speaker: yi-fan chang advisor: prof. jian-jiun ding 2012/12/07
TRANSCRIPT
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An Introduction toFORMOSAT-3/COSMIC
Speaker: Yi-Fan ChangAdvisor: Prof. Jian-Jiun Ding2012/12/07
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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Introduction
Name: FORMOSAT-3/COSMIC (Constellation
Observing System for Meteorology, Ionosphere, and Climate).
Objective: Demonstrate the value of near-real-time GPS
Radio Occultation(掩星 ) observations in operational numerical weather prediction.
Major participants: UCAR, OSC, NSF, JPL, NRL, AFRL, NSPO
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Introduction
Characteristics : Number: 6 identical LEO satellites (FM1-
FM6) Shape: Disc-shaper of 103cm diameter,
16cm in height Weight: 62 Kg (include fuel) Design & Mission life: 5 years Launch date: 2006/04/15
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Introduction
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Introduction
Characteristics : Orbit: 516 Km -> 700-800 Km (FM3: 711
Km) Inclination Angle: 72 degrees Argument of Latitude: 30 degrees apart
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Introduction
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Introduction
Provide: 1500~2000 atmospheric and
ionospheric sounding profiles per day Benefits:
Increase the accuracy of the predictions of hurricane/typhoon/cyclone behavior.
Improve long-range weather forecasts. Monitor climate change with
unprecedented accuracy.
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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System and Mission Overview Three onboard payloads:
GPS Occultation Receiver (GOX) (GPS掩星接收器 )▪ 4 GPS antenna (POD1, POD2, OCC1, OCC2)▪ Receive the signals of L1 and L2-band frequency
Tri-Band Beacon (TBB) (三頻段信標儀 )▪ 150, 400, 1067 MHz▪ High resolution 4-D total electron content
Tiny Ionospheric Photometer (TIP) (小型電離層光度計 )
▪ 135.6 nm
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System and Mission Overview
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System and Mission Overview
TBB chains
Multi-Mission Center(MMC), Taiwan
FiducialNetwork
FORMOSAT-3L1&L2
GPS
TT&C, Taiwan
Injection Orbit
Users
TBB signal
Command & telemetry
NMC/USN
CDAAC/UCARBoulder,CO
GPS
Payload science data
L1&L2
Remote Terminal Stations (RTS)
Fairbanks, US and Kiruna, Sweden
TACC/CWBTaipeiUsers
Ground System
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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GPS Radio Occultation
GPS system: Number: 30 satellites up Orbit: 20200 Km Each orbit contains at least 4 satellites Needs 4 satellites for 3D positioning L1 and L2-band frequency carrier wave
▪ 10.23MHz --> 1.58GHz and 1.23GHz
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Occulting LEO
Occulting GPS
Calibrating GPS
Ground receiver
Ionosphere
Neutral atmosphere
Earth
GPS Sat.
GPS Sat.
GPS Sat.
GPS Satellite
Formosat-3/COSMIC Satellite
Formosat-3/COSMIC Orbit
Radio Wave
Occulting LEO
Occulting GPS
Calibrating GPS
Ground receiver
Ionosphere
Neutral atmosphere
Earth
GPS Sat.
GPS Sat.
GPS Sat.
GPS Radio Occultation
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GPS Radio Occultation
GPS satellite
Earth
Ionosphere
Neutral atmosphere
α
LEO satellite
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GPS Radio Occultation
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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Current Status
Spacecraft State GOX TIP/TBB
Remarks
FM1 Battery Degradation POD1 Invalid OFF Bad Attitude
FM2 Power Shortage POD2 Invalid OFF GOX Reboot Loop
FM3SADA Stuck
In coma since July 6, 2010
POD1 Invalid N/ASometimes loss of communication
30% Power Remaining
FM4 Battery Degradation POD1 Invalid OFF GOX Reboot Loop
FM5 Battery DegradationPOD1 Invalid
OCC Low SNROFF GOX Reboot Loop
FM6 Battery DegradationPOD1 InvalidOCC1 Invalid
OFF GOX Reboot Loop
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Outline
Introduction System and Mission Overview GPS Radio Occultation Current Status Data Analysis Discussion Conclusion Reference
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Data Analysis Discussion
Analysis Objects: Sun Beta Angle Flip-Flop Battery Aging Trends Reaction Wheels SNRs of GOX Payloads
Analysis Methods: Hilbert-Huang Transform Shot-Time Fourier Transform
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Beta Angle
Low Beta Angle(0 degree)
Eclipse Zone
Sun Beta AngleHigh Beta Angle
(90 degree)
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Sun Beta Angle
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Flip-Flop
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Battery Aging Trends
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Battery Aging Trends
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Reaction Wheels
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Reaction Wheels
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SNRs of GOX Payloads
2007 2008 2009 2010 20110
200
400
(a) FM2, Anttena 0
YearS
NR
1
2007 2008 2009 2010 20110
500(b) FM2, Anttena 1
Year
SN
R1
2007 2008 2009 2010 20110
200
400(c) FM2, Anttena 3
Year
SN
R1
2007 2008 2009 2010 20110
200
400(d) FM2, Anttena 3
Year
SN
R1
2007 2008 2009 2010 20110
500
(a) FM3, Anttena 0
Year
SN
R1
2007 2008 2009 2010 20110
500(b) FM3, Anttena 1
Year
SN
R1
2007 2008 2009 2010 20110
200
(c) FM3, Anttena 2
Year
SN
R1
2007 2008 2009 2010 20110
500
(d) FM3, Anttena 3
Year
SN
R1
2007 2008 2009 2010 20110
200
400
Year
SN
R1
2007 2008 2009 2010 20110
100
200
Year
SN
R2
Anttena 0: POD1Anttena 1: POD2Anttena 2: OCC1Anttena 3: OCC2
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Conclusion
The FORMOSAT-3/COSMIC mission initiates a new age for operational GPS-RO soundings for monitoring and forecasting of weather.
The advanced adaptive analysis methods (STFT and HHT) are useful to analyze the trending data.
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Reference
[1] C.-J. Fong, S.-K. Yang, C.-H. Chu, C.-Y. Huang, J.-J. Yeh, C.-T. Lin, T.-C. Kuo, T.-Y. Liu, N. Yen, S. S. Chen, Y.-H. Kuo, Y.-A. Liou, and S. Chi, “FORMOSAT-3/COSMIC constellation spacecraft system performance: After One Year in Orbit”, IEEE T. Geosci. Remote, 46(11), 3380–3394, doi:10.1109/TGRS.2008.2005203, 2008b.
[2] C.-J. Fong, D. Whiteley, E. Yang, K. Cook, V. Chu, B. Schreiner, D. Ector, P. Wilczynski, T.-Y. Liu, & N. L. Yen, “Space & Ground Segment Performance of the FORMOSAT-3 / COSMIC Mission: Four Years in Orbit,” Atmospheric Measurement Techniques Journal (AMTJ), Vol. 4, 2011, pp. 1115-1132. Doi:10.5194/amt-4-1115-2011.
[3] Chen-Joe Fong; Yen, N.L.; Chang, G.; Cook, K.L.B.; Wilczynski, P.; , "Future Low Earth observation Radio Occultation mission: From research to operations," Aerospace Conference, 2012 IEEE , vol., no., pp.1-10, 3-10 March 2012
[4] 方振洲、丁建均、王麗豐、顏隆政、楊善國、張明雄、李宗平、王逸民 , “適應性分析方法於福衛三號衛星資料之應用 ,” 中華民國航空太空學會學術研討會 , Dec. 2012
[5] National Space Organization: http://www.nspo.narl.org.tw/tw/ [6] Global Positioning System:
http://en.wikipedia.org/wiki/Global_Positioning_System