"The new underground emergency communications equipment" is a major achievement Shenyang Fire Research Institute of Ministry of Public Security of the Ministry of Public Security to assume complete technical research projects, "the underground construction emergency communications technology research and equipment development" made the project acceptance by experts in August 2017. 
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The result is a technical equipment for solving live video transmission in underground multi-layer complex building environment, which is mainly composed of four parts: single soldier acquisition and transmission terminal, multi-carrier fusion relay, MESH relay and command display terminal, and adopts multi-carrier and Self-organizing network convergence communication technology enhances the vertical networking capability and horizontal coverage of wireless signals in underground complex building environments. The visual link monitoring technology is used to solve the problem of optimizing the location of the deployment site of the networking equipment, and the underground building is realized. The video transmission in the environment of fire fighting and rescue is reliable, and has the characteristics of good protection performance, high communication stability, and practical use and operation. It can provide effective technical means for the firefighting forces to carry out underground communication.
The multi-carrier communication frequency band of the result is 520MHz, the self-organizing network communication frequency band adopts 580MHz, the radio frequency output power is 1W, the transmission delay is less than 100Ms, and the standard definition and high-definition data interface are provided. The results have been measured in complex scenes such as large underground parking lots, commercial plazas and tunnels, and the application effect is good.
Emergency communication equipment physical map
System composition topology
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