Utah firm wants to go where GPS doesn’t

By PETER SVENSSON, AP Technology Writer
Dec. 13, 2007

In one high-tech thriller after another, the hero attaches a tiny
tracking device on the villain and follows him as blinking dot on a
computer screen.

In real life, this kind of technology would be great for tracking
pets or kids, even packages or luggage — anything that tends to wander.

But it doesn’t really exist.

There are GPS devices, of course, but strap a half-pound GPS collar
to a dog and you’ll realize it’s far from "Mission Impossible."
GPS-enabled cell phones are becoming more common, but they have
problems, like accuracy indoors, and they aren’t cheap.

A Utah company, S5 Wireless, is looking to bring reality closer to
the movies, with small, cheap chips that can be powered by a single
battery for up two years and tracked indoors and outside, over long

For instance, an S5 chip could go into a dog collar, complete with a
battery, in a package about the size of a stick of gum that costs $3 to
$4 to make. When the battery runs down, it’s time to buy a new collar.

The same concept could be applied to a kid’s backpack, with an antenna running through the strap.

"It’s like a poor man’s LoJack or OnStar," said David Carter, S5’s chief executive.

The drawback to the technology is that unlike the Global Positioning
System, which is quite literally global, S5’s technology would only
work where the company has a network of stations to receive S5 signals.
S5 is planning to start building those in some major U.S. cities next

What the chips do is basically GPS in reverse. GPS satellites
operated by the Air Force send signals to receivers in devices like car
navigation systems. Those receivers need a line of sight to the sky, so
they work only outdoors, and are fairly power-hungry.

By contrast, the S5 chips send radio signals that will be picked up
by receivers S5 plans to build. By measuring the difference in the time
the signal takes to arrive at three different receivers, S5 can compute
the location of the sender to within about 30 feet outdoors, or 45 feet
indoors. The same principle can be used for locating some cell phones
in an emergency but is much less accurate. LoJack equipment also sends
radio signals from a stolen car, but it uses a lot of power and is
expensive compared to S5’s chips.

"The thing that struck me the most is that their solution allows for
very good indoor coverage," said Belgium-based analyst Dominique Bonte,
who covers GPS technologies for ABI Research.

Bonte said the weakness of GPS indoors vexes those who want to
provide location-based services, like cell-phone messages advertising
sales at nearby stores.

Companies like Intel Corp. have experimented with using Wi-Fi
hotspots in known locations to fill gaps in GPS. Some GPS devices
incorporate motion sensors that estimate the user’s location based on
movement after the GPS signal is lost.

"There’s a lot of activity, a lot of companies, and of course a lot
of venture capital which is being made available for those kinds of
initiatives," Bonte said. "There is a big belief that whoever comes up
with something that’s cheap, that works and is available will hit the
jackpot there."

To gain a foothold, S5 will give away the designs for its chips,
letting anyone make their own or incorporate the functions into
existing chips, like those in cell phones. It plans to make money by
charging for the location service, though at low rates, around $1 a
month, Carter said.

S5’s technology isn’t ideal for navigation devices, since the chip
doesn’t know where it is. It couldn’t, on its own, plot its position on
a map the way a car navigation system does. Instead, it is S5’s data
center that knows where the chip is.

If you’re tracking a dog — or a villain — that’s not an issue. The
dog doesn’t need to know where it is, but the S5 network can tell you
via Web browser or cell phone where it is.

Apart from pets and kids, Carter envisions the system being
used to track valuable equipment on construction sites and in
hospitals, much like LoJack protects cars.

If you don’t trust FedEx and UPS to track your package, you
could slip a tracking device into it before you ship it, and you’ll
know where it is. The company has also received grants from the
Department of Homeland Security to study the use of its chips in
tracking shipping containers. S5 chips could even be built into cell
phones to supplement GPS chips where reception is weak, like indoors.

As a bonus, S5 chips could transmit small amounts of data
generated by other devices. For instance, a diabetes patient’s glucose
meter could be monitored remotely.

S5 plans to piggyback on existing cell-phone towers and
antennas in building out its network, though officials would not say
how much they expect the build-out to cost. To pinpoint a chip’s
location, S5 needs three receivers within the signal’s range, about a
mile in cities, Carter said. The company plans to cover "several" major
cities next year and 35 cities within three years.

That’s a tall order, but the venture’s main backer lends it
credibility. Billionaire Craig McCaw, who founded one of the country’s
first cell-phone companies, is S5’s majority investor. He also backs
wireless broadband provider Clearwire Corp.

S5 hasn’t announced any build-out partners yet.

Remarkably, S5 plans to use free, unlicensed spectrum in the 900
megahertz band, which is already crowded by cordless phones. Steve
Chacko, S5’s director of product marketing, likened the feat of picking
up those signals from miles away to extracting a needle from a
haystack. But he said sophisticated low-power radio technology makes
S5’s plan viable. Its transmissions won’t interfere noticeably with
other devices using the spectrum, he said.


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