Have a look here on “Space Based ADS-B” using cluster of Satellites to cover entire Globe: Land + Oceans
http://www.ads-b.com/space-based.htm
These are the links I found. There may be many more.
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jontio.zapto.org/hda1/jaero.html
JAERO is a program that demodulates and decodes Classic Aero ACARS (Aircraft Communications Addressing and Reporting System) messages sent from satellites to Aeroplanes (SatCom ACARS) commonly used when Aeroplanes are beyond VHF range. Demodulation is performed using the soundcard. Such signals are typically around 1.5Ghz and can be received with a simple low gain antenna that can be home brewed in a few hours in conjunction with a cheap RTL-SDR dongle.
This is ACARS, not ADS-B
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It’s a bit of a stretch to call this “Space based ADS-B” IMO. It requires you to install an additional $40,000+ box on the aircraft that receives ADS-B and relays it through a satellite constellation. It’s not an ADS-B receiver in space that requires no additional hardware on the aircraft.
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https://www.radarbox24.com/blog/space-based-ads-b
Timeline
Q4 2017 - Test Satellites Active
Q3 2018 - Full Coverage between North 30 and South 30
Q4 2018 - Partial Polar Coverage
Q2 2019 - Full Worldwide Coverage (Space Based ADS-B)
The RadarBox, FR24 are partnering with GOM and the ESA for this space based ASDB system using nanosat technology. These satellites are the size of a large fruit with much less capabilities than full sized satellites.
ESA link:
Gom link:
https://gomspace.com/Shop/payloads/aircraft-tracking.aspx
There are a few universities that did studies on the performance of the prototype systems (search for GOMX-1).
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What is the status/update on this one?
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On the Aireon data? There are 30 iridium-next satellites in orbit now (most recent launch a few days ago: http://www.spacex.com/news/2017/10/09/iridium-3-mission) and we have live data from some of those (some are still being commissioned)
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this esa project looks like the final step to fill the earth orbit with space junk 
but what else one could await from the eu …
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Decay lifetime of cubesats at 600km is probably <10 years so they’re not going to be there forever…
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but what happens then to them? i was afraid that some of them could fail → leave their position → collide with another => and all this could then escalate like a snowball-system
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Their orbits decay over time and they eventually fall back into the atmosphere and burn up. Generally new LEO satellites are designed to do this within at most 25 years.
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We’ve got the data flowing from the active Aireon payloads and we’re doing demos now for prospective customers.
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Bye Bye RPi, FF, Radarcape etc soon…
No more faup & piaware, pfclient, fr24feed, rb24feeder,
Nah, our terrestrial network will still provide higher update rates, lower cost positions, surface movement, etc.
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understand - but to be honest i’m extremely sceptic about everything the consortium of airheads aka eu-brussels does or plans …
GOMX-1 is a 2U cubesat which is 100mm x 100mm x 227mm, max mass 2.66kg. So maybe a melon? 
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