Eumetcast eumetsat s broadcast system for environmental data
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EUMETCast EUMETSAT’s Broadcast System for Environmental Data. Concept & Overview. Generic, multi-mission dissemination system based on the standard DVB multicast technology Use of commercial telecommunication satellites Allowing use of off-the shelf, commercial, inexpensive equipment

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EUMETCast EUMETSAT’s Broadcast System for Environmental Data

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Eumetcast eumetsat s broadcast system for environmental data

EUMETCastEUMETSAT’s Broadcast Systemfor Environmental Data


Concept overview

Concept & Overview

  • Generic, multi-mission dissemination system based on the standard DVB multicast technology

  • Use of commercial telecommunication satellites

  • Allowing use of off-the shelf, commercial, inexpensive equipment

  • DVB/MPEG-2 based transport for carrying IP datagrams

  • Use of a set of broadcast satellite forward channels (no return channel)

  • Components:

    • Data providers

    • Service management provider (EUMETSAT)

    • Uplink service provider

    • Turn around service provider(s)

    • Satellites

    • (Reference) Reception stations


Components figure

Components Figure


Components

Components

  • Data Providers

    • Provide, via FTP over a number of communication lines (Internet, VPN, leased lines, …), the files to be disseminated, currently:

      • EUMETSAT

      • DWD (Germany)

      • OSI SAF (Norway & France)

      • VITO (Belgium, Vegetation Products)

  • Service Management Provider (EUMETSAT)

    • Performs all service configuration (bandwidth, users, encryption parameters, dissemination parameters, …) to the DVB uplink provider via FTP over a secure communication line


Eumetcast eumetsat s broadcast system for environmental data

Data Providers & Service Management Provider

Data

DVB BROADCAST

Service Management

Other Sources

DWD

EUMETSAT

DVB UPLINK

USERS

SAFs


Components1

Components

  • Turn around Service Provider(s)

    • Receives the DVB signal provided by the uplink service provider

    • Retransmits the data (on DVB packet level) to another S/C

    • Receives retransmitted data by a local reference reception station for service monitoring and service level agreement tracking

    • One turn around service implemented for African Users (not covered by the uplink service)

    • Current contract with Telespazio

    • Turn around station in Fucino/Italy


Components2

Components

  • Satellites

    • Commercial digital TV geostationary satellites for data reception and transmission

    • Uplink service S/C:

      • Hotbird-6

      • Located at 13 degree East

      • Ku-Band transponder used

    • Turn around service S/C:

      • Atlantic Bird-3

      • Located at 5 degree West

      • C-Band transponder used


Eumetcast eumetsat s broadcast system for environmental data

EUMETCast Ku-Band Coverage


Eumetcast c band coverage

EUMETCast C-Band Coverage


Components3

Components

  • (Reference) Reception Stations

    • Same equipment for different purpose

      • Reference reception stations for monitoring of the health of the system and for service level agreement tracking

      • Reception stations for the end users

    • Consisting of antenna/feed/LNB, DVB receiver card, Workstation & S/W

    • Antenna:

      • Size (diameter) depending on EIRP figure at location (=> table)

    • LNB:

      • For Ku-band: standard digital TV LNB

      • For C-band: different brands, proposed by service provider and used at EUMETSAT: California Amplifier 140105-1


Components4

Components

  • DVB Receiver Cards used at EUMETSAT

    • TechniSat SkyStar2

    • BroadLogic [email protected] 2030

    • Pentamedia [email protected]

  • Workstations

    • Standard / state-of-the-art PC (with USB port)

  • Software

    • Operating Systems: Windows suite & LINUX

    • EUMETCast Client Software: tq®-TELLICAST

      • Supporting processing, monitoring & logging of incoming data

  • Configuration constraints:

    • Recommended/tested combinations:

      Ku/C-band <=> DVB receiver card <=> Operating System


Components5

EIRP to Dish Size Conversion Table (indicative)

EIRP, dBW

Dish, cm

51  

60  

50  

67  

49  

75  

48  

85  

47  

95  

45  

120  

42  

160  

40  

200  

39  

240  

37  

300  

Components


Eumetcast eumetsat s broadcast system for environmental data

Components: Parts and Costs of a Reception Station

DVB Standard Hardware

LNB Ku-/C-band & Satellite Dish

200/1000 EUR

DVB PCI Card

100 EUR

DVB Multicast Client software

60 EUR

EUMETCast key unit (EKU)

40 EUR

PC, Hard disk, Ethernet

800 EUR

1.200/2000 EUR


C band reception issues

C-band Reception Issues

  • 2.4 m antenna dish recommended for Africa & Europe (3.0 to 3.7 m for some African/Indian Ocean islands)

  • 1.8 m dish in many cases sufficient (depending also on the quality (noise temperature) of the LNB

  • C-band significantly less susceptible than Ku-band to rain attenuation, but suffering frequently from electromagnetic interference (mainly radar)

  • Implementation of bandpass filters has shown good results => elimination of (nearly) all interferences


Current services

Current Services

  • High Rate SEVIRI Image Data - data from Meteosat-8

  • Low Rate SEVIRI Image Data - data from Meteosat-8

  • Rapid Scanning Service (RSS) - data from Meteosat-6

  • High Resolution Image (HRI) - data from Meteosat-7

  • Indian Ocean Data Coverage (IODC) - data from Meteosat-5

  • Data Collection and Retransmission (DCP)

  • Meteorological Data Dissemination (MDD)

  • Meteorological Products (including Satellite Application Facility products)

  • EUMETSAT ATOVS Retransmission Service (EARS)

  • Foreign Satellite Data (FSD)

  • DWDSAT


Service monitoring

Service Monitoring

  • Each data provider is responsible for the monitoring of its own data

  • EUMETSAT monitors the end to end service for the data provided by EUMETSAT

  • Each service provider (uplink service and turnaround services) is responsible for monitoring its complete service (penalties in case of failing to accomplish the service level agreement)


Encryption

Encryption

  • Enables independent targeting of files towards a single user or group of users

  • Enables secure control of access at individual file & user level

  • Encryption in accordance with EUMETSAT’s data policy

  • Using the tq-tellicast server S/W

  • Based on the Blowfish algorithm (symmetric 128 bit data keys)

  • Performed in the EUMETCast uplink server

  • Data keys valid for just one transmission

  • Data keys encrypted with private key of target user

  • On the fly encryption, can be switched off on a per channel basis


Decryption

Decryption

  • Decryption by the tq-tellicast client S/W in combination with a decryption device (EUMETCast Key Unit: EKU) and the EKU S/W package

  • EKU is an USB device

  • EKU in conjunction with corresponding username and user_key/password enables decryption of licensed services

  • Only data described as “essential” are decrypted without EKU

  • EKUs are distributed by EUMETSAT to registered users


Eumetcast licensed essential services

EUMETCast Licensed & Essential Services

  • Licensed Services

    • Subject to a Licensing Procedure

    • Involving Secretariat and National Met Services

    • Comprising forms, tellicast S/W and EKUs

  • Essential Services

    • No licensing, but registration by the Secretariat

    • Provision of tellicast S/W & generic username/password

    • EKU not required


User registration

User Registration

  • Steps for Access to the EUMETCast Services:

    • Complete the EUMETCast Registration Form, indicating the requested services

    • If access to licensed service(s) requested, EUMETSAT’s User Service Helpdesk will forward your Registration Form to the relevant Licensing Agent (generally the National Met Service)

    • Once licensing procedure completed (and bill paid for EUMETCast Client S/W & EKU):

      • Access granted (by encryption configuration)

      • Reception of EUMETCast Client S/W

      • Reception of username and user_key/password

      • Reception of EKU (if required)


Eumetcast delivered services registration figures

EUMETCast Delivered Services (Registration Figures)


Eumetcast service availability

EUMETCast Service Availability

  • EURD figure (complete & timely Repeat Cycles): 95%

  • MOSS figure (complete & timely Repeat Cycles): 99%

  • Service Level Agreement (SLA) with both service providers (T-Systems and TELESPAZIO): 99.50%

  • Ku-band Performance (following graph):

    • T-Systems HRIT segment figures only, comprising performance of uplink system, Hotbird-6 and reference reception station

  • C-band Performance (following graph):

    • TELESPAZIO HRIT segments figures only, comprising perf. of turn-around system, Atlantic Bird-3 and ref. reception station

  • Total Performance (following graph):

    • Percentage of complete and timely received Repeat Cycles, covering all non-availabilities (Ground Segment & Service Prov.)


Eumetcast service availability1

EUMETCast Service Availability


Eumetcast service extensions envisaged

EUMETCast Service Extensions Envisaged

  • Evolution of Meteosat-8 meteorological products

    • New products based on prototyping by MET (Clear sky Reflectance Map product (CRM) being the next one)

    • Updates of existing products based on operational experience

  • VEGETATION derived products for Africa

    • VEGETATION products from the VEGETATION instrument on SPOT

    • Operational trial phase has started, dissemination of 10 day Vegetation Index product (S10NDVI) to Users in Africa

  • EUMETCast/EPS Convergence

    • EPS global products to be disseminated using EUMETCast;

    • Initially, this focuses on level 1 and 2 global products generated in the CGS at EUM;

    • Global level 1 and 2 PDUs per instrument will be available as a EUMETCast service;

    • Will be extended to SAF products as appropriate.


Eumetcast service extensions envisaged1

EUMETCast Service Extensions Envisaged

  • EUMETCast coverage extension to South America

    • implementation of a turn-around system – similar to that provided by TELESPAZIO for Africa => under discussion with member states

  • Basic meteorological Data from WMO regional Association VI

    • RA VI is Europe and Middle East

    • Use of EUMETCast for basic provision of observations and forecasts

    • Working Group under RA VI is establishing user requirements

    • Formal proposal to EUMETSAT delegate bodies presented

  • Extension of DWDSAT service planned by DWD (Spring 2005)


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