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Solid-State LiDAR Empowers ADAS, Autonomous Driving
Leuven-based XenomatiX provides what it calls "true solid-state LiDAR sensors" based on a multi-beam lasers concept and risk-free, scalable, semiconductor technology
www.eetimes.eu, Jul. 07, 2021 –
Challenging automotive applications, such as ADAS and autonomous driving, require advanced solutions for range and objects detection. Among these, a relevant role is played by the LiDAR (light detection and ranging) system. Also known as time-of-flight (ToF), laser scanner or laser radar, LiDAR is a sensing technology whose main task is to detect objects and map their distances. This is achieved by illuminating a target with an optical pulse (whose width ranges from a few nanoseconds to several microseconds) and measuring the characteristics of the reflected return signal. Key factors for extracting useful information from returned light signals are pulse power, round-trip time, phase shift, and pulse width. Even though several different types of LiDAR systems are available, they can be grouped into two categories with respect to the beam steering type: mechanical and optical LiDARs. A mechanical LiDAR relies on high-grade optics and a rotating assembly to create a wide field-of-view (FOV), up to 360°. The associated signal-to-noise ratio (SNR) is quite excellent over the FOV, but the solution is bulky and heavy. Solid-state LiDARs, on the contrary, feature no spinning mechanical parts, providing a high degree of reliability. Even though their FOV is reduced, there is a way to overcome this limitation.
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