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

ICO

SLIDE 21

ICO (1)

-Proposal of INMARSAT - International Mobile Satellite Operator

-MEO Constellation

  • 10 satellites in 2 planes
  • 10,355 km (6 hour) orbit
  • 45 inclination

-Transparent Transponder

Notes:
In "competition" to Iridium is another proposal - ICO. Named after the choice of "intermediate circular" orbit proposed by INMARSAT - the long established mobile satellite operator.

SLIDE 22

ICO (2) - Constellation

Notes:
Orbit configuration is quite different from Iridium - only two planes, fewer satellites, coverage and handover will be very different especially satellite to satellite handover much less frequent.

SLIDE 23

ICO (3) - Constellation Coverage

Notes:
This shows the instantaneous global coverage of the constellation. Note that in general most highly populated areas are covered by a number of satellites simultaneously... important for redundancy and to deal with blocking. Generally 2 but sometimes 3 or even 4 satellites will be visible to a user and a SAN (satellite access node) at a time. Constellation gives high elevation angles (40-50) which is key for avoiding blockage.

SLIDE 24

ICO (4) - Satellite Coverage

-Coverage from a single satellite

-163 beams

Notes:
Each satellite has a complex multi-feed, multi-spot pattern. Frequencies can be reused many times. Bandwidth can be reallocated to key beams

SLIDE 25

ICO (5) - Satellite

  • Based on Hughes HS601 GEO bus
  • Digital beam forming
  • Digital channelisation
  • Supports 4,500 phone channels

SLIDE 26

ICO (6) - Network Configuration

Notes:
Users correspond with the space segment these then route calls through ICONET, an interconnected network of 12 SANs (Satellite Access Nodes). Gateways route calls onto the terrestrial network at most convenient point.

Next: Section 6 - Globalstar

 
 

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