Demand analysis
• There is no public network signal in the cable tunnel, and the cost of arranging a fixed network system is high
• Complex environments such as metal doors and curves make it difficult to transmit real-time inspection video
• High voltage level, large electromagnetic interference, high real-time requirements
• The public network signal near the substation is poor, and the inspection video cannot be transmitted back through the public network
• Remote visual operations require a large amount of interactive data
Introduction of system advantages
Beifeng MESH wireless ad-hoc network system is a mobile broadband multimedia communication system designed with a new concept of "wireless mesh network"。The system adopts the distributed network architecture of no center AD hoc network, and all nodes can realize real-time interaction of multi-channel voice, data, image and other multimedia information under the condition of non-line-of-sight and random fast movement。Compared with the current network based on the central node, the main advantages of the centreless AD hoc network technology are:
l Multi-node Fast and flexible networking: Supports 32 nodes for rapid deployment and flexible networking。As the topology changes, the system automatically recalculates the routing relationship between multiple nodes and quickly generates a new routing table。
Strong anti-interference: ARQ transmission mechanism is adopted to improve the reliability of data transmission;With its own frequency sweep function, the frequency network that is less affected by interference is manually selected in the single frequency working mode。
Anti-disfigurement: When a node in the network fails, the forwarding task originally carried out by the node will be relayed through other nodes and automatically select the transmission path, and the whole network can still work normally。
l All-ip networking interconnection: The system adopts the all-IP data transparent transmission design concept, which is easy to interconnect with other systems, overcome the problem of poor signal of traditional public networks, reduce network construction costs, and facilitate inspection in cable tunnels or other closed buildings。
l Remote visualization operation: The system supports real-time multimedia transmission of voice, image, data and positioning information, and the device can cooperate with other devices to complete voice calls, video calls, data transmission and other functions. At the same time, the built-in WIFI module can be used to associate with external devices for real-time interaction。
Scheme application
When an emergency occurs, the emergency communication system needs to solve the problems such as congestion blocking caused by sudden traffic peak in the public network, base station damage caused by fire, earthquake, or terrorist attack, no signal coverage in remote areas, and communication security required when performing special tasks。According to the actual needs and application scenarios of emergency communication, Beifeng Communication combines new communication technology to create a MESH wireless AD hoc network system, and the overall design idea meets the particularity of emergency communication。
The system uses advanced AD hoc network technology，In the cable tunnel without network coverage, strong electromagnetic interference, space closed complex situation to achieve intelligent multi-hop relay, long distance high bandwidth, self-organization and self-healing，Send audio and video back in real time，And can simultaneously multi-party online consultation research and judgment，Public mixed network to open the last kilometer coverage，Truly realize intelligent inspection，Real-time online command and dispatch。
The system can be widely used in military, public security, armed police, fire protection, civil air defense, electric power, petroleum, transportation, water conservancy, forestry, radio and television, medical, water and air communications and other sectors，To provide users with reliable, timely, safe and efficient voice, data, video and visual command and scheduling and other rich integrated services，Truly achieve "anytime, anywhere on demand"。
