high precision analysis technology.
� The modular mesh antenna concept can be applied to a huge variety of missions, such as radio astronomy missions, interferometericsynthetic aperture radars, communications and broadcastings.
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