RE: ARLA/CLUSTER: Re: [CT-Com. & Tec.] Tecnologia que remonta à II Guerra Mundial volta a ser usada para apoiar os sistemas de GPS

[silvio leiria]

 KISS - Keep it Simple Stupid
73s
Silvio

ct1bpt

 
From: afterhours36  gmail.com
Date: Tue, 4 Nov 2014 21:19:50 +0000
Subject: Re: ARLA/CLUSTER: Re: [CT-Com. & Tec.] Tecnologia que remonta à II Guerra Mundial volta a ser usada para apoiar os sistemas de GPS
To: cluster  radio-amador.net
CC: radioamadores_algarve  yahoogrupos.com.br; ct-comunicacoes-e-tecnologias  googlegroups.com

Boa noite.

Fiquei curioso quanto ao sistema que fala, o KISS.

Já procurei na net mas não encontrei...pode dar uma ajuda?

E sim realmente, os novos sistemas, têm falta de uma ou duas redundâncias que sejam independentes de GPS ou Internet, um autentico calcanhar de Aquiles.

Pode ajudar Carlos?

73,


CS7AEL

2014-11-04 13:52 GMT+00:00 Carlos Mourato <radiofarol  gmail.com>:
Ora aqui está uma decisão inteligente. Os sistemas mais antigos, podem ser hoje considerados como "arcaicos" pelos mais jovens, que nem sequer entendem como funcionavam. No entanto, como eram sistemas bastante mais simples e principalmente independentes, a sua fiabilidade era de longe superior aos sistemas actuais. Podiam não ter um precisão de 2m, mas os 100m na melhor das hipoteses, eram mais que suficientes. Eu continuo a ser adepto do "KISS" Antigamente havia uma rede de VHF analógico para bombeiros, serviços florestais, ...Uma rede de ondas curtas para PSP, GNR etc, e tudo funcionava bem. Hoje existe um manancial de sistemas, que estão sempre com problemas começando pelo célebre SIRESP. Enquanto os decisores não se voltarem mais para sistemas "KISS" não se adianta muito, a não ser na área das negociatas.

Cumprimentos:  Carlos Mourato - Sines - Portugal
Best regards from:  Carlos Mourato - Sines - Portugal
Visite o meu canal Youtube em:http://www.youtube.com/user/CT4RK?feature=guide 

Visit my youtube channel at:http://www.youtube.com/user/CT4RK?feature=guide 





2014-11-04 13:43 GMT+00:00 João Costa > CT1FBF <ct1fbf  gmail.com>:
GPS back-up: World War Two technology employed



Technology developed during World War Two is to be used as a back-up for GPS.



The General Lighthouse Authorities (GLA) have announced that they have

installed a system called eLoran in seven ports across Britain.



The GLA say many critical instruments on ships use Global Navigation

Satellite Systems, and if they fail the consequences could be

disastrous.



The new system, which is ground rather than satellite-based, is

designed to be used in the event of a GPS failure.



"All vessels that sail today are massively dependent on GPS, " Martin

Bransby, research and radio navigation manager for the General

Lighthouse Authorities of the UK and Ireland, told the BBC's

technology programme Click.



"It is their primary means of navigation - and a massive number of

instruments rely on it too.



"If you don't have it, you are dead in the water."



Testing for eLoran has taken place in Felixstowe, the busiest

container port in the UK.



Each year, three million containers are brought in on some of the

biggest ships in the world.



Safely manoeuvring these vessels in this packed waterway is vital, and

currently the only way to do this is with the help of GPS.



Onboard the Galatea, a ship that is 80m (260ft) long, the GLA have

been finding out what happens if the satellite system goes wrong.



Martin Bransby demonstrates a GPS failure by pulling the plug on the

ship's receiver.



Within a few seconds, alarms start to sound on the bridge as one by

one the instruments stop working.



"This is the gyrocompass - it steers the ship - you can see it

starting to fail," says Mr Bransby.



"If we walk over here, this is the radar, and that's not working

either. This is the dynamic positioning: it holds the ship's position,

that's not working.



"The electronic chart display becomes unusable. Even the ship's clock

stops working."



In a series of tests, the GLA have found that almost every bit of kit

on the boat uses GPS - even the onboard satellite entertainment

system.



Mr Bransby says: "You can imagine standing watch on this ship, it's

the middle of the night, it's dark, it's foggy, you are in the English

Channel, and then this happens.



"What do you do? You're in a right mess, basically."



Read the full BBC News story at:

http://www.bbc.co.uk/news/science-environment-29758872



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