【摘要】 根据自动售货机和GPRS无线网络的特点,设计了一套基于GPRS无线传输技术的自动售货监控系统。售货终端通过简化的协议与监控中心建立联系,定时将数据上传至监控中心,便于统计分析;为了应对通信过程中可能出现的突发性持续干扰、提高纠错性能,在数据传输中采用了扩展海明码对数据进行交错编码,实践证明,这种方式不但提高了通信的安全性而且具有明显的抗干扰纠错功能;本监控系统适用于干扰大、信号不稳定的通信环境。更多还原

【Abstract】 This paper designs a set of sale automatic monitoring system based on GPRS wireless transmission technology.vending terminal set relation with monitoring center through the protocol,and upload data in time in order to facilitate the statistical analysis.In response to the sudden sustained interference in communication process,and to improve error correction ability,we use the extended Hamming code to interleaving code of data in data transmission.Practice has proved that this approach not only improves the security of communications but also has obvious anti-interference and error correction function.The monitoring system is suitable for communications environment that has strong interference and instability of signal.更多还原