CBERS Program: An Overview

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CBERS Program An Overview

• Earth Observation Directorate
• September 2004

Prepared by José Carlos Epiphanio (CBERS
Application Program Manager) and Gilberto Câmara
(Director for Earth Observation)
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CBERS China-Brazil Earth Resources Satellite

• Brief History
• Initial agreement signed in July 6th, 1988,
  covering CBERS-1 and 2.
• In 2002, both governments decided to expand the
  initial agreement by including CBERS-3 and 4.
• Program objectives
• Build a family of remote sensing satellites to
  support the needs of users in earth resources
  applications
• Improve the industrial capabilities of space
  technology in Brazil and China

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CBERS Program Timeline
Launch Date Operation 2004 2005 2006 2007 2008 2009 2010 2011
CBERS-1 1999 4 years
CBERS-2 2003 4 years
CBERS-2B 2006 4 years
CBERS-3 2008 5 years
CBERS-4 2011 5 years
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CBERS Satellite Platform
Total Weight 1500 Kg Dimension 1,8 x 2,0 x
2,2 m Power 1100W AOCS 3 axis
stabilization Compatible with Long March-4
launch vehicle. Payload bit rate 53 Mb/sec x
2 (CBERS-1,2) 150 Mb/sec x 2 (CBERS-3,4)
Design already qualified in CBERS-1 and 2, will
be improved for CBERS-2B, 3 and 4
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CBERS Orbit

• Sun synchronous
• Height 778 km
• Inclination 98,48 degrees
• Period 100,26 min
• Equator crossing time 1030 AM
• Revisit 26 days
• Distance between adjacent tracks 107 km

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CBERS-2
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Work Share (70 China, 30 Brazil)

• Service Module
• Structure Brasil
• Thermal Control China
• Attitude and Orbit Control China
• Power supply Brasil
• On-board computer China
• Telemetry Brasil
• Payload Module
• CCD China
• IRMSS China
• WFI Brasil
• Data Transmission China
• Data collection Brasil

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CBERS-2 being put into Long March-4B
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Long March-4B

• Height 44 meters
• 3 stages, liquid fuel
• Capacity of launching 2800 kg in sun-synchronous
  orbit (900km)
• Total weight 250 tons
• (232 tons of fuel)
• Launched 6 times with success since May 1999

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CBERS-2
CBERS-2 Launch (21 October 2003)
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CBERS-2 Orbits
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CBERS 1,2, 2B Sensor Configuration
WFI 260 m (890 km)
MSS 80 m (120 km)
CCD 20 m (120 km)
2.3
0.4
2.5
0.7
1.1
0.9
0.5
1.5
1.7
mm
Built by China
Built by Brazil
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CBERS-1,2, 2B Sensor Configuration
Sensor Bands (?m) Swath (km) Resolution (m)
CCD 0.45-0.52 120 20
0.520.59 120 20
0.630.69 120 20
0.770.89 120 20
0.51-0.73 120 20
IRMSS 0.76-1.10 120 80
1.551.75 120 80
2.082.35 120 80
10.412.5 120 160
WFI 0.630.69 890 260
0.770.89 890 260
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Image CBERS-2 WFI
WFI sensor
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WFI sensor
CBERS2-WFI 157/124, 10/03/2004, São Paulo
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CBERS-2 IRMSS (Rio Preto, Brazil)
10/03/2004
CB2-IRM-157/123, 18/01/2004
CB2-CCD
CB2-CCD
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IRMSS sensor
CB2-IRM-157/124, 24/3/2004, Catanduva (Brazil)
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CBERS2 - IRMSS x CCD (Maringá, Brazil)
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CBERS-2 CCD, Minas Gerais, Brazil
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CB2 CCD 156/121- 4/11/2003 Brazil
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CBERS-2 CCD Sobradinho Dam, Brazil Dez 2003
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CBERS-2 CCD, Parnaíba River Delta, Nov 2003
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CBERS-2 CCD Manaus, Brazil, Dec 2003
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CBERS-2 CCD, Pradópolis, Brazil, Nov 2003
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CBERS 3 4 Sensor Configuration
WFI 73 m (860 km)
MSS 40 m (120 km)
CCD 20 m (120 km)
MUX 10 m (60 km)
PAN 5 m (60 km)
2.1
0.4
2.3
0.7
1.1
0.9
0.5
1.5
1.7
Built by China
Built by Brazil
mm
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Optical Sensors (Medium Resolution, Global
Coverage)
Launch Date Res (m) 2004 2005 2006 2007 2008 2009 2010
LANDSAT5 1984 30
LANDSAT8 2008? 25
HRV/SPOT4 1998 10/20
HRV/SPOT5 2002 20
CCD CBERS-2 2003 20
CCD CBERS-2B 2006 20
CCD CBERS-3 2007 20
LISS-3 IRS-P6 2003 23
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Optical Sensors (Large Swath, High Temporal
Resolution)
Swath (km) Res (m) 2004 2005 2006 2007 2008 2009 2010
MODIS (TERRA AQUA) 2500 250 2001
VEGETATION (SPOT-4/5) 2500 1000 2003
MERIS (ENVISAT) 1100 300 2002
WFI (CBERS2 CBERS2B) 890 260 2003
AWFIS (IRS) 700 65 2003
AWFI (CBERS-3) 750 70 2008
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CBERS 3/4 x LANDSAT-8
TM 30 m (180 km)
PAN 15 m (180 km)
WFI 73 m (860 km)
MSS 40 m (120 km)
CCD 20 m (120 km)
MUX 10 m (60 km)
PAN 5 m (60 km)
2.1
0.4
2.3
0.7
1.1
0.9
0.5
1.5
1.7
mm
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CBERS 3/4 x IRS-P6 e IRS-P5
AWFIS 70 m (700 km)
LISS 23 m (140 km)
MSS 5.8 m (24 km)
PAN 2.5 m (30 km - stereo)
WFI 73 m (860 km)
MSS 40 m (120 km)
CCD 20 m (120 km)
MUX 10 m (60 km)
PAN 5 m (60 km)
2.1
0.4
2.3
0.7
1.1
0.9
0.5
1.5
1.7
mm
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CBERS Ground Station
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CBERS Ground Station in Brazil

• Developed by Brazilian company and INPE
• Major cost saving
• User-centered design
• User requests products in a web interface
• Products are generated automatically
• User can download products via FTP
• Efficiency and scalability
• Based on low-cost Linux PCs
• Totally automated, no operator intervention

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Ground Station Design Principles

• Low-cost hardware
• Standard PCs
• Open software and standards
• Linux, GCC, Apache, PHP, MySQL, HDF, GeoTIFF, XML
• Scalability and automation
• Modules, distributed processing
• Use of Internet technology
• Scripting languages, Web browser

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CBERS Image Distribution in Brazil (May to August
2004)
Total number of full CCD scenes distributed (145 Gb/scene) 22,460
Number of users 4960
Number of scenes produced per week 2115
Average time to process a user request 12 min
Production environment 8 PCs/Linux
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FTP area for User
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Data Policy for CBERS

• Three different situation
• Case 1 Distribution of data received at China
  and Brazil
• Case 2 Use of on-board data recorder
• Case 3 Data reception and distribution by other
  ground stations

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Case 1 Imagens received by Brazil/China ground
stations

• These ground stations have unlimited access to
  all data collected within their footprint.
• The policy for distribution of data collected by
  those ground stations will be decided by each
  operator.
• CRESDA can distribute all data collected by the
  Urumqi, Guangzhou and Beijing ground stations
  according to its best interests
• INPE can distribute all data collected by the
  Cuiaba ground station according to its best
  interests

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CASE 2 - Images obtained by OBDR

• INPE and CRESDA have exclusive rights for use of
  on-board data recorder for CBERS-2 and CBERS-2B

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CASE 3 Distribution of Images Outside
Brazil/China

• CRESDA and INPE will license a third party
  company that will sell access time to CBERS for
  international ground stations
• CBERS is marketed as a LANDSAT-class satelite
• Access fee covers full downlink to data on ground
  station footprint
• Software and hardware for CBERS ground stations
  is provided by a company licensed by INPE and
  CRESDA