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1. Set up three fixed co-frequency network base stations to achieve full coverage of the sea area in the design plan and optical fiber network connection command center to form a mobile local area broadband network from the mobile front-end to the base station access command center.
2. Establish 3 mobile front-end devices, which can find suitable base stations and automatically access the network during the mobile process, enabling seamless roaming switching.
3. Set up a command center voice and video emergency dispatch system. The images collected by the wireless mobile front-end equipment are transmitted to the command center in real time. The video of the command center can also be transmitted to the mobile front-end in real time to realize two-way video, voice and data communication.
2. System scheme diagram 
3. Basic description of the project According to the needs of the construction party, adopt TDD wireless mobile emergency broadband communication system technology to perform full signal coverage on all sea areas in the sea area, and establish data and video bidirectional point-to-multipoint between the mobile front-end monitoring point and the base station. The same-frequency transmission link, working frequency band UHF, supports non-line-of-sight wireless transmission within 30 kilometers.
TDD wireless mobile emergency broadband communication system technology can be customized according to the actual field strength of the field. The wireless channel coding adopts TDD-OFDM modulation technology. The diffraction capability is strong. The same frequency point supports bidirectional transmission, saves spectrum resources, and can realize real-time network IP transparent transmission. , Meet two-way network control and audio and video surveillance.
In order to save the frequency resources as much as possible, multiple mobile front-ends can share one frequency point, and the center can switch the working/standby state of the monitoring point device and the corresponding base station in real time to implement round-robin monitoring of each mobile front-end.
Multi-base station networking and roaming instructions 
All VTECH wireless mobile emergency broadband communication devices have 8 frequency channels built in. Each channel frequency is configured with the same frequency and different frequencies as required. The uplink and downlink operating frequencies of the base station and the front-end device are the same, and there are 8 channel working settings, along with the base station. Change and change.
All VTECH wireless mobile emergency broadband communication front-end communication terminal work mode is to receive the control signal of the base station, and after the demodulation is normal, it establishes a communication handshake with the base station. Such as: Yangkou base station operating frequency f1, Lusigang base station operating frequency f2, round Tuojiao base station operating frequency f3. Front-end equipment A, in the Yangkou base station signal coverage, handshaking, when the A equipment to the mobile Lu Sigang After the base station moves for more than ten kilometers, it will not receive the signal of the Yangkou base station. The A equipment will automatically find the signal of the Lusigang base station, and will automatically shake hands after receiving the signal. Switching time is less than 3s.
We need to select locations and existing site conditions based on actual conditions, build base stations to cover the entire sea area, and implement video communication between maritime law enforcement ships and the center. Considering the limitation of frequency resources, we use the same frequency networking mode to fully cover the entire sea area. Each base station covers a radius of 25km or more. 
Base station topology 
Shipborne topology 
Maritime Building Command Center Topology 
1. Demand analysis In a daily work, a maritime bureau needs to supervise the ports, berths, navigation channels, anchorages, etc. in the key water areas under its jurisdiction in order to meet the customers' macro regulation of front-end sea patrol ships and emergency command vehicles in the course of law enforcement. The management will improve the automation and informationization level of the on-site surveillance image of the Maritime Safety Administration, and provide a remote visualization assistance management method for on-site supervision and command. Our company proposes a maritime coastal vessel traffic management system project proposal for the special application of the maritime sector. According to the existing resources, the following needs are analyzed: