Leddar One Manual

Leddar™One Sensing Module 10
1.2. Underlying Principles
Created by LeddarTech, LEDDAR™ (light-emitting diode detection and
ranging) is a unique sensing technology based on LED illumination (in either
the visible or the infrared spectrum) and the time-of-flight of light principle.
The LED emitters illuminate the area of interest (pulsed at high frequency)
and the single channel sensor receiver collects the backscatter of the emitted
light and measures the time taken for the emitted light to return back to the
sensor. A single photodetector is used and provides a full-beam sensing
module. Full-waveform analysis enables detection and distance measurement
of multiple objects in the beam, provided that foreground objects do not fully
obscure objects behind them. Oversampling and accumulation techniques are
used to provide extended resolution and range.
Figure 3 illustrates the illumination area and detection segments of the
Leddar™One module.
Figure 3: Illumination Area and Detection Zone
The core of Leddar™ sensing is the pulsing of diffused light, collection of
reflected light (including oversampling and accumulation), and full-waveform
analysis. The light source type, the number of light sources, the illumination
and reception beam, and the number of photodetectors can all be tailored to