WIFI多级桥接应急多媒体通信系统研究

聚焦北京地铁交通轨道应急抢险可视化通信与信号传输的应用领域,针对传统的有线通信系统存在的传输距离短、线路铺设灵活性差;无线通信系统中,无线自组网技术存在的收发单元间传输能力与适应性差;卫星与公网结合的通信系统存在的信号源不稳定等缺陷。提出了WIFI多级桥接应急多媒体通信系统架构,研究基于5.8GHz的WIFI多级接桥技术并研制相关设备,在无线自组网技术基础上,在传输能力与适应性方面进行了改进,能够有效适应远距离、遮挡及垂直差异存在的信号传输场景。提出采用广泛应用的公网4G信号构建通信系统,有效避免当车载基站作为信号源时造成的不稳定性,当应急救援现场无4G信号覆盖时,结合WIFI多级桥接技术提供的网络传输保障功能,从而使得整体桥接与通信系统可满足所有的地铁抢险环境并实现相应功能要求。

Research on WIFI Multi-level Bridge Emergency Multimedia Communication System

Focusing on the application field of visual communication and signal transmission of Beijing subway traffic track emergency rescue, aiming at the shortcomings of traditional wired communication systems, such as short transmission distance and poor flexibility of line laying; for wireless communication systems, poor transmission capacity and adaptability between transceiver units exists in wireless ad hoc network technology, and the instability of signal sources in communication systems combining satellites and public networks. The WIFI multi-level bridging emergency multimedia communication system architecture is proposed. The WIFI multi-level bridge technology based on 5.8GHz is researched and related equipment is developed. Based on the wireless automatic network technology, it can effectively adapt to the signal transmission scenes of long distance, occlusion and vertical difference. It is proposed to use a widely used public network 4G signal to construct a communication system, which can effectively avoid the instability caused by the vehicular base station as a signal source. When the emergency rescue site does not have 4G signal coverage, combined with the network transmission guarantee function provided by WIFI multi-level bridging technology So that the overall bridging and communication system can meet all subway rescue environments and achieve the corresponding functional requirements.