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Nimrod Kapon - Oasis Networks
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L-band on Geostationary satellite?
26th Sep, 2017 at 3:23pm
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Dear community,

Can you please share your knowledge about L-band beams in geostationary satellite?

I am not talking about the L-band used in the IFL, but geostationary satellites that have L-band beams.

Are there many satellites like those?
What equipment/applications are used using the L-band beam?

Thank you!
Nimrod
  
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Re: L-band on Geostationary satellite?
Reply #1 - 27th Sep, 2017 at 1:33pm
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Inmarsat is the main operator.

Can anyone please do a write up here about Inmarsat.

Also can someone please write up all the possible L band applications. I guess machine to machine (M2M) communications with low bit rates and millions of terminals is the up and coming future application.

Meanwhile I have written this below for Thuraya.

Thuraya has two similar satellites in orbit, THURAYA-2 and THURAYA-3.
Satellite locations 44E and 98.5E. Both are in somewhat inclined orbit, about 4 to 5 deg.

Each uses C band for gateway connection and L band for customer spot beams. Capacity is 13750 phone calls using portable Thuraya handsets.

Thuraya L band satellite coverage extends from Northern Europe to Japan and down to Zambia in Africa and across to all Australia.  Weaker coverage includes Botswana and Siberia. Look at the spikey dark blue spot beam edges here: http://www.thuraya.com/network-coverage

The L band satellite antenna has 128 feeds, in a 9 x 13 array with triangular grid, with power and phase of signals on each feed controllable so as to direct power where it is needed, providing an approximation to over 200 spot beams.

The L band feed elements are explained here: https://www.ruag.com/sites/default/files/2016-12/Mobile_communication_Antennas.p...

The satellite uses a large deployable AstroMesh reflector approx 12.5m diameter. Read more: http://www.northropgrumman.com/BusinessVentures/AstroAerospace/Documents/pageDoc...

L band customer links
Earth-to-space 1626.5-1660.5 MHz
Space-to-Earth 1525.0-1559.0 MHz

C band hub gateway links
Earth-to-space 6425.0-6725.0 MHz
Space-to-Earth 3400.0-3625.0 MHz

Bus power 11kW.      
  

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Nimrod Kapon - Oasis Networks
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Re: L-band on Geostationary satellite?
Reply #2 - 27th Sep, 2017 at 10:45pm
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Thank you Eric!

As far as I understand, only Thuraya CPE can be deployed only with Thuraya satellite, and the same way, only Inmarsat CPE can be deployed with Inmarsat satellite.

Are there other geostationary satellite with L-band spots, and are there any CPE that can work with such satellites?

Kind Regards,
Nimrod
  
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Report on Prospects for L-band satellites for IoT and M2M
Reply #3 - 29th Sep, 2017 at 9:40am
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If you can afford to pay 4500 euros you can buy a report on the prospects for L band being used for Internet of Things (IoT) and Machine to Machine (M2M) communications.

The report by Euroconsult, provides an expert analysis. Reference is made to Iridium NEXT (under deployment), Inmarsat's I-6 (expected in 2020), Thuraya's next generation constellation (planned for 2020 but no satellite yet ordered) and a new generation of hybrid networks from Globalstar and Ligado Networks.

More details here: http://www.euroconsult-ec.com/shop/mobile-communications/98-lband-iot-m2m.html
  

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Re: L-band on Geostationary satellite?
Reply #4 - 30th Sep, 2017 at 2:36pm
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Thank you Eric!
  
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Nimrod Kapon - Oasis Networks
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Re: L-band on Geostationary satellite?
Reply #5 - 15th Oct, 2017 at 5:08am
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Dear Eric and all,

After some further research, I have learnt about GNSS augmentation, which can be used by geo satellites as well (SBAS).

More information can be read here:

https://en.wikipedia.org/wiki/GNSS_augmentation

Kind Regards,
Nimrod
  
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