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Topics 1.Satellite data acquisition, processing and Serving flow in NSMC

Meteorologic al Satellite Data Serving capability in China SunAnLai NSMC/CMA Sunal@nsmc.cma.gov.cn Jun 1, 2005. Topics 1.Satellite data acquisition, processing and Serving flow in NSMC 2. Introduction of DVB-S satellite data broadcasting system

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Topics 1.Satellite data acquisition, processing and Serving flow in NSMC

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  1. Meteorological Satellite Data Serving capability in ChinaSunAnLai NSMC/CMASunal@nsmc.cma.gov.cnJun 1, 2005

  2. Topics 1.Satellite data acquisition, processing and Serving flow in NSMC 2. Introduction of DVB-S satellite data broadcasting system 3. Introduction of satellite data serving through website 4. Future plan

  3. Section OneMain data acquisition, processing and serving flow in NSMC

  4. Meteorological Satellite Ground Stations For Data Acquisition: • There is 4 ground stations belongs to NSMC(National Satellite Meteorological Center), they located in Beijing, Guangzhou, Urumchi, Lhasa. Beijing Guangzhou

  5. Ground stations for data acquisition BeiJing Urumchi Lhasa GuangZhou

  6. Data coverage:

  7. Meteorological Satellite Data Archiving System in NSMC • Two IBM P690 Servers • SAN storage system with 64TB disk array • a IBM tape library(Capacity of 1500TB) It can meet archiving demands of the NSMC’ s meteorological satellites datain future 8 years.

  8. Data Archiving policy To all current and future satellites • Data store on-line for three months • Data store near-line for three years • Migrate out of tape library after three years • Dual copies for data safety.

  9. 1 Serving Mode of Meteorological Satellite Data • Use DVB-S system to broadcast Satellite Data. • Provide network service (retrieval and download) through internet.

  10. 2 Meteorological Satellite Data Provided to users • All Level-1B Data. • Higher Level Products.

  11. Section TwoIntroduction of DVB-S satellite data broadcasting system

  12. 1 What’s DVB-S?DVB-S is a digital video broadcast by communication satellite system used to distribute data. Broadcast China Star-1 data NSMC DVB UPLINK USERS

  13. 2 Why we use DVB-S in China? • Data network in China is still in developing. The bandwidth of network is not wide enough for data distribution. • Users have to install expensive receiving system to receive meteorological satellite data directly.

  14. 3 Current Status of DVB-S System The initial purpose of DVB-S is to provide EOS-MODIS data sharing for national users. Now it become a environmental satellite data sharing platform. Since this system get into operation in the middle of 2004, over 70 users installed DVB-S user station .

  15. Steps • Jun 2004: start of operations with 6Mb to distribute MODIS data through China Star-1 satellite .China Star-1 is positioned above 87.5E. • Sep 2004: added FY-1D CHRPT, NOAA HRPT data. • May 2005: added FY-2C S_VISSR data

  16. EIRP Coverage:It cover china and around.

  17. Advantage • Flexible: configurable bandwidth, multicast. Supports more 8192 users. • Fast distribution capability: 6Mb bandwidth. Could be upgraded easy if necessary. • Priority: Data to be uplinked could be arranged priority.

  18. Advantage • Large coverage: China and surrounding china, Totally more 19 Asia countries are under it’s footprint. • Low cost: Client device is very cheap.

  19. DVB-S Uplink Station

  20. Parameters for Uplink • Site：Beijing(116.91°,39.90°) • Uplink Antenna: 4.5M • Amplify：16W@Max • Carrier: Single • Band：6MHz • Uplink Central Frequency :14175MHZ • Rate: 5920KHz(Char Rate ,4340KHz) • Code:QPSK，3/4FEC，188/204RS • Availability: 99.97％

  21. User stationDVB Satellite Reception / Receiver Unit DVB Standard Hardware LNB Ku-band Satellite Dish DVB PCI Card DVB Multicast Client software PC, Hard disk, Ethernet

  22. Section ThreeIntroduction of satellite data serving by Website

  23. Basic Function • Open a legal account. • Retrieval data by key word. • Quick look compressed image • Download technique documents • Submit the order of interesting data • Download the ordered data Now Chinese version Website has get into operation. English version is under designing and will work soon.

  24. Data Provided In Website

  25. Data Provided In Website

  26. Section FourFuture plan

  27. 1 To improve the capability of DVB-S 1: To distribute FY2C numerical products in 2005.2: To add data ordering function through Website so historic data can be broadcasted by DVB-S. BOD: Broadcast On Demand.

  28. 2 To provide historical satellite data servicemore than 20 years satellite data has been archived in NSMC

  29. Historical Data Reorganize 1: Rescue the archived data.2: Reprocess such as Q.C, location and calibration3: Make standard 1B datasets and climate datasets4: Store data into IBM tape library5: Provide historical data service in Website

  30. The EndThank you

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