With the development of society and the continuous improvement of people's living standards, people's awareness of safety precautions has gradually increased. The demand for security in smart homes, smart cities, factories, communication base stations, and near rail transit is increasing.
Traditional security equipment is video cameras, infrared, lasers, fiber optics, and leaked cables. Video is susceptible to environmental interference, false positives, and cannot work around the clock. Compared with traditional equipment, millimeter-wave radar has the advantages of small size, light weight, all-weather operation, easy deployment and installation, strong anti-interference ability, accurate positioning and tracking, and convenient networking of multiple radars.
Radar can quickly detect and accurately invade targets in the field of security, and provide timely alarms and warnings, which is an important technical equipment in the field of security. With the increasing degree of chip integration and powerful hardware performance, the advantages of low cost, light weight and small size of millimeter-wave radar are more obvious compared with other security sensors.
As a non-contact sensing technology, millimeter-wave radar can be used to detect objects and provide information on the distance, velocity, and angle of objects. It operates in a spectrum range of 5GHz to 300GHz, has a smaller wavelength, and is capable of penetrating specific materials such as plastics, wall panels, and clothing, and is immune to environmental conditions such as rain, fog, dust, and snow.
The wavelength of millimeter-wave radar is in the wavelength range where microwave and far infrared waves overlap, so it has the advantages of microwave guidance and photoelectric guidance, and also has its own unique properties.
According to the propagation theory of waves, the higher the frequency, the shorter the wavelength, and the higher the resolution, but the greater the loss in the propagation process, the shorter the transmission distance. In contrast, the lower the frequency, the longer the wavelength, the stronger the diffraction ability, and the longer the transmission distance. Therefore, compared with microwaves, millimeter waves have high resolution, good directivity and good detection performance.
Compared with infrared, millimeter wave atmospheric attenuation is reduced, has better penetration to smoke and dust, and is less affected by weather. These characteristics determine that millimeter-wave radar has the ability to work all day and all day.
Millimeter-wave radar measures the position data and relative distance of the target according to the time difference between transmission and reception by transmitting signals outward and receiving target reflection signals, calculates the relative speed, and tracks and identifies targets according to the detection object information.
The performance indicators of millimeter-wave radar usually include detection distance, resolution, etc., and the quality of these indicators is determined by the antenna, radio frequency, baseband and control processing parts inside the millimeter-wave radar. Among them, the technical difficulty of RF is high, and the MMIC chip and antenna PCB board of millimeter-wave radar RF are the hardware core of millimeter-wave radar.
The performance of PCB antennas is critical for these radar systems, which need to emit to the target and receive reflected signals almost instantaneously. Key microstrip antenna performance parameters include gain, directivity, and efficiency, and low-loss circuit materials are essential for obtaining good PCB antenna performance.
The long-term reliability of PCB antennas is also very important, as these compact antennas and their high-frequency transceiver circuits must also work continuously and reliably in more challenging operating environments.
Millimeter-wave radar acts on security, and 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 location data of the target is measured according to the time difference between sending and receiving.
Millimeter-wave security radar adopts FMCW technology, which realizes the full coverage of the space in the monitoring area without any interruption, and has the advantages of small size, light weight, high reliability, small distance blind spot, no speed blind spot, high distance resolution, and good anti-interference performance.
Security radar is a new technical means emerging in the security market, Feirui Technology provides radar sensing technology modules, combined with PTZ high-definition digital monitoring, high-end perimeter security demand market to provide more efficient solutions.
Millimeter-wave radar is indispensable. With the upgrading of human technology, various parts will undergo various revolutions and improvements, but the form of radar will not disappear, and the capabilities and needs of this sensor will not disappear.