Troposcatter for Wireless Data

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Yaakov

Joined Jan 27, 2019
2,927
Looks like the technology that brought telephone and teletype circuits to the stations of the DEWLine (Distant Early Warning Line) during the cold war will be bringing "WiFi" to the battlefield.

They keep saying "WiFi" but I am not sure that's exactly what they mean, at least not directly. Nonetheless, this is pretty neat stuff.

https://www.raytheon.com/capabilities/products/troposcatter
 

nsaspook

Joined Aug 27, 2009
8,279
Looks like the technology that brought telephone and teletype circuits to the stations of the DEWLine (Distant Early Warning Line) during the cold war will be bringing "WiFi" to the battlefield.

They keep saying "WiFi" but I am not sure that's exactly what they mean, at least not directly. Nonetheless, this is pretty neat stuff.

https://www.raytheon.com/capabilities/products/troposcatter
Marketing droid speak.
 

Wolframore

Joined Jan 21, 2019
2,260
The troposphere is used to reflect communications beyond line of sight. I don't see what's so new about this except being used for WiFi. Makes sense. It gives you about 150 mile range.
 

nsaspook

Joined Aug 27, 2009
8,279
I figured as much. I just assumed that the S/N must already be really low to begin with -- and it wouldn't take much broadband energy to swamp the signal.
It's been tried on all sides. With the proper spectrum encoding of RF you can decode coherent signals below the background noise level. The trade-off is bandwidth. In the the Shannon-Hartley formula there is no stipulation that SNR" must be greater than 1.
https://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum
 

Wolframore

Joined Jan 21, 2019
2,260
On the other hand this subject does bring up some interesting points. WiFi means gateway to the world. Obvious issues with security come to mind, does this mean Netflix when people should be concentrating on more immediate issues? Will google help our soldiers in combat? Would it pose dangers?
 

joeyd999

Joined Jun 6, 2011
4,477
On the other hand this subject does bring up some interesting points. WiFi means gateway to the world. Obvious issues with security come to mind, does this mean Netflix when people should be concentrating on more immediate issues? Will google help our soldiers in combat? Would it pose dangers?
I doubt it's full duplex -- required for TCP/IP.
 

Wolframore

Joined Jan 21, 2019
2,260
Unless it’s linked to a mobile forward base. The article stated dual transmission. The more I read about this. More it sounds like a system I worked on about 30 years ago. Except WiFi and darpanet has advanced much more.
 
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nsaspook

Joined Aug 27, 2009
8,279

nsaspook

Joined Aug 27, 2009
8,279

Wolframore

Joined Jan 21, 2019
2,260
I just read they're still using the TRC170's... i did component level... it's a good chance you linked up to one if you were using tropo. It was very high tech back in early 90's... time for more high speed low drag. Hope the new ones are as dependable.
 
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