PCB Blog - The Application of Millimeter Wave Radar

Principle of millimeter wave radar

Millimeter wave radar is a newly emerging technology for security. The principle is that electromagnetic waves are transmitted by the transmitter through the radar antenna, reflected by obstacles, and then received by the receiver. The position data of the target is measured according to the time difference between receiving and transmitting. In case of heavy rain, radar performance will be reduced and its monitoring range will be reduced. In a word, the above protection systems have advantages and disadvantages. No single system can solve all problems independently.

Advantages of millimeter wave radar

Market demand can promote technological development. In order to make up for the deficiencies of the above systems, millimeter wave radar has gradually entered the security field. With the development of technology and the decrease of component cost, it is no longer a problem for millimeter wave radar originally used in military field to be used for security.

The new millimeter wave security radar adopts FMCW technology to realize the full range coverage of the monitoring area without any interruption. It has the advantages of small size, light weight, high reliability, small distance blind area, no speed blind spot, high distance resolution, and good anti-interference performance. Compared with the infrared counter fire system, the security radar provides a continuous millimeter wave radar wall with a certain height and thickness, without the possibility of drilling and jumping. Compared with the cable-type system, the security radar can not only locate the intrusion target, but also obtain the speed, direction, distance and angle information of moving objects in the monitoring scene. It can monitor an empty space for 24 hours without gaps. With the high-speed PCB spherical camera with synchronous zoom laser fill light, target tracking can be realized. It can not only locate the intrusion point immediately, but also obtain good image information, which is convenient for security personnel to respond quickly, so as to avoid accidents.

The advantage of themillimeter wave radar is that a single radar can achieve 360 "area coverage, and any object with a certain surface area can be detected when entering the radar protection area. At present, the detection range of the millimeter wave radar can reach 3km, with obvious advantages. It can also divide defense zones freely to achieve the purpose of early warning. It is used for enterprise security systems with large sites, such as oil depots, oil fields and docks, with obvious advantages.

Application scenario of millimeter wave radar

1. Missile guidance: One of the main uses of millimeter wave radar is terminal guidance of tactical missiles. The millimeter waveguide seeker has the characteristics of small size, low voltage and all solid state, which can meet the requirements of a missile-borne environment. When the operating frequency is 35 GHz or 94 GHz, the antenna aperture is generally 10-20 cm. In addition, millimeter wave radar is also used for beam guidance systems as the control of short-range missiles.

2. Target monitoring and interception: millimeter wave radar is applicable to short-range, high-resolution target monitoring and target acquisition, and is used to monitor low-altitude flying targets, ground targets and outer space targets.

3. Artillery control and tracking: Millimeter wave radar can be used for artillery control and tracking of low-altitude targets. A 94 GHz monopulse tracking radar has been developed.

4. Radar measurement: High resolution and high-precision millimeter wave radar can be used to measure the characteristics of targets and clutter. This kind of radar generally has multiple operating frequencies, multiple receiving and transmitting polarization forms and variable signal waveforms. The radar cross section of the target is measured by frequency proportion method. Using millimeter wave radar, the radar target cross section at lower frequency can be obtained by measuring the scaled down target model. In addition, millimeter wave radar is also used in terrain tracking, missile fuze, marine navigation, etc.

Two Applications of Millimeter Wave Radar

1. Automobile

Because of its long distance, high reliability, and freedom from light and dust, the millimeter wave radar is far superior to the camera in that it is more than 150 meters away. Compared with the laser, the price of about 1000 yuan is also a big win. So it is still the mainstream technology.

Lidar is making great efforts in technical innovation to reduce the price. Due to the rapid popularization of technology and price, millimeter wave radars were originally only available in more than 500000 vehicles, but now they are slowly being installed in more than 100000 vehicles. In addition, Telsa, a leader of ADAS, has also started to recruit technical directors from automobile radar manufacturers and began to install them in its electric vehicles in September. It can be seen that the application of millimeter wave radar in automobiles is still the mainstream technology.

2. UAV

We often say that cars and drones are very similar to high-speed PCB movement, safety first application Scenarios of millimeter wave radar Analysis of millimeter wave radar technology and its application. High speed is necessary, and the detection distance is far enough. Security requires that the detection method be robust and less affected by the environment. Application Scenarios of Millimeter Wave Radar Analysis of millimeter wave radar technology and its application.