共查询到18条相似文献,搜索用时 828 毫秒
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基于GPS/GPRS的公交车自动报站系统设计 总被引:1,自引:0,他引:1
近年来,随着经济的持续发展,对公史运输也提出更高的要求.传统的公交报站器须由司机操控工作,考虑公交系统的安全,目前迫切需要智能化、自动化的公交报站系统.GPS及GPRS技术的应用使公交报站系统实现了高度的整合,改变了传统的手动报站方式,解决了目前国内现有的公交车内信息更新方式落后、不能监控调度等弊端.结合GPS定位,对车辆的状态信息(位王、速度等)进行实时采集及分析,当车辆到达预定位置时,实现公交车的自动报站功能;通过GPRS网络,将公交车的状态信息及时传输到公交监控调度中心,然后通过中心上位机软件的操作,实现对公交车的监控调度、信息更新的功能.采用SD卡存储多条线路信息及MP3语音文件,便于公交车更换公交线路,同时实现高品质语音信息的播放. 相似文献
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针对当前公交车手动电子报站的不足,设计了一种新型自动报站系统。通过将单片机控制技术、数字语音技术和短距离无线通信技术相结合来实现自动报站的功能,并给出了系统的总体结构和软硬件设计。该方案可以降低司机的工作强度,提高车辆运行的安全性,且成本较低,具有较强的实用价值。 相似文献
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采用北斗卫星定位结合无线传感器网络和移动互联网等技术提出设计了一种城市智能公交系统。考虑到公交车在行驶中可能出现的高层建筑物遮挡等因素导致卫星定位无效的情况,设计加入了6轴姿态传感器,运用航位推算算法,辅助定位。系统能够实现智能进站判断,自动语音报站,智能站牌提示,调度中心远程监控,手机查询车辆位置信息等功能。实际测试结果表明:在卫星定位无效,公交车行驶速度不大于60 km/h时,推算定位精度平均达到0.88 m,而北斗接收机定位精度为3 m,符合设计要求。该系统运行稳定,设备性价比高,为进一步促进城市公交系统智能化发展提出了参考性方案。 相似文献
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单片机智能语音提醒报站系统 总被引:1,自引:0,他引:1
文章介绍了采用AT89C51单片机控制语音芯片ISD4004,对公交车实现语音提醒报站。经过反复调试和上车试验,该系统工作稳定,功耗小,音量可调,输出的语音清晰,音色优美,显示直观,实现了公交车提醒报站的智能化和人性化。 相似文献
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李妍 《太赫兹科学与电子信息学报》2013,11(4):606-608
现在国内普遍采用的手动公交车报站系统经常出现人为错误,给市民出行和公交车运行带来许多不便。针对此问题,将无线射频识别技术、单片机控制技术、数字语音技术、发光二极管(LED)显示技术相结合,设计了一种新型自动报站系统,并给出了该系统的总体结构和软硬件设计。该系统结构简单易行,实现了公交报站的智能化,降低了驾驶员的工作难度,提高了公交车运行的安全性及报站的准确性,具有较强的实用价值及广泛的应用前景。 相似文献
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基于有源RFID的自动报站系统研究 总被引:1,自引:0,他引:1
根据RFID技术的通信原理,结合当前我国大多数城市公交报站方式的实际情况,设计了一种基于有源RFID技术的公交自动报站系统。系统中使用了专用射频发射与接收芯片CC1100、语音播放芯片VS1003和单片机控制,使用单片机对每一个车站进行ID编码,并利用身份识别技术实现了公交车自动报站功能。 相似文献
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GPS自动报站系统的设计与实现 总被引:5,自引:0,他引:5
给出了利用GPS卫星定位系统来采集车辆运行时的地理位置的经纬度、方位以及速度等信息的实现方法,利用该系统,可在上述信息经过AVR高速嵌入式单片机处理后,对预存的数据进行方向和距离误差分析,并在车辆行驶到达预定位置时,通过语音处理芯片对预先寻制的语音进行播报,从而达到自动报站的目的。 相似文献
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A movable boundary protocol is proposed for integrating packet voice and data in unidirectional bus networks. The head station on the bus learns the number of ready-to-transmit voice stations by reading a `request' bit in the header of the received packets and allocates the exact number of voice slots needed in each frame. The protocol guarantees that the maximum delay to transmit a voice packet will be less than the round-trip propagation delay at the head station plus twice the time needed to form the packet. The average data packet delay is evaluated via approximate analysis and simulation, for the case in which the voice-reserved slots in a frame are contiguous and for the case in which they are evenly distributed 相似文献
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A previously proposed protocol is extended to include voice for multiaccess communication over unidirectional broadcast bus networks. The authors use a framed approach for integrating these two traffic types where a frame, which is repeated, consists of a voice subframe followed by a data subframe. They use speech detectors for modeling speech sources in order to prevent the loss of about 60% of the bandwidth that would otherwise be required, and they use a moveable-boundary scheme in which the voice subframe size is estimated from the number of voice packets transmitted in the previous frame. The authors determine the fraction of speech loss and the fraction of wasted allocated bandwidth due to the estimator by formulating Markov chain for the number of ready voice stations at the frame boundaries. To analyze data performance, they use a nonhomogeneous Markov chain or a data station's buffer content just before the data slots visit that station. By proper control of the estimator function, they can guarantee an upper bound on the average speech loss at any voice station, and a combined voice-data throughput close to unity is achieved. Results from the analysis and from a simulation match closely 相似文献
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针对国内系统报站装置应用的现状.提出一个基于GPS全球定位的公交全自动报站系统。该装置公交采用MCS-51单片机及GPS定位技术.利用GPS模块测得的经纬度信息与存储在单片机中的站点的经纬度信息相比对,无论上行线路,还是下行线路,均能准确判断是否到站。同时,采用基于文本的语音合成技术,真正实现了全自动、准确地播报站名及服务提示信息。 相似文献
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Alarm and identification features of the Southern California rapid transit district bus radio system
《Vehicular Technology, IEEE Transactions on》1969,18(3):101-105
The Southern California Rapid Transit District (SCRTD) two-way radio system now in service provides voice communication and a silent alarm feature for safety purposes. The same equipment also provides automatic transmitter identification. These features have been accomplished using an added logic assembly installed in the driver's area of the bus not far from the handset hanger. The equipment sends four digits of vehicle identification, six digits of assignment information, and one digit of message type marking, generated with integrated circuit logic and transmitted with keyed audio tone. The assignment information is determined by a code card plugged in by the driver at the start of an assignment. At the base station, the information transmitted from each bus is first presented on a visual display in front of the dispatcher, recorded on a digital printer with a time code, and then analyzed for alarm and acknowledgment significance. In the event of an alarm, the location of the bus is known from the complete identification of route and run number. This information is used by dispatchers to provide rapid police assistance in emergencies. 相似文献
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公交预报站系统是城市智能交通系统的重要组成部分,可以有效地优化公交调度、提高市民乘车效率。本文设计了基于无线射频技术和STC12C5A单片机的公交预报站系统,可以代替常用的基于GPS技术的公交预报站系统。系统通过无线射频技术,以接力方式将公交到站信息传输到下行站点,并在站点通过语音和LED显示两种方式对即将到站的公交车信息进行预报,方便市民选择合适的公交乘车方式。本文主要介绍了系统的组成和硬件设计。 相似文献
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针对现有的航空总线系统结构复杂、传输速率低、电磁兼容性差等问题,提出了一种基于FPGA的总线型低压差分信号(BLVDS)总线解决方案.介绍了BLVDS的总线结构,对BLVDS的通信方式和基于FPGA使用硬件描述语言实现BLVDS总线通信的方法进行了深入研究.同时,分析了信号传输质量,在工程中验证了其高速率和高可靠的总线传输特性,为新一代航空高速总线系统提供了参考. 相似文献
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This work carries out an exact analysis of carrier sense multiaccess (CSMA) on the bus topology using fine-grain synchronization; that is, synchronization on the order of the distance between adjacent stations. The author models a system with a finite number of users transmitting on a bus using CSMA without collision detection. The model can accommodate any arbitrary station distribution. He evaluates the throughput of the system and shows how the station location on the bus affects the throughput achieved by the different stations. The model is also used for a slightly modified version of the CSMA protocol with collision detection 相似文献