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Lecture Note No. 4 TRAINING SEMINAR ON INFORMATION AND COMMUNICATION TECHNOLOGY FOR THE GTS

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Lecture Note No. 4 TRAINING SEMINAR ON INFORMATION AND COMMUNICATION TECHNOLOGY FOR THE GTS ( Cost effective satellite-based data broadcast system for replacement of the present HF Meteorological data /information broadcast))

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Lecture Note No. 4

TRAINING SEMINAR ON INFORMATION AND COMMUNICATION TECHNOLOGY FOR THE GTS

(Cost effective satellite-based data broadcast system for replacement of the present HF Meteorological data /information broadcast))

T.K.RAY

RTH NEW DELHI, INDIA

E mail :[email protected]

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Lecture Note 4

Cost effective Satellite-based Data broadcast systems for replacement of the present HF meteorological Broadcast

T.K.Ray/RTH,New Delhi

RTH, New Delhi have been broadcasting meteorological data/information through HF transmitters since 1963. The cost of each transmitter was about US $

2,00,000/- and every 5-7 years these transmitters (at least three) needed to be replaced. Besides this an amount of US $ 60,000/- spent every towards operation and maintenance of these transmitters. The terminal equipment at each of the 28 IMD field stations used to cost about US$21,000/- per station and this equipment also needed replacement every 5-7 years time.

Even after bearing such an astronomical expenditure it was not possible maintain the HF transmission due to obsolescence of the technology and non-availability of the transmitter spares.Recently, affordable satellite based broadcast technology has become commercially available in India. Small hand-held receiving equipment can be placed on the terrace, on the ground, in a ship or even

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on the roof of the moving vehicle. Experiments conducted over land and on ships prove that the technology can be effectively utilized for providing audio warnings, facsimile broadcast and digital data to the receiving equipment located on land/ on water bodies.

  • The other details of the system is given below:
  • *Two satellites viz. Afristar and Asiastar are already operating while the world satellite Ameristar is being launched.The footprint of the satellites is given below.
  • Each satellite has three beams
  • Each beam covers 14 million SQMs.
  • Each beam can carry 3072 KBPS of data
  • The ground receiving equipment consists of a small notebook size near omni-directional antenna, to be located in the open, a small radio receiver with a DDA (Digital Data Adopter) to be located in the operating room.
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Minimum computer configuration

  • Pantium-I Class computer, 150 MHz CPU speed, 64 MB RAM, 450 MB of Hard Disk Space, Multimedia Kit with Speakers, CD ROM, Windows X
  • World Space Receiver + DDA (Digital Data Adoper)/ PC Card
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The Benefits

  • Digital data broadcast from satellite directly to the PC via a WorldSpace Receiver, can stream continuously or in prepackaged form
  • Unaffected by terrestrial disturbance or natural disasters like cyclones or thunderstorms
  • Low cost interface for data reception at user end
  • No need for telephone line VSAT
  • Through low cost PC Receiver Cards
  • Information & Entertainment from a 128 Kbps multimedia along with around 40 audio channels across the globe,in near CD quality.
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The Technology—Delivery System

  • Pushing the Content
  • Pulls formatted multimedia content from content providers and routes this content to a centralized server.
  • The content is distributed to each ground station hubs for uplinking
  • The Geostationary satellites pushes the content to the subscribers PC through portable Receivers.
  • Data Connection to PC
  • End users access the service via the data port on the Receiver
  • The Special PC Adapter which is attached to the Receiver filters the incoming content and transfers authorized data to the attached PC.
  • Alternatively, the PC Receiver card will receive both audio as well as multimedia directly to the user’s PC
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Partners in Technology

  • Hitachi, JVC, Panasonic, Sanyo, Joyear, AMI for digital receivers
  • Alcatel for payload and satellite delivery
  • Matra Marconi space for satellite bus
  • Indian Space Research Organization/ DOS for satellite telemetry, telecommand and communication support
  • Arianespace for launch support
  • Rode and Schwartz for receiver test equipment
  • SGS Thomson for digital receiver customized chips
  • FHI for digital receiver technology
  • XM radio - mobile radio in US and Europe
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Multimedia Service capabilities

  • One 128 Kbps channel can deliver 1.3 Gigabytes of data directly to multiple remote clients over 24 Hour period – approximately 50 MB of data per hour.
  • Content is directly stored in the hard drive and viewed at user’s convenience
  • Discrete files can be anything from simple data files to MP3 files and software
  • Each PC Rx Card and DDA is provided with a unique license file to ensure that only authorized people receive the data, thus ensuring that the information disseminated remains secure.
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Service Operations: an overview

WS Satellite

  • Each Satellite has 3 Beams
  • Each Beam can have
    • 192 Channels of mono Radio OR
    • 96 Channels of Stereo Radio OR
    • 48 Channels of Stereo Music OR
    • 32 Channels of near CD Qty OR
    • 24 Channels of CD Quality OR
    • A Combination of channels with
    • different qualities

Music System

---------------

Ground Broadcast Stations

WS Receiver

---------

PC

Multimedia

feed

---------------

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The System

Up-link Stations

- MPEG 2.5 Layer 3

- PRC

- 1/2 FEC, RS

- FDMA/TDM

- ON BOARD

PROCESSING

- Audio

- Multimedia

Content

Satellite

Satellite Control

Network

Radio Receivers

Network & Signal

Architecture

Personal Computers

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System Architecture

Data Files from

FTP Server

Dial-Up

Connection

Data Input Interface

Receiver

Web

Interface

Scheduler/

Formatter

Digital Data

Adapter

Data

Storage

PC

FLS

Customers

Broadcast Facility

Broadcast Facility

WorldSpace Satellite

Customer

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LAYOUT FOR DATABROADCAST

Satellite

128 Kbps

World Space Server,Singapore

(currently)

PC Card with built-in

Receiver &

DDA

OPTION-2

PC

INTERNET

WORLD SPACE

RECEIVER

64Kbps Local Leased line Connectivity

DDA

Uplinking

Antenna

PC

OPTION -1

Remote Sites

Dedicated 64Kbps link

to be provided by VSNL

IMD Server,Delhi

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