Such radar systems typically consist of laser emitters, optical receivers, information processors, and scanning systems. LiDAR provides rich information perception and processing capabilities, which are crucial for realizing advanced intelligent driver assistance functions. It can perceive and identify the road environment, plan driving routes, and achieve predetermined goals through precise control technology, much like the "eyes" of a car.
Did you know that many high-end cars are now equipped with a remarkable device called LiDAR? It allows cars to "see" farther, clearer, and more accurately, and can even achieve autonomous driving. So, what exactly is LiDAR? How does it work? Let's discuss it today, and perhaps discover some interesting tips you might not know!
LiDAR, short for Light Detection and Ranging, is a technology that uses lasers to detect and measure the position, shape, and speed of objects. The principle of LiDAR is quite simple: it emits a laser beam and receives the reflected signal. Based on the time difference and angle difference between emission and reception, the distance and direction of the object can be calculated. By continuously scanning the surrounding environment, a three-dimensional point cloud image, commonly known as a 3D map, can be generated.
What are the uses of LiDAR? It has wide applications in many fields, such as surveying, archaeology, military, aviation, and aerospace. However, for ordinary consumers, the most direct benefit of LiDAR is felt in the automotive industry. LiDAR enables cars to perceive their surroundings, such as adaptive cruise control, automatic parking, automatic braking, and obstacle avoidance. In the future, LiDAR may even enable fully autonomous driving, improving driving safety and intelligence.
So, does LiDAR have any drawbacks? Actually, yes. First, LiDAR is expensive. Even the cheapest LiDAR on the market costs several thousand yuan per unit, while high-end LiDAR is even more expensive. This can be a burden for most consumers. Second, LiDAR is complex. It requires high-precision mechanical structures, electronic circuits, and algorithm software to function properly, which increases the system's complexity and failure rate. However, it's believed that with technological advancements, it will become more affordable and better suited to our usage habits!
LiDAR, also known as laser radar, stands for "light detection and ranging." This technology uses infrared light or lasers to create 3D images of the environment. NASA initially developed LiDAR to monitor the position and path of satellites in space, but as the technological gap narrowed and continued to develop, ground applications related to automotive safety technology and the development of autonomous driving systems emerged.
The core function of LiDAR is to act as the eyes of a vehicle, allowing it to always "see" in all directions. With its ability to map the world in real time with 360 degrees, LiDAR helps vehicles identify objects on or near roads to avoid collisions with pedestrians, cyclists, animals, and other stationary/moving vehicles. LiDAR uses the same lasers found in everyday applications, such as retail barcode scanners and concert light shows; this laser technology is safe and harmless.
A vehicle's LiDAR sensor emits individual particles of light, called photons, which strike nearby objects such as cars, pedestrians, and trees. The photons then bounce back to the sensor. The LiDAR system records the round-trip data for each photon, measuring the distance and time to each object near the vehicle. Computer algorithms combine these shapes to form a complete 3D picture of the world around the vehicle.
LiDAR has a range of 250 to 400 meters, enabling vehicles to accurately identify objects and their locations before reaching them. This allows the vehicle's computer to react accordingly, such as with automatic braking. There are two types of LiDAR: the first is Time-of-Flight (ToF) radar, which maps the surrounding environment by measuring emitted and reflected light pulses or photons. ToF typically has a 360-degree range, allowing a single device to perform this task. Located on the top of the vehicle, it is less practical and more expensive.
Another type of LiDAR, Frequency Modulated Continuous Wave (FMCW), emits a continuous stream of light instead of light pulses to map the surrounding environment. This type of LiDAR has a limited field of view, ranging from 90 to 120 degrees. Several fixed sensor units are required to achieve coverage comparable to a single ToF unit. It can be placed on the sides of the bumper, in the rearview mirror, on the roof, etc.
Currently, major suppliers of LiDAR include Argo AI (Ford, Volkswagen) and Luminar (Volvo). LiDAR has obvious advantages, but it also has disadvantages, namely, the high cost per unit. For example, if it is installed on both sides of the bumper, and there is a scratch or collision, the cost will not only be the cost of replacing the bumper. LiDAR is generally supplied by specific suppliers of the manufacturer and cannot be purchased and replaced on the market. Therefore, the cost of using it in the long run is high. This is something that needs to be known in advance when purchasing a car.
As the name suggests, lidar is an electronic device that uses laser beams instead of sound waves to detect, locate, track, image, and identify targets. Besides being used in automobiles, it is also widely applied in drones, autonomous robots, satellites, and rockets.
Advantages of lidar:
1. The wavelength of the light beam is shorter, and its anti-interference ability is stronger. It is basically not affected by external electromagnetic wave signals and substances.
2. The beam has better directionality and does not bend, so it can detect objects at a greater distance and over a wider range.
3. Higher precision: It can accurately identify objects as small as centimeters, even those hundreds of meters away. Therefore, it can capture objects, pedestrians, and even their movement speed and trajectory.
4. Faster frequency: The sensors return from the target quickly enough, allowing the in-vehicle computer to achieve real-time environmental perception and obstacle avoidance functions more quickly.
5. It can operate around the clock, and the detection effect will not be affected even when the light is poor at night.
