With the popularization and promotion of autonomous driving, 3D printing, and service robots, the laser pointer radar has repeatedly appeared in people's sights.
There are so many different types of lidar lidars, and there are not many people who really understand it. Today we start with a car-mounted laser radar that is closely related to autonomous driving, to get a brief look at what is special about it.
The vehicle laser pointer radar, also known as the vehicle 3D laser scanner, is a mobile 3D laser scanning system and is one of the most effective tools for urban modeling.
In-vehicle laser radar, also known as in-vehicle 3D laser scanner, is a mobile 3D laser scanning system. The laser has a fast propagation speed and a good linearity. The on-board laser radar uses its characteristics to continuously transmit a detection signal (laser beam) to the surrounding target through a laser pointer, and receive the returned signal (target echo) to calculate and describe the measured physical. Information about the purpose of achieving dynamic 3D scanning. Therefore, the more Lidar harnesses, the denser the line of sight, the higher the accuracy, resolution, and security of the measurements.
On-board lidars commonly use multiple laser pointer transmitters and receivers to create 3D point cloud maps. In the current market, mechanical multi-beam laser radar is the mainstream solution for automotive laser radar. It mainly has 4 lines/8 lines/16 lines/32 lines, and also has the highest level of 64 lines and 128 lines, but so far only Velodyne is still global. A unique one.
Even with the 4-line laser radar, the advantages are obvious compared to other automotive sensor recognition technologies (standard vehicle radar and millimeter wave radar):
High resolution: laser pointer radar works in optical band (special band), frequency is more than 2-3 orders of magnitude higher than microwave, and can track multiple targets at the same time. Therefore, laser radar has extremely high range resolution and angular resolution. And speed resolution, which means it can detect smaller objects and distinguish them as pedestrians, vehicles or garbage dumps, which is the most significant advantage of lidar.
Strong anti-interference ability: laser pointer belongs to linear propagation, good directivity, very narrow speed of light, and can only be received on its propagation path, so the interference signal is difficult to enter the receiver of the laser radar. In addition, for laser radar, Only the illuminated target will produce reflections, which will not be affected by the ground echoes. Therefore, low-altitude/ultra-low-altitude targets can be detected, and the detection is much higher than microwave radar.