Does GPS need replacing?

Mark Piesing looks at the contenders hoping to plot a fresh navigational path.

Deep in the bowels of Edinburgh University, scientists are using a much talked-about – and talked-up – cutting-edge communication technology to answer the eternal question: "Daddy, are we nearly there?"

Professor Gordon Povey and Wired magazine pin-up Professor Harald Haas believe that visible light communication – or li-fi – can challenge the dominance of GPS, or the Global Positioning System. They believe they can use the light emitted from LED lightbulbs placed in buildings to transmit data, not only to download the latest film to a laptop, but also to tell us where we are with pinpoint accuracy. Just so long as we are in the line of sight of the light source.

For Povey, this is not merely some laboratory dream. "We don't have to wait for tomorrow's smartphone. We can already do things on today's phones that will use the low-speed visible light emitted from these LEDs to work out your exact position. So you won't have to stumble around a strange hotel for a GPS fix any more. You'll be able to see where you need to go."

The How Do They Do It? of this new technology is – not surprisingly – still stamped Top Secret. However, there are at least 15 other technologies engaged in the race to replace the elements of GPS on which we have come to depend. This race is perhaps inevitable, as some of the system's physical infrastructure and software is now more than 30 years old and ripe for "disruption".

Whatever the technology, these real-time locating systems (RTLS) are all about "triangulation", explains Professor Ajay Malik, former head of engineering for Motorola and author of RTLS for Dummies. In the case of GPS, this means your position is worked out to within a few metres' accuracy (depending on your handset), relative to four or more of the GPS navigation satellites visible to your device at a given time, out of about 30 satellites in total. Assisted GPS or A-GPS on mobile phones uses the computer power of the phone networks to help make these same calculations – if more slowly – when the radio signal from the satellites is poor.

Even though GPS has only really been embedded in our everyday lives over the past decade, its origins date back more than 70 years to the ground-based radio navigation systems that helped the Allied bombers to devastate Germany in the Second World War. In 1973 a group of US Army officers came up with the idea of a global satellite navigation system – although it would then take 21 years before the network's final satellite would be launched into orbit.

Before then, in a move that explains its great success, President Reagan decided to make GPS "free to everyone" after Korean Air flight 007 was shot down by the Russians in 1983, due to its having accidentally strayed into prohibited airspace. This apparent navigational error cost 269 lives.

Yet the "it sells itself" proposition that this great giveaway helped to create, perhaps, disguised the weaknesses of the system. While its accuracy is "good enough" for cars and "OK" for walkers, "any location technology has to be internally and externally ubiquitous," says Malik, "and not disappear the moment you enter a building or even the urban jungle." As well as its relatively weak signal and the time it can take to get a fix, "if you are running an application that uses GPS the battery runs out so quickly".

Not forgetting the vulnerability of GPS to hacking, spoofing and blocking by anyone from bored teenagers in Essex to the Chinese military, which is "only going to get worse" as "it is easy to do because GPS is freely available and popular".

Of course, GPS can be updated at great expense – GPS III is coming soon if it survives Obama's budget cuts – or it can be even "leapfrogged" by more advanced sat-nav technology.

Europe's Galileo system offers metre precision and the "major advance" of a Search and Rescue function, which, after a beacon has been activated, tells those waiting when help is on its way.

Or it can simply be replaced, for example by China's Compass and Russia's Glonass, regional navigational systems that are expected to go global by 2020. Similarly, Boeing rebooted its network of 71 Iridium low-orbit satellites by uploading new firmware, to create a cheap-to-set-up alternative to GPS called the Timing and Location Network, which broadcasts a powerful signal from a low altitude that can penetrate buildings.

Alternatively, there are more than 15 other technologies here or on the way. They range from tracking based on mobile phone masts to Bluetooth. They could provide, in the first instance, more accurate and reliable positioning within buildings or built-up areas, as they don't need to see the sky. Or indeed, a "hybrid" system that uses the best available signals.

Others include more radical technologies such as visible light communication and ultrasound (which may be bad news for dogs). Ultrasound uses small tags carried by an individual to transmit a unique acoustic signal inaudible to the human ear every five seconds, which is picked up by a receiver and the data transmitted to a server.

However, Professor Malik sees Wi-Fi as the "number one" alternative to GPS. Software developed by Boston-based Skyhook Wireless can work out your location relative to the more than 250 million Wi-Fi transmitters in the United States, Canada and Western Europe that they have been able to map out, covering 70 per cent of the population.

Yorkshireman Steve Page is sceptical of some of the claims regarding these new technologies. Page is CEO of Mobilecommerce, leading designers of "location" apps for brands such as the AA. "There is a big difference between what gets talked about in the press and by scientists, and what people actually are doing," he argues. "We have had only a few requests, mostly at the top end, for apps to be able to switch to Wi-Fi.

"After all," he says, "consumers just want three things from location technologies: find out what's around them, work out how to get there and how to find someone or something."

And GPS delivers all that.

Although "with a transmitter in almost every other house in my village, Page admits that a technology like Wi-Fi "could offer a reasonably accurate system", even if "there will always be the space in between" that will need something like GPS.

And of course, "there is always opportunity for people to come in and disrupt the market with stuff I hadn't even thought of."

Back in Edinburgh, Gordon Povey's location research may soon be spun-off from the university as there should be "some apps on modified machines available by the end of the year".

"There is still a role to play," he says, "for spin-offs and start-ups as minimal viable product developers who pioneer the applications, before companies like Samsung decide there is a market and buy them out.

"We are better at figuring out what needs to be done; big business is better at filing patents and getting intellectual property."

So if you have a few million to spare, it is not too late to invest.

Global positioning: A timeline

1940s Development of long range navigational systems like LORAN based on earlier British technology

1973 Global Positioning System first imagined

1978 First GPS satellite is launched

1983 Ronald Reagan decides to make GPS free-of-charge

1994 Initial network of 24 GPS satellites completed

1996 Clinton signs order formally recognising the dual use of GPS by civilians and the military

2000 Civilians get access to the higher-quality military signal

2001 First mobile phone with embedded GPS

2002 First TomTom product is released

2010 LORAN is turned off

2012 GPS on mobile phones to become standard

2014 First GPS III satellite is scheduled to launch

China's Compass

Both China and Russia (with Glonass) have their own navigation systems. Expected to go global by 2020.

GPS III

An update to the US GPS system will be a major advance on the previous GPS... if budgets allow

Boeing timing and location

Boeing's own systemsends a powerful signal from a low altitude

Galileo

The European Union and Space Agency's precise system features a "search and rescue" beacon

Wi-fi

A Wi-Fi triangulation system could work out where you're located between different Wi-Fi routers

LED (li-fi)

Scientists believe that they can use the light emitted from LEDs to define locations

Life and Style
ebookNow available in paperback
ebooks
ebookPart of The Independent’s new eBook series The Great Composers
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

ES Rentals

    iJobs Job Widget
    iJobs Gadgets & Tech

    Ashdown Group: Trainee Consultant - Surrey/ South West London

    £22000 per annum + pension,bonus,career progression: Ashdown Group: An establi...

    Ashdown Group: Trainee Consultant - Surrey / South West London

    £22000 per annum + pension,bonus,career progression: Ashdown Group: An establi...

    Ashdown Group: Recruitment Consultant / Account Manager - Surrey / SW London

    £40000 per annum + realistic targets: Ashdown Group: A thriving recruitment co...

    Ashdown Group: Helpdesk Analyst / Trainee Application Support Analyst - Essex

    £25000 per annum: Ashdown Group: A highly reputable business is looking to rec...

    Day In a Page

    Fishing for votes with Nigel Farage: The Ukip leader shows how he can work an audience as he casts his line to the disaffected of Grimsby

    Fishing is on Nigel Farage's mind

    Ukip leader casts a line to the disaffected
    Who is bombing whom in the Middle East? It's amazing they don't all hit each other

    Who is bombing whom in the Middle East?

    Robert Fisk untangles the countries and factions
    China's influence on fashion: At the top of the game both creatively and commercially

    China's influence on fashion

    At the top of the game both creatively and commercially
    Lord O’Donnell: Former cabinet secretary on the election and life away from the levers of power

    The man known as GOD has a reputation for getting the job done

    Lord O'Donnell's three principles of rule
    Rainbow shades: It's all bright on the night

    Rainbow shades

    It's all bright on the night
    'It was first time I had ever tasted chocolate. I kept a piece, and when Amsterdam was liberated, I gave it to the first Allied soldier I saw'

    Bread from heaven

    Dutch survivors thank RAF for World War II drop that saved millions
    Britain will be 'run for the wealthy and powerful' if Tories retain power - Labour

    How 'the Axe' helped Labour

    UK will be 'run for the wealthy and powerful' if Tories retain power
    Rare and exclusive video shows the horrific price paid by activists for challenging the rule of jihadist extremists in Syria

    The price to be paid for challenging the rule of extremists

    A revolution now 'consuming its own children'
    Welcome to the world of Megagames

    Welcome to the world of Megagames

    300 players take part in Watch the Skies! board game in London
    'Nymphomaniac' actress reveals what it was really like to star in one of the most explicit films ever

    Charlotte Gainsbourg on 'Nymphomaniac'

    Starring in one of the most explicit films ever
    Robert Fisk in Abu Dhabi: The Emirates' out-of-sight migrant workers helping to build the dream projects of its rulers

    Robert Fisk in Abu Dhabi

    The Emirates' out-of-sight migrant workers helping to build the dream projects of its rulers
    Vince Cable interview: Charging fees for employment tribunals was 'a very bad move'

    Vince Cable exclusive interview

    Charging fees for employment tribunals was 'a very bad move'
    Iwan Rheon interview: Game of Thrones star returns to his Welsh roots to record debut album

    Iwan Rheon is returning to his Welsh roots

    Rheon is best known for his role as the Bastard of Bolton. It's gruelling playing a sadistic torturer, he tells Craig McLean, but it hasn't stopped him recording an album of Welsh psychedelia
    Morne Hardenberg interview: Cameraman for BBC's upcoming show Shark on filming the ocean's most dangerous predator

    It's time for my close-up

    Meet the man who films great whites for a living
    Increasing numbers of homeless people in America keep their mobile phones on the streets

    Homeless people keep mobile phones

    A homeless person with a smartphone is a common sight in the US. And that's creating a network where the 'hobo' community can share information - and fight stigma - like never before