| 120emergency command system is an important part in the city’s emergency commandsystem, which functions and emergency mode impact dictate, organiztion, coordinating roleand status on major accidents and emergenciesdirectly.The mobile phone is mainly used tocommunicated between vehicle terminal and the first-aid station in the120emergencysystem,which generats incomprehensive and incollaborative information,so, the conditionof the patient in the ambulance can not return to the first aid station or hospital on time andthe aid station or hospital can not resort pre-hospital care and other measures effective andtimely.In response to these problems,computer technology,3G wireless communicationstechnology and Beidou positioning technology are combined to applicated in dataacquisition, wireless communications and positioning on the mobile terminal effectively.Inthis paper,a powerful120vehicle terminal data acquisition system is designed based on theBeidou module, ARM9and Linux operating system which used the embedded systems asdevelopment technology, Samsung Mini2440as development board, S3C2440as the centralprocessor.The collected multi-channel data are mainly including medical equipment datawhich are collected by the Ethernet port,Beidou module positioning information which arecollected by the serial port,car information which are collected by CAN bus,communicationinformation which used the world’s leading3G wireless communication technology.At thesame time of design,it inherited a rich peripheral interfaces such as USB, serial port, Ethernetport and so on.Firstly，this paper analyzed the composition, function, as well as the key technology of the120-vehicle terminal, proposed the hardware design and method of multi-channel dataacquisition system,completed design and implementation of application software of dataacquisition application system,and completed the preparation and test of serial driver.At last, the collected data are compressed by hybrid algorithm in order to save bandwidth andimprove communication rate through the process of communication.The experimental results show that120vehicle terminal based on the Beidou can capturemultiple data successfully and have data interaction with the command center via3G wirelesscommunication in order to meet the practical requirements.At the same time,the collected datahave compressed effective so that this system reduced equipment power consumption andimproved communication rate significantly. |
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