Towards the Personal Communicator

Presentation / Towards the Personal Communicator

Date Submitted: 06 June 2001

Written by RPC Telecommunications. Website: http://www.rpctelecom.com

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A short lecture presented to the Surrey Section of the IEE (the IEE is the British Institution of Electrical Engineers) by Mark C J Posen of RPC Telecommunications Ltd.

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 Printable Version
-Section 1
"Beam Me Up Scottie"
-Section 2
Concept
-Section 3
Orbit Mechanics
-Section 4
Iridium
-Section 5
ICO
-Section 6
Globalstar
-Section 7
Implementation & The Future

Iridium

SLIDE 16

Iridium (1)

  • One of the first S-PCN proposals
  • Backed by Motorola
  • 66 satellites (originally 77) in 6 planes
  • ~780km polar LEO
  • Processing transponder
  • Complex network with in-space routing through ISL "crosslinks"
  • TDMA

Notes:
This was one of the first. Designed to be a satellite based wireless personal communications network supporting all kinds of services - voice, data, fax and paging.

SLIDE 17

Iridium (2) - Handset

  • Handset based on Motorola cellular technology
  • Little data publicly available!
  • Iridium state 1 hour talk time and 24 hours standby
  • Note the antenna!

Notes:
We've seen that the design is handset driven so lets look at the Iridium handset... it looks much like any "regular" cell phone (slide).

SLIDE 18

Iridium (3) - Satellite

Notes:
Developed by Motorola Satcom Division. 689kg. Complex "antenna farm" communications cross-link gateway. Around 5 years lifetime over 1 satellite per month built and launched "for ever". Effectively makes satellite construction into a production line business. In passing Teledesic proposal has 840 satellites in orbit - 10 - 15 per month!!! FOR EVER!

SLIDE 19

Iridium (4) - Network Overview

Notes:
Complex network configuration - explain briefly the key components.

SLIDE 20

Iridium (5) - Crosslink Routing

-Call routing across and along planes

Notes:
Worth mentioning the unique feature of the Iridium proposal. Call routing in space through "crosslinks" calls routed along a plane and between planes mention counter-rotating planes. Problem of routing across this boundary this feature makes Iridium very different and may pose some complex technological problems!

Next: Section 5 - ICO

 
 

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