- 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"
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.
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!
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).
Iridium (3) - Satellite
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
Iridium (4) - Network Overview
Complex network configuration - explain briefly the key components.
Iridium (5) - Crosslink Routing
-Call routing across and along planes
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!