1 meteorological satellite data serving capability in china meteorological satellite data serving...
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MeteorologicMeteorologicalal Satellite Satellite DataData
Serving Serving capabilitycapability in China in China
SunAnLai NSMC/CMA
Sunal@nsmc.cma.gov.cnJun 1, 2005
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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
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Section One
Main data acquisition, processing and serving flow in NSMC
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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
Station Longitude/Latitude Satellites Acquisition
Beijing 116.28°E,40.05°N FY-2C, FY-1D, NOAA16,17, EOS Terra/Aqua , GOES-
9,Meteosat-5
Guangzhou
113.34°E,23.16°N FY-1D, NOAA16,17, EOS Terra/Aqua
Urumchi 87.57°E,43.86°N FY-1D, NOAA16,17,
EOS Terra/Aqua
Lhasa 91.01°E, 29.40°N EOS Terra/Aqua
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Ground stations for data acquisition
BeiJing
GuangZhou
Urumchi
Lhasa
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Data coverage:
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SAN
Disk ArrayTAPE Library
Internet
FireWall
FTP Server
ResourceServer
UrumchiBeiJing GuangZhou
WEB Server
DPC Server DATABASE Server
Management Server
BroadcastingServer
4. 5M
Chi na Star-1
DVB-SUser Stati on
DVB-SUser Stati on
DVB-SUser Stati on
End User
DVB-S System
Data Acquisition System(Include FY-1、FY-2、NOAA、
EOS、GOES-9、MeteoSat-5) Network Serving System
NSMC
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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 data in future 8 years.
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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.
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1 Serving Mode of Meteorological Satellite Data
Use DVB-S system to broadcast Satellite Data.
Provide network service (retrieval and download) through internet.
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2 Meteorological Satellite Data Provided to users
All Level-1B Data. Higher Level Products.
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Section Two
Introduction of DVB-S satellite data broadcasting system
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1 What’s DVB-S?
DVB-S is a digital video broadcast by communication satellite system used to distribute data.
USERSDVB UPLINKNSMC
BroadcastChina Star-1
data
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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.
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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 .
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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
17EIRP Coverage:It cover china and around.
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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.
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Advantage
Large coverage: China and surrounding china, Totally more 19 Asia countries are under it’s footprint.
Low cost: Client device is very cheap.
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DVB-S Uplink Station DVB-S Uplink Station
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Parameters for Uplink
Site: Beijing(116.91°,39.90°)Uplink Antenna: 4.5MAmplify: 16W@MaxCarrier: SingleBand: 6MHzUplink Central Frequency :14175MHZRate: 5920KHz(Char Rate ,4340KHz)Code:QPSK, 3/4FEC, 188/204RSAvailability: 99.97%
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User station DVB Satellite Reception / Receiver Unit
DVB Standard Hardware
LNB Ku-band Satellite Dish
DVB PCI Card
DVB Multicast Client software
PC, Hard disk, Ethernet
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Location EIRP(dBW)
Dish Eb/N0(difference from Beijing
Beijing 49 1.8M 0dB
Guangzhou 52 1.8M 3dB
Harbin 46 1.8M -3dB
Urumchi 46 1.8M -3dB
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Section Three
Introduction of satellite data serving by Website
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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 oper
ation. English version is under designing and will work soon.
Basic Function
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Data Provided In Website
Satellite Data Type
FY-2 Full Disc Image , Segment Cloud Image, Atmospheric Motion Vectors , Precipitation
Estimation , Precipitation Index , Temperature Blackbody Equivalent , Outgoing Long wave Radiation , Fog , Sea Surface Temperature ,
Sea Ice , Surface Solar Irradiance
FY-1 Level-1B Data, Sea Surface Temperature , Outgoing Long wave Radiation , Vegetation
Index , Cloud Analysis , Snow Cover
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Data Provided In Website
Satellite Data Type
NOAA Leval-1B Data, Sea Surface Temperature , Outgoing Long wave Radiation ,
Vegetation Index , Cloud Analysis , Snow Cover
EOS Terra/Aqua
Level-1B Data
GOES-9 Segment Cloud Image
MeteosSat-5 Segment Cloud Image
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Section Four
Future plan
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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.
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2 To provide historical satellite data servicemore than 20 years satellite data has been archived in NSMC
Satellite Data Type Size/File Time ElapsedFY-1A/1B CHRPT 100MB 88.09-91.12
GDPT 200MB 88.09-91.12
FY-1C/1D CHRPT 200MB 99.05-now
GDPT 300MB 99.05-now
NOAA(7-17) HRPT 120MB 84.05-now
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Satellite Data Type Size/File Time ElapsedGMS-4/5 S-VISSR 100MB 89.01-2003.04
FY-2A/B S-VISSR 100MB 97.09-now
Meteosat-5 HRI 40MB 99.06-now
EOS Terra/Aqua MODIS 3GB 00.12-now
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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
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The End
Thank you
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