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Sensors

Urban vertical development a challenge for AVs

Lawrence ButcherBy Lawrence ButcherJuly 16, 20203 Mins Read
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Autonomous vehicles could face signal black-out caused by urban canyons in cities across the world due to the continued growth of skyscrapers and urban infrastructure, according to Oxbotica – a UK-based developer of autonomous vehicle software.

Urban canyons are formed when a street is densely populated by tall buildings on both sides. This can cause the GPS signal at ground level to be degraded or lost, either through satellite signals being obscured or through multipath effects: a phenomenon where radio waves bounce off surroundings and form multiple signal paths.

The company said that the number of tall buildings (above 200m) around the world has risen by 650% in the last five years and is set to increase again by up to 20% in 2020, meaning the frequency of urban canyons is set only to grow.

Interruption of GPS signals, through connection drops or multipath degradation, has potential safety and operational implications for autonomous vehicle systems that rely heavily on satellite-based navigation. Even a standard three-story building is enough to create signal disruption at ground level. The problem is worse at higher latitudes where satellites tend to be lower in the sky. If no suitable fallbacks are in place, the company said, this can affect autonomous vehicles in these environments, including mass transit shuttles, buses, city delivery vehicles and cars.

However, canyons are not the only issue with GPS dependency. Oxbotica highlighted that sunspots formed during the sun’s 11-year magnetic field cycle cause marked changes in the solar wind. This affects the upper atmosphere which can in turn interfere with GPS satellites. The solution, it said, is to use a mix of radars, cameras and lasers to navigate and localize rather than relying solely on GPS.

Paul Newman, CTO and founder at Oxbotica, said, “My first job was in the maritime positioning industry where we were providing alternatives to GPS positioning systems for ships and oil rigs in the Gulf Of Mexico two sun-cycles ago. Now I’m in conversations about the same problem hitting autonomous vehicles on our roads, and in our mines (top) – on top of being in any number of canyons.

“While it is harder to figure out your location using vehicle-mounted sensors rather than being told it by GPS, the rewards are many. Entirely new commercial opportunities open up – working underground is no different to a high street, an autonomous shuttle is no different to a haulage truck in a mine. This is a powerful concept and underpins our Universal Autonomy software platform.”

Oxbotica noted that its autonomy technology is able to work independently of any external infrastructure, enabling continuous localization and safe control of its vehicles – even without a GPS signal. The localization system is not reliant on a single sensor modality, and instead uses a mixture of radar, laser and vision sensing to deliver autonomous operation in a vast range of settings, on any vehicle platform, under any conditions.

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