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NEWS | Aug. 26, 2014

New York City Tracks Firefighters to Scene with NRL Radio Tags, Automated Display

By Kyra Wiens

On 15 of its vehicles, Fire Department New York (FDNY) now can automatically see which firefighters are nearby from the onboard computer, and relay that information to the city's Operations Center. The system was invented by David DeRieux of the U.S. Naval Research Laboratory (NRL) Space Systems, along with Michael Manning of Manning RF, and in close partnership with FDNY.

Since the 9/11 terrorist attacks, New York City has been pursuing ways to better coordinate the 14,000 firefighters and emergency response it employs. (Prior to 9/11, the FDNY used a paper/carbon-copy ride list—Battalion Form 4 (BF4)—to account for who's present.)

NRL's system is based on an active radio frequency identifier (RFID) tag carried by each firefighter, similar to E-ZPass or how retail tracks inventory. It's in a little sealed plastic—it looks like a little key fob, actually, says George Arthur, an NRL engineer who contributed to the project. They're positioned over the left breast, inside the bunker coat in a little Kevlar pocket that's sewn in there. And it just sends out a little ping every five seconds: here I am, here I am, here I am.

A radio receiver on the vehicle picks up the pings and builds a table of identifiers. It just listens and says, 'Okay, 1234, that's Jessica Smith,' so we know Jessica Smith is nearby, says DeRieux. Periodically, a program that's running on their MDT [mobile data terminal], their onboard computer, quizzes this reader and says, 'Let me have everything.'

The table of every firefighter on or near the vehicle is displayed on the MDT screen. As soon as [the driver] turns the ignition on, says DeRieux, this thing comes up. When they get on the scene, everyone takes off, they all disappear. Then eventually they come back for a roll call situation, and the captain can tell instantly everyone is within so many feet of the truck.

The MDT also sends this accounting to the FDNY Operations Center in Brooklyn, using a commercial modem. They actually have a massive display, twice the size of my wall, says DeRieux, and on there this data gets projected. So they know what truck just showed up on scene, who was on the truck. To coordinate personnel during a city-wide disaster, this real-time information would be unimaginably valuable. During 9/11 there were thousands of firefighters, it was a big problem, says DeRieux.

The data is also archived. If there were a HAZMAT release, says Arthur, they could go back and immediately see the firefighters that were on duty.

On April 23rd, the Federal Laboratory Consortium awarded NRL for Excellence in Technology Transfer. Technology transfer is very important, says Arthur. Doing things here [at NRL] that are beneficial, not just to the warfighter, but also to the average citizen.

Firefighters gave feedback to NRL throughout development

NRL worked closely with FDNY throughout the years of development. They gave us very good feedback, says Arthur. They'd say, 'That's kind of what I want, but can you do this and can you change that?' They pretty much knew what they wanted and that was just all the difference in the world.

They also had the opportunity to spend time in New York getting to know the firefighters and their needs, and see them in action. They're an impressive bunch to talk to, very big-hearted, says Arthur. There's one guy, Chief [of Logistics Ronald] Spadafora, who's got this thick Brooklyn accent, rides a Harley to work. Well he's got two Masters degrees, he flies all over the world [giving] lectures on fire science. He's written a couple books.

The relationship started with a fortuitous meeting in 2002. I recognized the guy next to me, says DeRieux. Turns out, his name was [Battalion Chief] Joe Pfiefer. Pfiefer was the first chief to take command on 9/11. [Pfiefer] brings me into his office and he says, 'We've got a problem. We need a way to keep track of our firefighters. Worse yet, some firefighters, who become dazed and confused during an operation, may not make it out of the building, or they end up in the wrong area for roll call.'

NRL's system was needed so the other truck would be able to automatically relay through the Operations Center, He's over at Engine number whatever so he's all right, says DeRieux. That's the intention with this device, to make sure everyone's accounted for.

Working with FDNY led to an unexpected spin-off: the city liked the program's interface so much, they asked NRL to make a similar drag-and-drop program they could use to schedule personnel assignments. Says Arthur, Now EBF4 is the standard scheduling tool New York City uses for their firefighters. NRL wrote it.

NRL got easy to use, reliable, and cheap hardware from industry

One of FDNY's primary requirements, says Arthur, was, It has to be easy to use, reliable, and cheap.

So DeRieux turned to Michael Manning, who had a private company already working on RFID, to provide the hardware for NRL's program. Says Arthur, All the hardware came off the shelf; the secret sauce is the software. Anybody can go out and buy the RFID components, but if they don't have our program it's just a bunch of dumb computer parts.

Using all off-the-shelf hardware kept costs low. The readers cost around $1,100 a piece in the quantities we buy them, that might come down a bit, says Arthur. The tags cost about $20 a piece.

The tags are active RFID; so, unlike passive RFID, the batteries will run out in three to four years, depending on how often they're programmed to transmit. But active gives greater range and the ability to transmit more data. Says Arthur, If you used the same amount of equipment, you could conceivably load it with the oxygen the guy had left, the temperature in the area.

Is the future to track personnel moving inside a building?

We have given them the piece that lets them track from the vehicle to the fireground or the event, says Arthur. If we could drop in a complementary piece, where we could track firefighters while they're in the building, that would save so many lives.

Indoor tracking, says DeRieux, it's a very tough nut to crack.

NRL's system is simply, I detect a signal or I don't—but an indoor system would need to pin a precise point in three-dimensional space. I've always said down to six inches, says Arthur, because that's the approximate width of a wall. You don't want to track a firefighter only to find yourself on the wrong side of a wall.

The tracking systems Arthur's reviewed start at a known, fixed point, then uses sensors to estimate where you've gone. Gyroscopes know which direction you're moving and there are movement sensors that estimate how fast you're moving. An altimeter tells whether you've gone up or down in the building.

He adds, But the problem is chaos. Say the system is accurate plus or minus an inch on each step. The firefighter's first step from the known point is accurate within an inch; but the second step is plus or minus an inch based on a guess that was also plus or minus an inch. And the longer you're out walking around, says Arthur, the more those inaccuracies compound.

Additionally, the firefighters may be behind metal walls, they may be 100 floors up from a data receiver, and an altimeter may not give reliable data because in a building that's on fire you're going to have all kinds of changes in air pressure.

A separate avenue of research, particularly if NRL were to put a new system in another city or perhaps aboard a naval ship to track fire control teams, would focus on improving the hardware. We started implementing this system in 2007, says Arthur, and everything's come a long ways since then. Today, there are passive RFID tags that, unlike FDNY's system, can last indefinitely. They're also ruggedized and wouldn't have to be removed before laundering.

Be it for U.S. Marines or firefighters, for talking to spacecraft or talking to Brooklyn, NRL is a place where engineers solve problems. Says Arthur, I'm kind of a nuts and bolts guy. I'm an engineer who can change a tire. I like to fix things, take things apart.

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