In the current era of rapid technological development, smart home products are emerging in an endless stream. As the first line of defense for home security, smart door locks are gradually entering thousands of households. From the traditional key unlocking to password and fingerprint unlocking, and now to face recognition and sensing unlocking, the unlocking methods of smart door locks are becoming increasingly diverse. Among them, the application of the radar sensing module has brought new experiences and changes to smart door locks.
Analysis of the Working Principle of the Radar Sensing Module
The radar sensing module is mainly based on microwave technology. Taking the common 5.8GHz microwave radar as an example, it perceives the surrounding environment by transmitting microwave signals of a specific frequency and receiving the reflected signals. When an object moves within its sensing range, according to the Doppler effect, the frequency of the reflected wave will change. For example, when a human body approaches the radar sensing module, the frequency of the reflected wave increases; when it moves away, the frequency decreases. After the receiver inside the module captures these weak reflected signals, it will first amplify them through a low-noise amplifier, and then remove the noise and irrelevant signals through a filter circuit. Subsequently, it uses complex algorithms to analyze the frequency of the amplified and filtered signals, so as to accurately determine the presence, motion state, and motion direction of the object. For example, the 24G ultra-low power consumption radar of Feirui Intelligence adopts advanced millimeter-wave sensor technology and combines with proprietary radar signal processing algorithms to accurately sense human movement, slight movement, and even the stationary state.
The Remarkable Advantages of the Radar Sensing Module in Smart Door Locks
High Sensitivity and Precise Detection
The radar sensing module can keenly capture the subtle movements of the human body approaching. Compared with traditional infrared sensing and other methods, it not only responds quickly to a moving human body but also can accurately identify a human body in a stationary or slightly moving state. In the application of smart door locks, this means that users do not need to deliberately make large movements to trigger the door lock's response. As long as they enter a reasonable sensing range, the door lock can quickly sense the user's presence, greatly improving the convenience of unlocking. Taking the rd-03 millimeter-wave radar module of Anxinke Technology as an example, it detects human targets in the set space through FMCW (Frequency Modulated Continuous Wave) and combines with an accurate human body sensing algorithm to achieve high-sensitivity human presence state sensing, avoiding false detections of other objects. It will only accurately detect and make corresponding intelligent responses when a human body approaches.
Strong Environmental Adaptability
Whether it is the high temperature in summer or the low temperature in winter, a humid environment or a place with frequent light changes, the radar sensing module can work stably. It is not interfered by factors such as environmental temperature, humidity, brightness, and light fluctuations, which is an advantage that many other sensing technologies cannot match. In the actual use of smart door locks, whether in the humid plum rain season in the south or the cold winter in the north, the radar sensing module can always maintain good performance, ensuring the normal operation of the door lock and not causing misjudgment or failure due to environmental changes.
Concealment and Aesthetics
The radar sensing module can work hidden inside the shell of the smart door lock without the need to open holes on the surface of the product. This not only improves the overall aesthetics of the door lock but also effectively prevents dust and water vapor from entering due to the holes, affecting the stability of the internal circuit of the door lock and extending the service life of the door lock. For example, the vrm1122x-a microwave radar module of Huineng Sensing adopts fixed-frequency, directional transmitting and receiving antennas, integrates functions such as intermediate frequency demodulation, signal amplification, and digital processing, and can penetrate non-metallic materials such as glass, ceramics, and acrylic, making it very suitable for embedded concealed installation.
Low Power Consumption Design
For devices like smart door locks that rely on battery power, power consumption is a key indicator. The radar sensing module achieves low power consumption operation through optimized design. In the non-use state, the module can automatically enter the low power consumption mode, greatly reducing power consumption and extending the battery replacement cycle, bringing more convenience to users. For example, the 24G radar module of Feirui Intelligence supports the constant power supply mode and the adjustable duty cycle low power consumption mode. While ensuring high-efficiency sensing performance, it helps to extend the service life of the door lock, which is more environmentally friendly and economical.
Application Scenarios of the Radar Sensing Module in Smart Door Locks
Automatic Wake-up and Unlocking
When users are carrying items and their hands are not free, or it is difficult to accurately find the operation area of the door lock in the dark at night, the advantages of the radar sensing module are fully demonstrated. Users only need to approach the smart door lock. Once the sensing module detects the approach of the human body, it will quickly wake up the door lock system and automatically trigger the unlocking process. There is no need for manual touch or operation, achieving truly contactless and convenient unlocking, bringing a more relaxed and efficient door entry experience to users.
Smart Linkage
The radar sensing module can achieve smart linkage with other devices in the smart home system. For example, when users unlock the smart door lock through radar sensing and enter the house, the door lock system can send a signal to the smart lighting devices at home to automatically turn on the lights; at the same time, it can also link with the smart curtains to automatically open the curtains; or trigger the smart air conditioner to adjust the indoor temperature, etc., creating a comfortable and convenient home environment for users. From the moment they step into the house, users can feel the attentive service brought by the smart home.
Security Early Warning
In terms of security, the radar sensing module also plays an important role. When a stranger lingers near the smart door lock and the radar sensing module detects abnormal human activities, it can promptly send an alarm message to the user's mobile phone to remind the user to pay attention to home security; at the same time, it can also link with the cameras at home to conduct real-time monitoring and recording of the abnormal area, providing all-round protection for home security.
As one of the core technologies of smart door locks, the radar sensing module injects new vitality into the development of smart door locks with its unique advantages, greatly improving the security, convenience, and intelligence level of smart door locks. It is believed that in the future, with the continuous innovation and improvement of technology, the radar sensing module will play an even more important role in the field of smart door locks, bringing more surprises and conveniences to people's lives.
