Four Common Technical Methods For Wireless Surveillance Cameras

- Dec 12, 2018-

Wireless monitoring technology is becoming more and more mature, and wireless monitoring applications are becoming more and more popular. What types of wireless monitoring are there?



In the wireless monitoring system, the wireless monitoring equipment is in the following four categories: 3G wireless monitoring equipment, 4G wireless video transmission equipment, microwave wireless monitoring equipment, WIFI wireless monitoring equipment. At present, these kinds of devices are familiar to everyone. Wireless signals can be seen everywhere in our lives. So what are their applications in wireless monitoring systems? What is the difference between them? Let's briefly introduce them:


1, 3G wireless monitoring equipment


3G wireless monitoring is an easy-to-use small remote wireless monitoring system that uses the latest 3G communication technology to meet the needs of home, small business or industry-specific user monitoring applications. It is designed to be easy to install, flexible and cost-effective. High 3G mobile video surveillance equipment.


The advantage of 3G wireless monitoring equipment is: the initial investment is very low, and it is very convenient to install and use. As long as there is coverage of 3G signal, the device can transmit signals when the device is turned on.


The disadvantage of 3G wireless monitoring equipment is that it is relatively expensive in the later period and is not suitable for long-term 24-hour monitoring. At present, the transmission of the signal to the image is still not smooth, and the quality of the transmitted image is not high enough to meet the requirements of high-definition transmission.


2, 4G wireless video transmission equipment


4G is the abbreviation of the fourth generation mobile communication technology. China Mobile 4G adopts TD-LTE in the 4G LTE standard. The theoretical peak transmission rate of the TD-LTE demo network can reach 100 Mbps downstream and 50 Mbps upstream. TD-LTE is a 4G network standard led by China. It has mature technology and has the conditions for large-scale promotion. It is now officially commercialized.


The 4G wireless video transmission device is a communication technology formed after the 3G wireless monitoring device. It integrates 3G and WLAN, and can quickly transmit data, high quality, audio, video and images.


The advantage of 4G wireless video transmission equipment is that 4G wireless video transmission rate is high, and it can transmit video images with high quality, which can provide a more stable and adjusted wireless mobile network. The initial investment is very low, and it is very convenient to install and use. As long as there is 4G signal coverage, the device can transmit signals when the device is turned on. The shortcoming of 4G wireless monitoring equipment is that the communication cost is relatively large in the later stage, which is not suitable for long-term 24-hour monitoring.


3. Microwave wireless monitoring equipment


Microwave wireless monitoring equipment is currently the mainstream product on the market. The wireless monitoring equipment is the perfect combination of microwave transmission technology and wireless monitoring technology. Microwave wireless monitoring can be divided into analog microwave and digital microwave.


Analog microwave transmission is to directly modulate the video signal on the channel of the microwave (microwave transmitter), and transmit it through the antenna. The monitoring center receives the microwave signal through the antenna, and then demodulates the original video signal through the microwave receiver. The image of this monitoring mode is very clear, no delay, no compression loss, low cost, simple construction and installation, suitable for general monitoring points, and need to be used without relaying.


Digital microwave transmission, that is, wireless bridge, first compresses the video code, then modulates it through the digital microwave channel, and then transmits it through the antenna. The receiving end is reversed, the antenna receives the signal, the microwave despreads, the video decompresses, and the analog video signal is restored. The microwave decoding solution can also be installed through the computer to install the corresponding decoding software, using computer software to decompress the video, and the computer also supports video, playback, management, PTZ control, alarm control and other functions; this monitoring method is more complicated, need to add There are many relays, and the monitoring points are concentrated. It can transmit multiple channels of video in a centralized manner. The anti-interference ability is better than the analog one. It has the advantages of being suitable for monitoring points and requiring more relays.


The advantages of microwave wireless monitoring equipment: low investment cost, long transmission distance, very good anti-interference, clear and smooth transmission image, suitable for transmission in various harsh environments.


Disadvantages of microwave wireless monitoring equipment: high environmental requirements, must be transmitted in an open environment, the diffraction ability is very poor.


4, WIFI wireless monitoring equipment


The official name of WIFI (Wireless Fidelity) is "IEEE802.11b". Like Bluetooth, it belongs to short-range wireless technology used in offices and homes. Although in terms of data security, this technology is worse than Bluetooth technology, but it is slightly better in terms of coverage of radio waves. The coverage of WIFI can reach about 300 feet (about 90 meters), and the office can be used in a smaller building, not to mention the office.


The WIFI frequency band is a free frequency band that does not require any telecom operation license worldwide, so the WLAN wireless device provides a wireless air interface that can be used worldwide, which is extremely inexpensive and has a very high data bandwidth.


Advantages of WIFI wireless devices: The investment cost is very low, the installation and use are very convenient, and the network can be built without professionals.


Disadvantages of WIFI wireless monitoring equipment: The transmission distance is close, and only the indoor transmission signal can be transmitted at a short distance, and the diffractive ability is also very poor. When the signal is transmitted, the obstruction is avoided as much as possible.


  to sum up:


Wireless monitoring applications are widely used, such as elevator monitoring and construction site monitoring.


The cost of wireless monitoring construction is greatly reduced. Small projects can consider the development trend of wireless monitoring and monitoring.