What is Lidar Technology?

Spacecraft use it to measure distance. Farmers use it to work out which fields need fertilizer. Archaeologists use it to map topography. And, crucially for Uber Technologies Inc. and Alphabet Inc. Waymo, self-driving cars use lidar to navigate.

As carmakers and technology entrants scramble to develop autonomous vehicles, lidar has become a highly coveted technology. And now it’s at the center of a lawsuit pitting Waymo against Uber, the ride hailing seeking to create its own autonomous vehicle empire. Waymo, the self-driving car business of Google parent Alphabet, accused Uber of stealing its lidar designs.

Lidar is a radar-like system that uses lasers instead of radio waves to build a 3-D image of the surrounding landscape. Since satellite navigation systems are only accurate to within a 16 Feet and can be easily flummoxed by high rise and glass fronted buildings, autonomous vehicles require an array of other sensors to position themselves precisely and maintain awareness of nearby pedestrians, vehicles and other objects.

Lidar comprises a series of rotating, stacked lasers that shoot out at different angles. Each layer is called a channel, and is made up of two laser beams. The signal from each individual channel creates one contour line, and together, those lines generate a 3-D image of the surrounding environment. That means that, the more lasers in each stack, the higher the resolution. Velodyne, for instance, manufactures products with 16, 32 and 64 laser channels.

The main hurdle to lidar becoming a widely adopted technology in mass-produced cars is cost. A 64-channel unit from Velodyne can cost more than $50,000, while the lower end 16-channel product sells for $7,999. Since a car might require several lidar units, it quickly makes the cost prohibitive for anything but the most expensive luxury cars. Velodyne and competitors such as Quanergy Systems Inc. are working to reduce the price. That would be accelerated by major orders for mass market cars.

The appeal of lidar has prompted a race for the technology. Automotive supplier Continental AG bought a lidar business from Advanced Scientific Concepts Inc. in 2016, while France’s Valeo SA has teamed up with Canada’s LeddarTech to supply the product.