桥梁是现代化交通的重要组成部分，对国民经济的发展起着积极的推动作用，为了保障桥梁的正常运行，必须对桥梁的健康状态进行定期检测。目前国内桥梁健康状态的检测主要采用有线方式，存在布线繁琐、费时长等缺点。无线通信技术的发展，使采用无线方式成为可能，但通信距离受到限制。所以研究既能延长无线通信距离，又能方便进行数据的接收处理是桥梁无线检测系统的关键技术之一。 通过对常见的短距离无线通信技术在通信距离、频率资源、传输速率、功耗等方面的分析比较，并结合桥梁检测项目的具体功能需求，研究了一种基于ZigBee和WiFi技术的中继转换系统，来实现检测信息的无线传输。转换器的设计基于ARM的硬件平台、嵌入式Linux软件平台和ZigBee、WiFi技术，软硬件具体设计过程，包括：基于ARM9的三星S3C2440核心处理器选择、无线模块的选择和各主要接口电路的设计；嵌入式Linux操作系统软件平台的定制和移植；Embedded Visual C++集成开发环境下应用软件开发设计。针对设计过程中可能遇到的子信道干扰，运用相关的技术和应用软件设计，给出具体的解决方案。 为验证所设计的转换器的有效通信距离，对其进行实际测试。测试结果表明，桥梁无线检测系统ZigBee-WiFi转换器实现了健康状况信息的接收与存储转发，最后提出了系统设计的不足与需要改进的问题。

The bridge is an important part of modern transportation, it plays a positive role in promoting the development of the national economy. In order to protect the normal operation of the bridge,we must carry out it’s health monitoring regularly. At present, the monitoring of bridge health status in our country is mainly wired, there are many defects in tedious wiring, long time consuming and so on. With the development of wireless communication technology, the use of wireless becomes possible, but the communication distance is limited. Therefore, the research，not only extending the wireless communication distance , but also processing facilitately the reception data, is one of key technologies in bridge wireless detection system. By comparing with the common short-range wireless communication technology in the aspects of distance, frequency resources, transfer rate, power consumption, and so on, it researches a relay switching system based on ZigBee and WiFi technology in order to realize wireless transmission of monitoring information according to detailed functional requirements of the project. The converter is based on ARM hardware platform, embedded Linux software platform and ZigBee and WiFi technology, software realization process in details includes choice of S3C2440 microprocessor Samsung produced based on ARM9, Wireless Module and design of main Interface circuit . It involves Custom and Transplantation of embedded Linux software platform, application software development based on Embedded Visual C++ integrated development environment. By useing related technology and application software design,it gives a specific solution for the problems of sub-channel interference and channel competitive conflict in multi-point to one-point communication in the design process. In order to verify the effective communication distance and data transmission rate of designed converter, we have real test. The results show that the wireless bridge monitoring system ZigBee-WiFi converter can receive health status information，store and transmits. At the end of this paper, it proposes the lack of system design and problems need to be improved .