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摘要：本次设计首先通过列车上的GPS定位列车的列车名称、经度、纬度、速度等信息，然后通过GPRS－串口通讯，将信息传送到主控中心进行处理。然后将列车名称、经度、纬度、速度、预警显示、前方道口名称等信息显示在通讯界面上。本次设计的预警范围由时间来设定的，预警时间设定为180秒。当列车到达前方道口的时间小于180秒时，通讯界面中的预警显示为“预警”，同时主控中心向前方道口发送预警命令。如果前方道口收到预警命令，就向主控中心发送收到命令，然后开启灯光开启喇叭完成预警命令。如果主控中心接收到前方道口发送的指令就显示在通信界面的文本框中，不再向前方道口发送预警命令。如果主控中心没有收到前方道口发送的指令，那么通讯界面中的预警计次就会加1，然后再向道口发送预警命令。如果在列车到达前方道口的时间小于预警时间的一半时，主控中心仍未收到前方道口发送的收到指令时，主控中心就不再向前方道口发送预警命令，改向列车发送预警命令，通知列车司机在通过前方道口时要注意观察道口。21617
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毕业论文关键词： 铁路道口预警，GPS定位，GPRS－串口通讯，VB
Abstract： In this design, the GPS of the train will locate the train name , longitude, latitude , speed, and other information , and then sending information to a control center for processing through GPRS- serial communication .Then the train name , longitude, latitude , speed, warning displays , crossing name in front of the train and other information will be displayed on the communication interface after being processed.The design of the warning range is to set by the time , alarm time is set to 180 seconds this design.If the train reaches the front crossing in less than 180 seconds , the communication interface of the warning will be displayed as an "early warning " while warning control center sends commands to the front crossing. If the front crossing receives warning command ,it will sent received command to the control center , and then turns the lights and speaker on .If the control center receives a command sent by crossing in front of the train,communication interface will display the information in a text box, and does not send warning commands to the front crossing .If the control center does not receive instructions sent by crossing in front , then the communication interface metering will add a warning , and then sends warning command to the train.If when the train will arrive in the front crossing in less than half of the warning time , the main control center still has not received the instructions from the front crossing and then it will not send a warning order to the front crossing again instead sending a warning command to train driver to notify him of observing the front crossing when crossing.
Key Words：Railway crossing warning，GPS positioning，GPRS-serial communication，VB
目 录
铁铁路道口预警主控软件的设计 1
1 绪论 5
1.1 本课题的意义及目的、研究范围 5
1.1.1 本课题的意义及目的 5
1.1.2本课题的研究范围 5
1.2 国内外关于铁路道口预警的研究状况及发展趋势 6
1.2.1国内关于铁路道口预警的研究状况 6
1.2.2国外关于铁路道口预警的研究状况 9
1.2.3铁路道口预警的发展趋势 11
1.3本课题的指导思想 11
1.4本课题应解决的主要问题 13
２ 软件设计采用的关键技术及软件 13
2.1 GPS卫星定位技术 13