LiDAR (Light Detection and Ranging) technology, which has emerged as a key technology in automobile safety, is seeing farther, reacting faster, and greatly improving driver safety.

In today's high-speed traffic environment, LiDAR plays a pivotal role in detecting invisible hazards in advance to prevent collisions and enhancing the precision of driving assistance systems.

According to a recent technical article by Texas Instruments titled “LiDAR Leaps: Precise, Long-Range Sensing Capabilities Lead to Safer Vehicles,” today’s lidars are able to see farther, react faster, and take evasive action more effectively when faced with a critical threat.

First, the basic principle of LiDAR is the 'time-of-flight method', which fires a laser pulse into the air and measures the time it takes for the light reflected from an object to return.

This method can detect objects hundreds of meters away in real time while ensuring precision in units of 1 cm.

In recent years, nonvolatile memory and high-speed ADC (analog-to-digital converter)An integrated system-on-chip (SoC) design that combines a sensor module and a power supply is introduced, achieving miniaturization of the sensor module and low-power operation.

A single LiDAR head can now perform 360-degree scanning, allowing the vehicle to monitor its surroundings without blind spots.

While existing Doppler radar or camera-based systems are limited by light or weather conditions, LiDAR maintains stable performance even in rainy weather or at night.

In particular, it uses lasers in the 905 nm and 1,550 nm bands that minimize diffraction and scattering, allowing it to clearly capture objects even in fog and snowstorms.

In this way, the high-resolution 3D point cloud acquired by LiDAR is transmitted to the electronic control unit (ECU), which is the brain of autonomous driving and ADAS (advanced driver assistance systems).

Here, AI algorithms instantly classify pedestrians, bicycles, vehicles, road signs, etc. and adjust driving routes in real time.

Functions such as emergency braking, lane keeping, and blind spot warning have become more sophisticated, allowing for a more agile response to unexpected situations.

When riders can see further and react faster, it means drivers can recognize hazards sooner and respond appropriately.

For example, it can warn of a slow-moving vehicle 150 meters ahead on a highway or a pedestrian who suddenly appears with a delay of less than 10 milliseconds.

Drivers can prevent collisions in the first place by ensuring sufficient deceleration distance.

From a marketing perspective, LiDAR is also attracting attention as a keyword that promises a ‘collision-free future.’

Major automakers and parts suppliers are emphasizing in emails and presentations that “LiDAR is the key to next-generation safety technology.”

Just a warning Rather, it is conveying the message that it satisfies both safety and convenience by integrating active suspension adjustment, steering assistance, and adaptive cruise control (ACC).

The evolution of technology doesn't stop here.

FMCW (Frequency Modulated Continuous Wave) LiDAR overcomes the limitations of existing pulse methods and significantly improves detection range and resolution.

Like radio-based radar, it precisely calculates relative speed by utilizing the Doppler effect, so it does not miss the speed difference of an overtaking vehicle while driving.

In a complex sensor fusion environment, lidar, camera, and radar information are combined to complete a safer driving solution.

Across industries, cost reductions and productivity improvements for laser sources, optical components and mobile computing units are key.

Mass production has become possible with the application of miniaturized MEMS (micro-electromechanical systems) scanners and photonic integrated circuit (PIC) technology, and in the future, LiDAR is expected to be installed not only in passenger cars but also in two-wheeled vehicles, commercial vehicles, and even bicycle helmets.

A TI official said, “The ‘long-range view’ and ‘fast response’ provided by LiDAR are not simple convenience features. They are essential safety devices developed for decades to increase driving distance without major accidents, and they are becoming mandatory safety regulations for all new cars starting in 2025.” He added, “Drivers can identify invisible dangers in advance with LiDAR’s eyes, allowing them to drive more freely and safely on roads without protective barriers.”