環境観測技術衛星(
ADEOS-Ⅱ)
「みどりⅡ」の運用異常について
平成
16年10月21日
宇宙航空研究開発機構
宇宙利用推進本部
黒崎忠明
3
打ち上げ
打ち上げ
ADEOS-II は、 2002年12月14日
10:31:00 に種子島宇宙センターから
H-IIAロケット4号機で打ち上げ。
打ち上げ
16分 32秒後, ADEOS-II は
オーストラリア上空で予定の軌道に
正確にロケットから切り離された。
.
0.01
98.68
98.67 (+/- 0.25)
Inclination [degree]
0
0.001
0.001 (0 – 0.004)
Eccentricity
0
7190
7190 (+/- 20)
Semi major axis [km]
Error
Result
4
ADEOS
ADEOS
-
-
II
II
の ミッション
の ミッション
Advanced Earth Observing Satellite (ADEOS)
Advanced Earth Observing Satellite (ADEOS)
「
「
みどり」の観測ミッションを継承。
みどり」の観測ミッションを継承。
地球温暖化等のグローバルな環境変動のメカニズム
地球温暖化等のグローバルな環境変動のメカニズム
の把握など世界的な気候変動研究に役立てるとともに、
の把握など世界的な気候変動研究に役立てるとともに、
気象や漁業等の実利用の面への貢献。
気象や漁業等の実利用の面への貢献。
•
•
水・エネルギー循環過程、炭素循環の解明を目的とした
水・エネルギー循環過程、炭素循環の解明を目的とした
センサー(
センサー(
GLI
GLI
、
、
AMSR)
AMSR)
の搭載
の搭載
•
•
環境省(
環境省(
MOE)
MOE)
、
、
米国航空宇宙局/ジェット推進研究所
米国航空宇宙局/ジェット推進研究所
(
(
NASA
NASA
/
/
JPL)
JPL)
、
、
仏国立宇宙研究センター(
仏国立宇宙研究センター(
CNES)
CNES)
が提
が提
供したセンサーを搭載
5
Main Characteristics of ADEOS
Main Characteristics of ADEOS
-
-
II
II
Dimension(Approx.)
Main Body
:
6m×4m×4m (X-axis×Y-axis×Z-axis)
Solar Array Paddle
: 3m×24m
Total Mass
: 3.68t
Mission Instrument Mass: 1.23t
Electrical Power
: 5,350W
(End of Life)
Designed life
: 3years
Orbit
: Sun-synchronous sub-recurrent orbit
Altitude
: 802.92km
Orbit Inclination
: 98.62゜
Period
: 101 minutes
Recurrent Period
: 4 days
Local Sun Time
at Descending Node
:
AM 10:30
Launch Site
:
Tanegashima Space Center
Launch Vehicle
:H-IIA Rocket
Launch Date
: 14, December, 2002
+
+
Z
Z
+
+
Y
Y
+
+
X
X
ADEOS
6
ADEOS
ADEOS
-
-
II
II
Flight Configuration
Flight Configuration
GLI
GLI
Global ImagerGlobal ImagerIOCS
IOCS
Inter Orbital Inter Orbital Communication Subsystem Communication SubsystemAMSR
AMSR
Advanced Microwave Advanced Microwave Scanning Radiometer Scanning RadiometerVMS
VMS
Visual Monitoring System
Visual Monitoring System
DTL
DTL
Direct Transmission For Local Users
Direct Transmission For Local Users
PDL
PDL
Paddle Assembly Paddle AssemblyILAS
ILAS
-
-
Ⅱ
Ⅱ
Improved Limb Atmospheric Spectrometer
Improved Limb Atmospheric Spectrometer--ⅡⅡ
C&DH
C&DH
Communication & Data
Communication & Data
Handling Subsystem Handling Subsystem
Seawinds
Seawinds
POLDER
POLDER
Polarization and Directionality
Polarization and Directionality
of the Earth
of the Earth’’s Reflectances Reflectance
ESA
ESA
Earth Sensor Earth Sensor Assembly Assembly
DT
DT
Direct
Direct
Transmission
Transmission
Subsystem
Subsystem
D
D
CS
CS
Data Collection
Data Collection
System
System
AOCS
AOCS
Attitude and Orbit
Attitude and Orbit
Control Subsystem Control Subsystem
MDP
MDP
Mission Data Mission Data Processing Processing Subsystem Subsystem+
+
Z
Z
+
+
Y
Y
+
+
X
X
Direction of Earth
Direction of Earth
7
Results of Mission Operations
Acquired Data
• GLI 1km
:93,338 scenes
• GLI 250m :10,601 scenes
• AMSR
:6,649 scenes
• ILAS-II
:3,450 downlink segments
• SeaWinds :3,728 downlink segments
• POLDER :3,287 downlink segments
Data processing and scientific research are continuing.
Scientific results can be seen in ;
http://sharaku.eorc.jaxa.jp/ADEOS2/index.html
高
9
10
11
13
14
Block Diagram for Electrical System
15
Fault Tree Analysis
[FACTS]
• Generation power dropped by 100 W step
• Similar behavior in both power circuit sides
• Temperature decreased at PDM
• No anomaly in PDL stroke and tension telemetry
[FTA]
• Fault Tree Analysis has provided the possible
locations;
1) Solar Array Paddle
16
FGAN Image
17
Hypotheses
1) Solar Array Paddle
1-1) Short between Cell and Harness
1-2) Short in Blanket joints
1-3) Open in Blanket joints
1-4) Short between Cells
2) Solar Array Paddle Harness
2-1) Short in Harness by discharge
2-2) Open in Harness by discharge
2-3) Short in Harness by mechanical reasons
2-4) Open in Harness by mechanical reasons
18
Hypothesis 1-1
Short between Cell and Harness
Cover glass
adhesive
interconnector
cell
adhesive
polyimide
Adhesive/harness
polyimide
Discharge occurred between cell and harness at damaged polyimide in
Laboratory tests.
One circuit was shorted, however no propagation was observed.
19
Hypothesis 1-2 and 1-3
Short / Open in Blanket joints
Discharge occurred between lands in joint
of blanket in laboratory tests.
20
PDM
module
Discharge between modules
Blanket 1 Blanket 2 Blanket 3 Blanket 48 Blanket 49 Blanket 50 Circuit 2 Circuit 4 Circuit 62 Circuit 64
Circuit 63 Circuit 61 Circuit 3 Circuit 1 Blank blanket Blank blanket Over 1.1mm
Discharge occurred between modules in laboratory tests when voltage potential was greater than 130V. No propagation was observed. .
21
Hypothesis 2-1 to 2-4
22
Hypothesis 2-1 to 2-4
Solar Array Paddle Harness
Solar Array Paddle Bundled harness for 52 power circuits Bundled harness for 12 power circuits Bundled harness MLI Sun
Tie down every 15 cm
MLI surrounding harness did NOT ground. MLI might be charged up when
spacecraft passed auroral bands.
23
24
Scenario for Hypothesis 2-1 and 2-2
[Before 24 October 2003]
Trigger Arc from MLI to
cracked harness
charred
insulator
H1 H2 R R R R R R H1 H1 H1 H2 H2MLI
Propagation
R H1 H2 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2[24 October 2003]
Sustained Arc (Arc tracking)
between charred harnesses
R H1 H2 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 R H1 H2 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2
Destroy whole bundle
25
Temperature of Harness
Analysis Measurement dummy structure Harness on boom Heater panelHighest temperature of the harness might be 230 degree C. Temperature rating for the harness is 200 degree C.
High temperature produced outgas and discharge might occur easily.
26
Cracks on Harness Insulator
Cracks were found on harness insulator after thermal cycle laboratory
test. (100 – 250 degree C)
27
Energetic Electron on 24/10/2003
28
Laboratory Discharge Test Configuration
MLI
V
p1C
extV
bR
b V1 (SAS) 60V,2AV
pV
p2 V2 60V,2AV
p10 V10 60V,2ACracks
HeaterChamber
Thermo couple
29
30
Laboratory Discharge Test Result
0 1 2 3 4 5 6 7 8 9 10 -5 0 5 10 15 20 25 30 経過時間[秒] 動作回路 数 ※ハーネスのHOT/RTN間電圧が50Vを上回っている回路を「動作回路」と定義した