Menu
Drones get bad cell service, but an old ambulance will help

Drones get bad cell service, but an old ambulance will help

Researchers at Carnegie Mellon University are building a model of cell coverage up in the air

A view of Carnegie Mellon University's Crossmobile seen from a drone during a field test.

A view of Carnegie Mellon University's Crossmobile seen from a drone during a field test.

In the race to get drones into the sky and zipping across cities delivering packages and snapping photos, cellular networks are quickly emerging as the preferred way of keeping them in touch with the ground.

But researchers are finding that getting a reliable signal a hundred meters up in the air isn't as easy as it might seem, and that could present a challenge for companies like Amazon, which want to fly drones over distances greater than WiFi or similar technology allows and maintain contact with the craft during their flight.

The problem is that cellular networks are designed to provide coverage at ground level -- where the customers are -- and not up in the air. Take a look at any cellular base station antenna and you'll notice its antennas points down, not horizontally or up.

Trying to predict the coverage of a base station is complicated, but that's where researchers at Carnegie Mellon University's Silicon Valley campus come in.

Using a converted ambulance and drones of their own, they have been investigating how cellular signals travel through the air and reflect off the ground and other objects to try to build an accurate model of coverage.

(See inside the ambulance in this video.)

"We've built into this old ambulance, a full cellular network," said Bob Iannucci, leader of the CyLab Mobility Research Center at the campus located at NASA's Ames Research Park at Moffett Field, California. "We have the ability to go anywhere, set up a big antenna, create what we call a cellular bubble of coverage, and connect that via satellite."

The group first started taking measurements the old way, by walking around, but then decided that a phone strapped to the bottom of a quadcopter would be easier.

"We discovered that the signal up there is pretty different from what you might imagine," said Iannucci, who was previously chief technology officer of Nokia and head of the company's research center.

So now, several times a year, Iannucci and his students travel to a remote location armed with an FCC license allowing them to operate an experimental radio system. They raise a pneumatic mast and antenna that have been fitted to the ambulance and power up the equipment. A rack of servers and radio gear inside the ambulance generates the cellular signal and a satellite antenna on the roof of the vehicle provides an Internet connection.

Students then climb up onto the roof of the ambulance and fly their drones, all the time capturing information about the cellular signal.

Recently, the group partnered with the U.S. Geological Survey to get detailed laser scans of the surrounding terrain. The hope is that the radio measurements and terrain map will lead to software than can more accurately simulate cell coverage in any given location.

"People think that 'if I can see the antenna, the signal must be great,' but that's not really true," said Iannucci.

The team didn't set out to map cellular coverage for drones, but the work could be important as regulatory hurdles are cleared for greater use of drones by the public and companies.

Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service. Follow Martyn on Twitter at @martyn_williams. Martyn's e-mail address is martyn_williams@idg.com


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags NASArobotics

Brand Post

How to become the best IT MSP

This article provides guidance for managed service providers (MSPs) that want to grow their business. It is also useful for any IT service provider looking to move from the break-fix model to managed IT services.

Featured

Slideshows

Reseller News Platinum Club celebrates leading partners in 2019

Reseller News Platinum Club celebrates leading partners in 2019

The leading players of the New Zealand channel came together to celebrate a year of achievement at the annual Reseller News Platinum Club lunch in Auckland. Following the Reseller News Innovation Awards, Platinum Club provides a platform to showcase the top performing partners and start-ups of the past 12 months.

Reseller News Platinum Club celebrates leading partners in 2019
Reseller News hosts alumnae breakfast for Women in ICT Awards

Reseller News hosts alumnae breakfast for Women in ICT Awards

Reseller News hosted its second annual alumnae breakfast for the Women in ICT Awards in New Zealand, designed to showcase the leading female leaders in the industry. Held at The Cordis in Auckland, attendees came together to hear inspiring keynotes and panel discussions, alongside high-level networking among peers. Photos by Gino Demeer.

Reseller News hosts alumnae breakfast for Women in ICT Awards
Reseller News Innovation Awards 2019: meet the winners

Reseller News Innovation Awards 2019: meet the winners

Reseller News honoured the standout players of the New Zealand channel in front of more than 480 technology leaders in Auckland on 23 October, recognising the achievements of top partners, emerging entrants and innovative start-ups.

Reseller News Innovation Awards 2019: meet the winners
Show Comments