User Guide

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Term
Definition
Fig. 3: Electrical crosstalk
Detection
A detection, also called “echo,” is defined by distance, amplitude, channel index,
timestamp, and flag.
Distance
Distance to an object measured in the segment (in meters) from the reference point.
Range: 0 to Instrumented Range.
Flag
Information relative to detection quality (bit field).
FoV
Field of view
GPS
In autonomous navigation systems, the GPS provides a clock signal that can be used
to synchronize various systems.
LCA
LeddarCore Automotive product family
NIR
Near-infrared light
Object
Objects, people, or animals (moving or stationary). Throughout this document, all
these elements will be referred to as “objects.”
Parasite ripple
A ripple that occurs following a strong detection.
PPS
Pulses per second. Signal used as a time reference by the central system to
synchronize multiple sensors together with the GPS to increase the accuracy of
perception.
PTP
Precision Time Protocol. Used to synchronize clocks throughout a computer network.
Segment
A vertical (V) and horizontal (H) index in the FoV. Synonym of “channel.”
SoC
System on chip
Timestamp
(32 bits)
Time, in milliseconds (ms), elapsed since the sensor was powered on. Range: 0 to
2
32
– 1. It will restart at 0 within 49 days of continuous operation.
Timestamp
(64 bits)
Time elapsed since 00:00:00 UTC on January 1, 1970 (also called UNIX Time).
Expressed in milliseconds (ms) by default but can be configured to be expressed in
microseconds (µs) for more precision. Range: 0 to 2
64
– 1.
Optical and Electrical Crosstalk
In autonomous driving scenarios, a multitude of variable reflective objects may be present and will affect the
performance levels of the LiDAR system. Highly reflective objects may cause detrimental effects in the
detection system due to optical reflections or artefacts in the electronics. The next few paragraphs explain
some of these issues and the LeddarSP’s capacity to overcome them.