機车无线数据传输论文可用于机车无线数据传输的扩频模块研究.docVIP

机车无线数据传输论文：可用于机车无线数据传输的扩频模块研究 【中文摘要】扩频通信技术以其抗多径干扰能力强和截获率低等显著优势广泛应用于军事通信领域。随着第三代移动通信技术的发展,扩频通信技术越来越多的应用于民用通信中。我国铁路沿线,尤其是西南山区多弯道、多隧道、多高山的地理环境特点使得无线通讯的信道非常恶劣,各种突发干扰对数据的无线传输可靠性都会造成影响,从而对机车的安全运行造成影响。目前我国机车无线数字通信中应用较多的是450MHz数传电台,经试验表明,该电台在隧道传输时会出现信号中断,且抗同频干扰能力较弱,对机车安全运行存在较大的隐患。大量的实验和研究表明隧道内900MHz频段的无线信号覆盖效果更好。本文在详细介绍扩频通信技术的理论基础和对机车无线数据传输情况进行分析的基础上,提出了将扩频通信技术的优点应用于机车的无线数据传输模块,配合900MHz的传输频段的方案。包括900MHz射频部分的方案设计及上、下变频器以及天线的选择和应用方案。完成了以Stanford Teleco公司生产的可编程扩频芯片STEL-2000A为平台,用STC89C52单片机实现控制,包括高速A/D、D/A转换的基带扩频处理部分的硬件设计,并对模块进行了调试,调试结果达到了预期要求。 【英文摘要】For its strong resistance to multipath interference and interception rate and other significant advantages,spread spectrum communication technology is widely used in military communications.With the third generation mobile communication technology, more and more spread-spectrum communication technology used in civilian communications.China Railway, particularly in the southwest,mountains and more corners,more tunnels, more mountains of geographical features make the wireless communication channel is very bad. Kinds of unexpected interference will influence on the reliability of wireless data transmission,thus affect the safe operation of locomotives.At present, China locomotive application of wireless digital communications is mostly 450MHZ digital radio,the test showed that the radio transmission will appear in the tunnel signal interruption,and weak co-channel interference resistance. A large number of experiments and studies have shown that only 900MHz band wireless signal can transmit the tunnel.On the basis of describeing in detail ofthe theoretical spread spectrum ommunication technologyc and the analysis of the locomotives wireless data transmission, the paper takes the advantages of spread spectrum communication technology used in wireless data transmission module locomotive, applied with a 900MHz spread spectrum wireless data transmission program module,part of 900MHz RF design and the upper and lower frequency and ante