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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