Re: ARLA/CLUSTER: Novo satélite militar pode revolucionar as comunicações no campo de batalha

[carlos santos]

No dia 28 de Setembro de 2011 13:02, João Gonçalves Costa <
joao.a.costa  ctt.pt> escreveu:

> New satellite could revolutionize battlefield communications****
>
> ** **
>
> The National Journal reports that the Naval Research Laboratory plans to
> launch an experimental $75 million satellite this week that U.S. ground
> forces can use for on-the-move communications with standard military
> handheld or backpack radios.****
>
> ** **
>
> The Tactical Satellite-4 (or TacSat-4) will zoom around Earth in an
> elliptical orbit at altitudes ranging from 435 miles to 7,470 miles, keeping
> the spacecraft far closer to the ground than the 22,000-mile orbit of
> geostationary communications satellites, according to the Operationally
> Responsive Space Office at Kirtland Air Force Base, N.M., which funded the
> launch and first six months of use.****
>
> ** **
>
> Michael Hurley, head of spacecraft development for the Naval Research Lab,
> said in an e-mail from the TacSat-4 launch site in Kodiak, Alaska, that the
> low orbits will allow ground forces for the first time to communicate with a
> military satellite using omnidirectional antennas on their radios while on
> the move, rather than stopping to set up a satellite antenna.****
>
> ** **
>
> TacSat-4, Hurley said, will support troops in Afghanistan equipped with
> An/PRC-148 and AN-PRC-152 handheld radios, manufactured by Thales and Harris
> respectively, and the Harris AN/PRC-117 backpack radio, as well as the
> AN/PSC-5 portable satellite terminal from Raytheon used by special-forces
> units. ****
>
> ** **
>
> Hurley said that all these radios communicate with TacSat-4 in one of 10
> channels in the 240-318 MHz band, which is also used by the Defense
> Department's geostationary ultra-high frequency satellite constellation.**
> **
>
> ** **
>
> Read the full National Journal article New Satellite Could Revolutionize
> Battlefield Communications ****
>
>
> http://www.nationaljournal.com/nationalsecurity/new-satellite-could-revolutionize-battlefield-communications-20110927
> ****
>
> ** **
>
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