With the continuous development of wireless technology, ordinary wireless technology, ordinary wireless bridges can no longer meet the needs of all customers, especially for some special industries and application places, ordinary wireless monitoring equipment can not be achieved. The birth of Mesh technology changed the bottleneck of wireless monitoring technology. Mesh network is a network combining mobile communication and computer network. It can quickly and timely solve communication problems in the area when the network communication facilities are damaged. Allow staff to calmly respond to emergencies. Mesh wireless ad hoc networks provide a reliable opportunity to solve the disadvantages of traditional network communication. Let ’s briefly introduce the application of Mesh wireless ad hoc network in the wireless monitoring industry:
1.Mesh wireless ad hoc network is used in the tunnel
With the continuous deepening of the tunnel excavation project, the environment inside the tunnel will undergo various changes, and a large number of excavating machines, transport vehicles and construction personnel will also increase the frequency of access due to the progress of the project, and the length and complexity of the interior of the tunnel The difficulty of wiring the monitoring system is increased, so using a wireless monitoring system in the tunnel is a better choice.
To this end, Lai An Technology has designed a set of wireless monitoring solutions dedicated to tunnel construction projects. Using this tunnel wireless monitoring system, the safety factor of tunnel construction projects can be effectively improved. Real-time monitoring helps to monitor the traffic conditions, the internal environment of the tunnel, lighting, and fire alarms after the tunnel is put into use.
The wireless ad hoc network communication system has the characteristics of automatic networking, automatic relay, fast network access, strong resistance to multipath interference, and low attenuation of multi-hop bandwidth. When vehicles or subways are driving in tunnels, multi-hop wireless ad hoc is used. Network communication system, the signal's propagation path can be reflected through the curved surface of the tunnel, and communication is connected across obstacles to prevent vehicles or urban rail communication networks in the tunnel from being blocked. The wireless ad hoc network solution is applicable to the ad hoc network communication of fleets in highway tunnels, and can also be applied to the vehicle-ground communication system in urban rail transit tunnels.
2.The use of Mesh wireless ad hoc networks in driving school exams
With the rapid development of wireless LAN technology based on spread spectrum technology, the bottleneck of transmission capacity has been broken, and the integrated application of wireless transmission of video, audio and data has been further developed. With the issuance of Decree 123 of the Ministry of Public Security in 2012, most driving schools across the country have begun to use electronic driving test systems, making the tests more fair and rigorous, while also putting forward higher requirements for intelligent driving test systems. The main difficulty of the driving test system is the mobile wireless video, voice, and data real-time backhaul system, which is characterized by high real-time data requirements, large data traffic, fast mobile terminals, increasing number of vehicles, and complicated road conditions.
After a year of R & D and application, Shenzhen Laian Technology Co., Ltd. has developed a mature wireless communication system for subject three. The entire system is stable and reliable and has been used in multiple driving school test rooms. Customers have consistently rated it as the best subject three in China. Dedicated communication system. The driving school MESH wireless ad hoc network system has high-end features such as high power, high bandwidth, easy installation and debugging, and full channels. The actual effective maximum bandwidth is up to 160M in both directions. The use of two omnidirectional antennas with a communication distance of more than 2 kilometers per base station It can access 20-30 driving test vehicles; it can be widely used for driving network data transmission of subject two, subject three, cruise ships, rail transit, railways, etc. It has online scanning, pre-connection, intelligent path learning functions, and can be used at high speeds. Provides high-bandwidth, no-latency data roaming services in mobile environments.
3. Mesh wireless ad hoc network wireless transmission in intelligent inspection of power tunnel robots
Traditional manual inspection methods have the disadvantages of high labor intensity, low work efficiency, scattered detection quality, and single means. The application of robots in the field of power inspection will become more and more popular. In fact, the various meter values, switch positions, and sensor signals in the power distribution room are dazzled. During the substation inspections, the weather is severe and cold, and the humid and high temperatures in the cable tunnels, toxic gases, and electromagnetic radiation can be handed over to the robots. .
In this project, the robot is mainly used in a tunnel with a depth of nearly 400 meters, which has a certain curved arc. The electric power inspector puts the robot into the tunnel at the tunnel entrance, and uses multiple surveillance cameras and sensors installed on the robot to transmit various data and video detected by the robot in the tunnel to the inspector's mobile terminal equipment at the tunnel entrance. At the same time, the inspector can also control the robot. The inspection robot conducts inspections in the tunnel. From the tunnel entrance to the tunnel terminal, the inspection robot does not need to turn around, and goes straight in and out. At the same time, the depth of the tunnel itself is not too far, and the curve amplitude is not large. The robot uses LA-5839A directional bridge transmission to focus the signal farther. LA-5839A has highly sensitive reception. Communication in the tunnel can obtain higher receiving sensitivity and link signal. It can fully meet the requirements for data transmission of the detection robot. Accessed from the tunnel entrance through data packets, the overall delay is about 2 milliseconds, and the robot's activities can be well grasped and controlled. Completely meet the requirements of the bidding party.
4. Mesh wireless ad hoc network wireless video surveillance in a digital grid mining area
China is rich in land and resources and rich in mineral resources. Many energy sources or non-ferrous minerals are increasingly mechanized. In order to ensure the safe mining of the mine and prevent accidents. At the current stage of intelligent development, how to use AI intelligent technology to effectively monitor the safe production of modern mines has become a management idea. Through the intelligent system, it realizes the visual management of the mining area staff, vehicles, and operation information.
The front end, the mine transportation vehicle and the loading and unloading truck are the forefront of the entire monitoring system. The working area of the loading and unloading truck is relatively fixed, and the transportation truck needs to work back and forth between the material loading area and the production base, and the route is not very fixed. In the system, monitoring cameras are installed on the loaders and transport vehicles to monitor the entire working process and operating conditions of the operators in real time. Then the signal is transmitted to the various data access base stations around the mining area through the vehicle mobile terminal equipment signal equipment.
The advantages of Mesh wireless ad hoc network are: simple and convenient to use, MESH configuration only needs to set the role to automatically configure the best parameters; intelligent networking, mobile wireless MESH uses a powerful kernel layer 2 network routing algorithm, which can minimize Time to obtain the best link; fast handover, mobile wireless MESH uses multiple base stations to automatically back up, mobile nodes will select the optimal speed base station according to the best link in time, the handover time can be ignored; high bandwidth, mobile wireless MESH single frequency can be the highest Up to 60M bandwidth, dual-band mode up to about 100M, the highest speed of MESH AP on the market; high stability, mobile wireless MESH professional mobile environment design with high adaptability, can be used in harsh environments such as vibration, high temperature, low temperature, humidity At the same time, the device has a wide voltage design suitable for most parts.