What is the difference between ordinary radar and lidar?

In recent years, radar and lidar technologies have gained huge market demand in various fields. With the advancement of technology, the impact on the perimeter surveillance field has also been very obvious. In this field, these two technologies are used as perimeter detection The viable alternatives and enhancements have developed rapidly. By comparison, what is the difference between these two radars?

1.Lidar

Lidar has actually existed a long time ago, but it is not well known to the public. It was not until the rise of robotics and driverless industries that Lidar gradually entered people's field of vision. It is also widely used in AR / VR, intelligent transportation, ocean exploration, 3D printing and other fields.

Lidar is a sensor that can accurately obtain the two-dimensional and three-dimensional position information of a target object. Like a human eye, it is composed of a transmitting system, a receiving system, and information processing. Mainly by sending a detection signal (laser beam) to the target, and then comparing the received signal (target echo) received from the target with the transmitted signal, and after proper processing, the relevant information of the target can be obtained, such as Target distance, bearing, altitude, speed, attitude, shape and other parameters, so as to detect, track and identify the target.

2. Ordinary radar

Ordinary radar first appeared during World War II. Due to air combat needs, radar could help search for enemy aircraft in the air, so radar was widely used during World War II. It mainly uses radio detection and ranging to detect targets using electromagnetic waves, emits electromagnetic waves to irradiate targets and receive their echoes, and thus can obtain related information such as the distance from electromagnetic waves to targets.

3. Ordinary radar and lidar

Compared with lidar, ordinary radar has many deficiencies. Because radar relies on transmitting and receiving radio waves for tracking, there is a certain dead zone, and the signals sent out are easy to detect. And radio waves are susceptible to interference, and there are many unavoidable weaknesses and uncertainties, such as converting the propagated medium to other media may reduce some of the shortcomings.

With the higher resolution and longer detection distance, lidar is widely used in military, marine detection, and meteorological detection in addition to applications in robots, unmanned driving and other popular areas. Beam to detect the position of the target, to detect, identify and track targets such as aircraft and navigation.

Unlike ordinary radars, lidars have many advantages, not only can highly accurately locate the spot of a laser beam on an object. Moreover, it can improve the vulnerability of ordinary radars that are easy to detect and interfere with to a certain extent. Because the laser's propagation path is straight and the beam is very narrow, it can only be received on the propagation path, because it is very difficult to intercept the lidar signal. At the same time, there are many signals and materials that interfere with electromagnetic waves in nature. This is why ordinary radars are easily interfered by the outside world. Unlike lasers, there are few signals that interfere with lasers in nature. Therefore, lidars have strong anti-interference ability .

In general, the advantages of lidar over ordinary radar are more obvious. In addition to strong anti-interference ability and strong concealment, compared with ordinary radar, lidar is also more compact and lighter.