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Lidar is a radar system that uses laser beams to detect the position, speed, and other characteristics of targets. Its working principle involves using a laser as the signal source; the laser emits pulsed light that is scattered across the ground—onto trees, roads, bridges, and buildings—via the oscillating motion of a laser scanning mirror. A portion of this reflected light returns to the lidar receiver. By combining the laser's precise height measurements with its scanning angles, the system can accurately calculate the coordinates of each point on the ground. Continuous scanning of the target with pulsed lasers allows the system to capture data from every single point on the object. After image processing, these data are transformed into highly accurate, three-dimensional images.

Lidar is an advanced detection method that combines laser technology with modern optoelectronic detection techniques. In addition to being used for acquiring three-dimensional geographic information, it is also widely applied in fields such as resource exploration, urban planning, agricultural development, water conservancy projects, land-use management, environmental monitoring, transportation and communications, earthquake disaster prevention and mitigation, and autonomous driving. Lidar operates at frequencies far higher than microwaves, offering the following advantages:

(1) High Resolution

(2) Excellent stealth capability and strong resistance to active interference

Laser light travels in a straight line with excellent directivity and forms a remarkably narrow beam. It can only be detected along its precise path, making it highly resistant to interception by the other party. In nature, there are few sources capable of disrupting laser radar signals, which gives laser radar exceptional resistance to active interference.

(3) Excellent Low-Altitude Detection Performance

Due to the influence of various ground clutter echoes, microwave radar has certain blind spots at low altitudes. In contrast, with LiDAR, only the illuminated targets reflect light—there’s no interference from ground clutter at all—allowing it to operate at "zero altitude."

(4) Small in size, lightweight

Keywords: Security Monitoring

Security Monitoring

Lidar is a radar system that uses laser beams to detect the position, speed, and other characteristics of targets. Its working principle involves using a laser as the signal source; the laser emits pulsed light that is scattered across the ground—onto trees, roads, bridges, and buildings—via the oscillating motion of a laser scanning mirror. A portion of this reflected light returns to the lidar receiver. By combining the laser's precise height measurements with its scanning angles, the system can accurately calculate the coordinates of each point on the ground. Continuous scanning of the target with pulsed lasers allows the system to capture data from every single point on the object. After image processing, highly accurate 3D images of the target can be generated.

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LiDAR

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