Millimeter-wave radar module track tracking personnel monitoring and privacy protection. At present, personnel monitoring has become an important field of exploration because of its requirements for the number, orientation, movement, and health of target personnel. Among them, the accuracy and environmental adaptability of personnel monitoring equipment play a key role. Although the application of sensor technologies such as optical cameras, passive infrared (PIR), active infrared, etc. is relatively common at present, the accuracy, false detection rate, environmental adaptability (such as illumination, brightness, smoke and object occlusion, etc.) and privacy protection are relatively common. still restricted.
mmWave radar module personnel monitoring can accurately measure the target distance, speed and angle, distinguish between people and non-human objects; there are no restrictions on environmental conditions such as rain, dust or smoke; it can work continuously in complete darkness at night or in bright daytime; it works on the target There are also unique advantages in terms of personnel privacy protection and installation. Compared with laser equipment, it has the propagation characteristics and environmental adaptability of penetrating smoke, dust, rain, fog and snow; compared with optical technology equipment such as cameras, it has good privacy protection and installation concealment, which makes up for it to a certain extent. the shortcomings of these applications. Millimeter wave personnel monitoring radar has obvious advantages in target personnel counting and tracking.
1. Trajectory tracking and personnel counting of the millimeter wave radar module
People counting and trajectory tracking are indispensable data for people flow statistics and regional security, such as airports, shopping malls, chain stores, stations, museums, conference rooms, etc. The millimeter wave radar module can obtain the current speed, position and direction of the target person by calculating and analyzing the electromagnetic waves reflected by the moving target person in the monitoring area, and output the speed, tracking position and direction of the target person. In addition, by analyzing the location of the target person, it can be judged whether the target person has entered the set monitoring area, and the number of targets monitored in each area can be counted and output.
Target counting and tracking steps:
1. Draw and set the monitoring area and count tripwires;
2. The radar transmits electromagnetic wave signals to the monitoring area, and then receives the reflected signals;
3. Count the number of targets entering and leaving the monitoring area and passing the counting tripwire;
4. Obtain location information and track moving targets reflecting electromagnetic wave signals in the monitoring area;
5. Constantly refresh the target number and trajectory information of the monitoring area.
2. Application advantages of personnel monitoring radar
Personnel monitoring radar is based on millimeter wave radar with narrow beam, wide frequency band, high resolution, strong anti-jamming ability, target feature extraction, classification and identification, good concealment, small size and light weight.
1. Narrow beam
The narrow beam of millimeter wave radar has high tracking and guidance accuracy; low elevation angle tracking is convenient, anti-ground multipath and clutter interference; high lateral resolution of near-air targets; high resolution for regional imaging and target monitoring; high anti-jamming performance; high Antenna gain; small target detection is convenient.
2. Broadband
Millimeter-wave radar adopts narrow pulse or wideband FM signal, which can easily obtain the detailed structural characteristics of the target; the wide spread spectrum capability can reduce multipath and clutter, and enhance the anti-interference ability; high range resolution, the ability to accurately track and identify the target.
3. High transmit frequency
The high transmission frequency of the millimeter wave radar module has good detection and identification capabilities for slow targets and vibrating targets, and it is easy to use the target Doppler frequency characteristics to identify target characteristics; it can penetrate dry air pollution and dust, in smoke, rain and snow conditions. It has good detection ability.
4. False alarm elimination
Millimeter-wave-based chirp radar, personnel monitoring radar FMCW, MIMO, DBF use static object elimination algorithm and other technologies, which can eliminate static objects (such as walls), tables and chairs, etc. The algorithm for distinguishing between people and non-characters can distinguish between people and micro-animals (such as rotating electric fans), fluttering curtains, micro-moving green belts, etc. The multi-path interference cancellation algorithm can eliminate false detection points caused by target movement; the multi-target tracking algorithm of the millimeter wave radar module can accurately locate and stably track multiple moving targets. The comprehensive application of these technologies and algorithms can effectively distinguish people and other objects, eliminate false detections, and help achieve indoor detection. Accurate counting and stable tracking of multiple targets in outdoor environments.
5. Protect privacy
In very privacy-conscious applications such as bedrooms, bathrooms, dressing rooms, gyms… where most people are more sensitive to the use of optical cameras or other optical technology solutions. Millimeter wave personnel surveillance radar uses radio frequency signals and does not involve personal privacy, which means that personnel surveillance radar does not provide or disclose any personally identifiable information.
6. Install concealed
Objects in the environment, such as leaves and opaque glass, can block the "line of sight" of optical technology-based devices and ultimately limit the installation, layout and use of these devices. Millimeter-wave personnel surveillance radar RF signals can penetrate different types of materials such as plywood, thin wood, plastic, opaque glass, etc., allowing users to choose unique installation locations to avoid system damage or maintain a clean appearance.
3. Personnel monitoring and installation of millimeter wave radar module
The millimeter wave radar module is generally installed on the wall, the installation height is 3m, the coverage distance is 0.1m~10m, and the radar horizontal beam angle is 120°. It is suitable for people counting, occupancy detection, automatic doors, lighting control, sports monitoring, etc. in public open areas such as shopping malls, hospitals, office areas, conference rooms, underground garages, corridors, and private places such as bathrooms, gyms, and bedrooms.
