I am not sure that LEO are a good answer.  Have you thought about how many
satellites you will need.  I would guess around  5 or 6 in the orbit trace.
The second problem will be the handover of the data between the satellites.
( I think this was one of the things that killed Teledisc)
This means either cross links or a single hub that all satellites can see
and the routing is on the ground.   A third concern would be that
utilization.  Most of the time they would not be over Australia.  
A better idea would be a set of towers along the route like 3rd generation
mobile system.  While the standards only give 2Mbps for fixed station unless
you are talking about a bullet train, I think they could be considered as
stationary.  It will take a little thought. 
Depending on the services offered, you might be able to use part of a GEO
transponder to feed the 3rd Gen Mobile from a single access point. 
Harry Smith 
Lockheed Martin Mission and Data Services
408 - 473 6491
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Harry Smith
408 473 6491
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