1. H. Y. Paik Korea Aerospace Research Institute 1998. 7. 25.
KOMPSAT- I and OSMI
H. Y. Paik
Korea Aerospace Research Institute
KOMPSAT OSMI

2. CONTENTS 1. KOMPSAT OVERVIEW 2. Electro-Optical Camera(EOC) OVERVIEW
3. Payload Data Transmission Subsystem(PDTS)
4. Ocean Scanning Multispectral Imager(OSMI)
5. KOMPSAT II PLAN
6. SUMMARY
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KOMPSAT OSMI

3. KOMPSAT OVERVIEW Mission : Earth Remote Sensing(EOC, OSMI)
and Space Experiment(SPS)
Mission Orbit
- Circular, Sun-synchronous
- 685km altitude, deg. Inclination
- 10:50AM Equatorial Crossing(Ascending)
min orbit period
- 2 day (45 deg. Roll) / 3 day (30 deg. Roll) revisit
Launch date : August, 1999 ( 3 year life time)
Spacecraft Mass : About 500 kg(including 73 kg propellant)
Joint Development with TRW
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4. KOMPSAT OVERVIEW(OPERATION)
Electro-Optical Camera(EOC)
Pushbroom Scanned
Off-pointed for Cartography
15km swath 6.6m GSD(nadir)
2 minute contiguous duty cycle
Payload Data Transmission
Subsystem(PDTS)
X-band system for image data
Solid State Recorder(2.5Gbit)
10% duty cycle
Payloads
Mission and Control Center
RF Communications (S-Band)
Satellite Operations
Mission Planning
Spacecraft Simulator/Training
Ground Station
Ocean Scanning Multi-spectral
Imager(OSMI)
Cross Track Scanned
800km swath, 1km GSD
20% duty cycle
Science Physics Sensor(SPS)
Ionosphere Measurement Sensor
High Energy Particle Detector
100% duty cycle
Image Processing Center
RF Communications (X-Band)
Image Processing
Product Generation
Data Storage and Distribution
External Interface
Users
Additional Image Acquisition
or LEOP stations
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5. KOMPSAT OVERVIEW(OPERATION)
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6. KOMPSAT OVERVIEW(GROUND STATION)
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7. KOMPSAT OVERVIEW(SPACECRAFT)
Space Physics Sensor
L/V Adapter
Solar Array
BUS
Electro Optical Camera
Ocean Scanning Multi-spectral Imager
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8. KOMPSAT OVERVIEW(PAYLOAD)
KOMPSAT-I Payload Configuration
EOC
LRC
Weight Power
EOC Kg W
LRC Kg W
SPS Kg W
PDTS Kg W
Total Kg W
SPS
PDTS
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9. TOP LEVEL MISSION OVERVIEW
Korea Cartography Mission
- Provide images for cartography which will allow the production of a map of Korea to a 1:25000 scale standard
Ocean Color Monitoring Mission
- Image oceans to support biological oceanography
- 6 spectral bands, large scale multispectral images
Scientific Payloads Accommodation Mission
- Accommodate customer-furnished scientific payloads
• Ionosphere Measurement Sensor (IMS)
- Globalized measurement of ionized layer in KOMPSAT orbit
• High Energy Particle Detector (HEPD)
- Globalized measurement of high energy particles in KOMPSAT orbit
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KOMPSAT OSMI

10. EOC OVERVIEW
The KOMPSAT EOC mission objective is to provide images for the production of scale maps including digital elevation models.
The EOC Design Specification
Panchromatic spectral band: nm
Ground Sample Distance(GSD); 6.6m in nadir view
Swath width: >15Km in nadir view
MTF: >10% at Nyquist frequency
SNR: >50
Data Rate: <25Mbps
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11. EOC OPERATION CONCEPT Cartography Data Collection OCARE-98/NTU
Operational Control
Mode Control
2 minute(contiguous) duty cycle per orbit
Programmable gain control
Spacecraft roll control for swath pre-position
Real time data downlink via X-band in view of
KGS
Capability to store EOC data in PDTS SSR within
storage capacity and duty cycle constraints
On-board Calibration: dark & solar calibration
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KOMPSAT OSMI

12. PDTS OVERVIEW
The KOMPSAT PDTS mission objective is to provide X-band downlink to transmit EOC/OSMI image data and On-Board-Computer(OBC) data to Korea Ground Station(KGS).
PDTS Design and Function
Formatter/Multiplexer Unit(FMU)
to format and encode image data and telemetry data in CCSDS grade 2
(Input Data Rate; EOC: 25Mbps, OSMI: 1Mbps, OBC: 1.5Mbps)
to store image data in Solid State Recorder(SSR) with the storage capacity of for later playback downlink
Transmitter
QPSK modulation
RF Assembly
X-band Omni Antenna
Data Transmmision Rate : 45Mbps
Data Reception Contact Area Radius from KGS : 1500Km
Link margin > 3dB with BER of 10-6
Duty Cycle per Orbit : 10%
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13. OSMI MISSION
The KOMPSAT OSMI Mission objective is to provide ocean color
measurements for biological oceanography.
The OSMI primary spectral bands selected to meet the mission goal are:
Band # Bandwidth Sensing Objective
B1: (443 nm) 20 nm Concentration of chlorophyll
B2: (490 nm) 20 nm Concentration of pigment
B3: (510 nm) 20 nm Turbidity of chlorophyll
B4: (555 nm) 20 nm Turbidity
B5: (670 nm) 20 nm Calibration of atmospheric effect
B6: (865 nm) 40 nm Calibration of atmospheric effect
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14. OSMI OPERATION CONCEPT
Ocean Color Monitoring Data Collection
Operational Control
Mode Control (20% duty cycle)
Selectable bands(6 bands within nm)
Programmable gain control
Collection during vertical viewing at specified performance
Real time data downlink via X-band in view of ground station
Stored data via PDTS SSR out of view within storage and duty cycle constraints
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KOMPSAT OSMI

15. OSMI OPERATION CONCEPT
OSMI Operation Modes
once per orbit,
at the earth north pole
Solar
Calibration
Safe/Hold
Standby
Imaging
20% duty per orbit,
image data collection
SOH data downlink
commands uplink
Dark
Calibration
Reset
before and after imaging mode
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KOMPSAT OSMI

16. OSMI PERFORMANCE
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17. OSMI DESIGN OSMI Optical Layout VIEW FROM +X ( COVERS REMOVED)
APERTURE CELL
(WITH CORRECTOR
LENS)
FIRST FOLD MIRROR
CELL
FORE-OPTICS
CELL
WINDOW
CELL
DARK CALIBRATION
CAVITY
SLIT CELL
SCAN
FIELD OF REGARD
RANGE LIMIT
COLLIMATING
CELL
GRATING
CELL
SCAN MIRROR
RE-IMAGING
CELL
SOLAR CALIBRATION
CAVITY
SECOND FOLD MIRROR
CELL
VIEW FROM +X ( COVERS REMOVED)
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18. OSMI PHOTON COLLECTION
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19. OSMI DESIGN OSMI Electronics Block Diagram OCARE-98/NTU LSA LEA
Video
Focal Plane Module
o CCD
o Electronics
Clock
Video Electronics
Power
(VE)
FPA
Gain
Data
Offset
Timing
Spacecraft
Data
Data Buffer
o Data
Compression
Spectral
PDTS
Data
1553B
Command,
Temp.
Processor
LSA
SOH Telemetry
Sensors
o Temp. Sensor
Htr
Time Mark,
o Heater
Power
Safe Hold
Scan Driver
Motor
Scan Drive
Electronics
Assembly
Drive
o Motor
OBC
o Pos. Sensor
Position
ON/OFF
Power Converters
Command
Survival Heater
ON/OFF
& Thermostat
On/Off Relay
Status
28VDC
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20. BAND SELECTION CHARACTERISTICS
768
CCD Package Top view
384
Fanout
Substrate
96km
Super
Pixel
1km
768
Storage Register
Storage Register 96
Spatial
Temperature
Sensor
CCD Active
Image Area
1km
192
900nm
400nm
Spectral
2.6nm
Minimum Selectable Band = 2.6 nm X 2 = 5.2 nm
Maximum Selectable Band = 2.6 X 64 =140 nm . .
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21. OSMI BAND SELECTION CAPABILITY
OSMI has on-orbit spectral band selectibility via Ground Command after launch.
Any 6 spectral bands can be selected in the spectral range from 400 nm to 900 nm which is divided into 192 spectral pixels.
There are always 6 bands without overlap among the bands
Band Center: 6 positions with 2.6nm accuracy
Band Width: minimum 5.2 nm, maximum nm
Command is valid in the standby mode only.
The above on-orbit band selectibilty provides
- great flexibility in Ocean Color Monitoring
- research opportunities to support the next generation
sensor design
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22. OSMI MISSION PARAMETER
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23. OSMI MEASURED PERFORMANCE
The instrument performance is measured on-ground for 8 basic spectral bands within 400 nm ∼ 900 nm including the primary bands.
(1)Spectral Band Characteristics
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24. OSMI MEASURED PERFORMANCE(Con’t)
(2) OSMI radiometric characteristics
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25. OSMI MEASURED PERFORMANCE(Con’t)
(3) MTF
The satellite-level MTF is predicted as shown in the Figure 3.3 based on the measured values of instrument level MTF, space environment (temperature change and vacuum) effect analysis and satellite motion (jitter & smear) effect analysis.
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26. KOMPSAT - II PLAN Scheduled to be launched in 2002 - 2003 period
KARI will be responsible for the development.
Heritage : KOMPSAT - I
Estimated weight & power: 800kg / 800watt
Main Payload : Multi-Spectral Camera
(Pan: 1m GSD, 4 band multi-color: 4m GSD)
Secondary Payload : under- study
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27. SUMMARY KOMPSAT- I is scheduled to be launched in August 1999
(KOMPSAT II IN Period)
OSMI will perform worldwide ocean color monitoring.
OSMI major specification
Orbit : 685Km altitude, 10:50AM ascending, Sun Synchronous
GSD : 1Km, Swath Width: 800Km
Spectral Band: 6 bands
Duty Cycle: 20%
On-board Image Data Storage: 2.5Gbits at the end of life time
OSMI has On-orbit spectral band selection capability.
Selection of 6 bands from 400 nm to 900 nm
Great flexibility for ocean color monitoring and its applications
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28. KOREA MULTI-PURPOSE SATELLITE
KOREA AEROSPACE RESEARCH INSTITUTE
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29. KOREA MULTI-PURPOSE SATELLITE
S/C BUS
Solar Array
Space Physics Sensor
Electro Optical Camera
L/V Adapter
S-band Antenna
Ocean Scanning Multi-spectral Imager
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30. KOMPSAT APPLICATIONS
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31. KOMPSAT APPLICATIONS
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32. KOMPSAT FM UNDER INTEGRATION
Payload Module
Proto-Flight Model
in Final Assembly
Equipment Module
Propulsion Module
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33. Satellite Assembly, Integration & Test Center
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34. KOMPSAT AI&T FACILITIES
Orbit Environment Test
- Thermal-vacuum Chamber
- Thermal-shock Chamber
- Bake-out Chamber
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35. KOMPSAT AI&T FACILITIES
Integration & Assembly
- Angular accuracy : 1/360
- Position Accuracy : 50
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36. KOMPSAT AI&T FACILITIES (continued)
Launch Environment Test
- Vibration Test System
- Mass Property System
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37. KOMPSAT AI&T FACILITIES (continued)
EMI/EMC Test
- Anechoic Chamber
- 13(L)x12(W)x7(H)m
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38. Payload Assembly and Test Lab.
Optical Instrument Assembly and Test Lab.
- Large Aperture / High Precision Optics
- Surface Quality Measurement
- Alignment
- Performance Test (Parts / E-O System)
- Vibration Control / Clean Room Facility
Electronics Assembly and Test Lab.
- General P/L Electronics Test-bed
- Focal Plane Assembly Test & Analysis
Sensor Characteristics
FPE and Analog Signal Processor
- Payload Data Transmitter Test & Analysis
Flight Software Test Lab.
- Flight Software Design and Test for the On-board Computer and Payload Instruments
- Development of Software Test-bed
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39. KOMPSAT GROUND STATION
Mission Control & Data Receiving / Processing Station
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