With the rapid development of smart home technology, radar ranging human presence sensor has become an indispensable part of smart home system. Among the many technical specifications, the 5.8GHz and 24GHz radar sensors have received much attention due to their unique performance. From the perspective of smart home, this paper will deeply analyze the difference between 5.8GHz and 24GHz radar ranging human presence sensors, and discuss its application in the field of smart home.
I. Overview of technical principles
Radar ranging human presence sensors detect the presence of target objects by transmitting electromagnetic waves and receiving their reflected signals. 5.8GHz and 24GHz as two different frequencies of electromagnetic waves, they have differences in wavelength, penetration, resolution, etc., which determines their different characteristics in smart home applications.
Second, frequency and wavelength difference
5.8GHz radar sensor
The 5.8GHz radar sensor operates in a lower frequency range with a relatively long wavelength. This characteristic makes the 5.8GHz radar sensor have strong penetration ability in smart home applications, which can penetrate obstacles such as furniture and curtains to achieve remote detection of the presence of the human body. At the same time, due to the long wavelength, the resolution of the 5.8GHz radar sensor is relatively low, but in the open outdoor and open public areas, its detection range is wider, and it is more suitable for long-distance and high-altitude mobile sensing application scenarios.
24GHz radar sensor
Radar sensors at 24GHz operate in a higher frequency range with relatively short wavelengths. This feature enables 24GHz radar sensors to have higher resolution and accuracy in smart home applications, enabling more accurate detection of the presence of the human body and its subtle movements. However, due to the short wavelength, the penetration ability of 24GHz radar sensor is relatively weak, which is more suitable for low-altitude motion sensing and human precise presence detection application scenarios.
3. Comparison of application scenarios
Application of 5.8GHz radar sensor in smart home
(1) Outdoor and public area monitoring: The 5.8GHz radar sensor is very suitable for outdoor and public area monitoring because of its long detection range and strong penetration. For example, 5.8GHz radar sensors in open places such as parks and squares can achieve real-time monitoring and statistics of the flow of people.
(2) Smart home security system: In the smart home security system, 5.8GHz radar sensors can be installed in doors, Windows, corridors and other locations for detecting the movement and presence of the human body. When someone breaks in, the sensor will immediately trigger the alarm system to ensure the safety of the home.
(3) Intelligent lighting system: In the intelligent lighting system, the 5.8GHz radar sensor can automatically adjust the brightness and switching state of the light according to the movement and presence of the human body. For example, 5.8GHz radar sensors are set up in corridors, stairs and other areas, which can achieve intelligent control of people to light up and people to walk off the light.
Application of 24GHz radar sensor in smart home
(1) Human body sensing in bedroom and study: 24GHz radar sensor is very suitable for human body presence detection in bedroom, study and other private scenes due to its high resolution and accuracy. By accurately sensing the body's breathing, sitting and other subtle movements, you can achieve more intelligent home control. For example, the 24GHz radar sensor in the bedroom can automatically adjust the air conditioning temperature and light brightness according to the sleep state of the human body.
(2) Smart home appliance control: In terms of smart home appliance control, 24GHz radar sensors can achieve more accurate human presence sensing and micromotion detection. For example, 24GHz radar sensors installed on home appliances such as smart refrigerators and smart washing machines can automatically turn on or off the devices according to the approach and departure of the human body, improving the ease of use and energy saving.
(3) Life safety protection: In terms of life safety protection, 24GHz radar sensors can achieve real-time monitoring and early warning of the human body. For example, 24GHz radar sensors in the bedrooms of the elderly or children can monitor their vital signs such as sleep status and breathing in real time, and once abnormalities are found, alarms can be issued in time and corresponding measures can be taken.
Fourth, performance and cost considerations
In addition to considering its technical principles and application scenarios, it is also necessary to consider its performance and cost. Although the 5.8GHz radar sensor has lower power consumption and moderate cost, it is slightly inferior to the 24GHz radar sensor in terms of resolution and accuracy. Although the 24GHz radar sensor has higher resolution and accuracy, it has higher power consumption and relatively high cost. Therefore, the choice needs to be balanced according to the specific needs and budget.
V. Summary and outlook
In summary, 5.8GHz and 24GHz radar ranging body presence sensors have their advantages and disadvantages in smart home applications. The 5.8GHz radar sensor is suitable for outdoor and public area monitoring, smart home security systems and smart lighting systems. The 24GHz radar sensor is more suitable for bedroom and study human body sensing, smart home appliance control and life safety protection scenarios. With the continuous development and popularization of smart home technology, it is believed that these two radar sensors will play a more important role in the future. At the same time, we also look forward to the emergence of more high-performance, low-cost radar sensor technology to inject new vitality into the development of smart homes.
