Leddar Solid-State LiDAR Technology Fundamentals

in a nutshell

Leddar is a proprietary LiDAR (acronym for light detection and ranging) technology that can detect, locate and measure objects, including liquids and people, in a given field of view. It is essentially an ensemble of software, algorithms and know-hows that are used to design or optimize various types of solid-state LiDAR sensors. The Leddar technology has been created, developed and commercialized by LeddarTech.

In the remote sensing technologies taxonomy, it is part of the active time of flight category, along with other technologies such as radar or ultrasound.

About LiDAR technology

The primary function of LiDAR sensors is to measure the distance between itself and objects in its field of view. It does so by calculating the time taken by a pulse of light to travel to an object and back to the sensor, based on the speed of light constant.

lidar technology basics

As the pulses of light sent by a LiDAR hit objects of irregular shapes with various reflective properties, the incident light signal gets scattered, so that only a small fraction of the light returns back to the LiDAR receiver.

Mechanical scanning LiDARs
Scanning LIDAR’s solution to the reduced signal intensity is to use a powerful collimated laser source and concentrate the return signal on the detector through highly focused optics. By physically rotating the laser/receiver assembly, the mechanical scanning LiDAR is able to collect data over a wide area (up to 360 degrees). A typical mechanical scanning LiDAR is bulky, fragile and costs several thousands of dollars.

Solid-State LiDARs
New solid-state designs are being developed to solve the cost, size, reliability and complexity issues of mechanical scanning LiDARs. Built with no mechanical components, solid-state LiDARs (SSL) do have some limitations in field-of-view coverage (usually not exceeding 90 to 120 degrees), but their lower cost provides the possibility of combining two or more sensors to increase the area covered and meet the specific requirements of the intended application.

leddar solid-state lidar: key differenciators and benefits

Leddar™ is a solid-state LiDAR technology that uses patented signal acquisition and processing techniques to generate a cleaner return signal. This enables lower detection thresholds, for significantly increased range and sensitivity over other solid-state LiDAR methods.

 

leddar technology schema differentiators

 

VIDEO:Representation of a Leddar sensor signal accumulation and digitalization

 

Leddar generates a 25x improvement in sensitivity over other LiDARs, thus working with lower cost components while meeting performance requirements

 

 

Leddar technology key benefits

leddar benefit 1 sensitivity
leddar benefit 2 weather
leddar benefit 3 interference

 

Leddar from ICs to modules

from leddarcore ICs to complete sensor modules

Leddar can be delivered as an integrated circuit (IC) or assembled into sensor modules, depending on the application and the level of integration required by the client.

LEDDARCORE

All Leddar sensors are built around the LeddarCore integrated circuits, which contain LeddarTech’s patented signal processing technology and algorithms.

OPTICAL COMPONENTS

In addition to the IC, all Leddar sensor modules need an emitted light source (e.g., LED, VCSEL or Laser), a photodetector to receive the backscattered light, and optical components such as lenses or MEMS micromirrors to emphasize both the emission and reception signals.

ELECTRONICS AND PACKAGING

Additional elements must be added to build fully functional, complete Leddar-powered sensors: processing, communication interfaces, packaging and power management, depending on the intended application, provides the required functionality to integrate into the final system.