共查询到19条相似文献,搜索用时 203 毫秒
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全球定位系统(GPS)应用于汽车,介绍了全球定位系统(GPS)的构成及定位原理,叙述了它在汽车监测、定位、导航中所发挥的重要作用. 相似文献
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全球定位系统(GPS)是当今世界上最高精度的一种星基无线电导航系统.文中介绍了GPS及其在欧、美、日等国家智能交通系统(ITS)中的运用和最新进展,并就GPS在我国的应用进行了分析,提出了建议. 相似文献
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车载定位技术在出租车调度系统中的应用 总被引:1,自引:0,他引:1
介绍了出租车调度系统的构成及其功能。调度指挥中心系统作为调度系统的核心,能够实现卫星定位、查询管理、电招、报警等功能。而车载定位导航系统主要是借助GPS(GlobalPositionSystem)全球定位系统来实现的。GPS全球定位系统是全球性、全天候、连续的卫星无线电导航系统,它可提供实时的三维位置,三维速度和高精度的时间和信息。出租车调度系统的建立可有效地提高出租车行业的服务水平和城市文明形象。 相似文献
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采用Leica公司的GPS350全球定位系统定时动态(RTK)测量模式,在极短的时间内高精度地完成了常规测量无法完成的道路中桩测量任务。该文介绍RTK技术的工作原理、具体操作和心得体会。 相似文献
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介绍了GPS(全球定位系统)的构成,阐述了GPS技术在整车性能测试(包括测量速度、距离、加速度、跑偏量与姿态角等)中的应用原理,推导了行驶跑偏量与姿态角的计算方法。结果表明,GPS技术能够达到非常高的测试精度,并且在整车试验中可以测量很多现阶段其他传感器无法测到的试验参数,为整车性能测试领域中的诸多试验提供解决方案与理论基础。 相似文献
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广东中 (山 )~江 (门 )高速公路全长 2 7.6km ,路线勘测与施工时间相隔较长 ,因此 ,施工前进行了施工测量控制网建网。较全面地介绍了采用全球定位系统 (GPS)进行施工测量控制的情况 ,实践表明 ,采用GPS方法进行高速公路施工首级测量控制网的建网 ,具有建网精度好、作业效率高、建网周期短和方便快捷等特点 相似文献
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车辆道路试验数据实时采集系统研究 总被引:1,自引:0,他引:1
本文介绍了一种基于CAN总线通信技术、GPS全球定位技术、GPRS移动通信技术等为一体的试验数据采集传输系统,通过该系统在重型电控柴油商用车上的应用,解决了汽车道路试验中环境极端、工况复杂、里程长,数据繁杂、试验数据无法及时、准确获取等问题,重点讲述了车辆道路试验数据实时采集方法的实现。 相似文献
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车队管理系统是以车辆为基础,整合车辆数据记录、卫星定位和数据通信等功能的后台应用系统.可提供有效的车辆及驾驶员管理、实时车辆运送信息及安全监管信息。本文分析车队管理系统的发展历程;介绍车队管理系统的行业标准并提出相关建议。 相似文献
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A map-matching algorithm is an integral part of every navigation system and reconciles raw and inaccurate positional data (usually from a global positioning system [GPS]) with digital road network data. Since both performance (speed) and accuracy are equally important in real-time map-matching, an accurate and efficient map-matching algorithm is presented in this article. The proposed algorithm has three steps: initialization, same-segment, and next-segment. Distance between the GPS point and road segments, difference between the heading of the GPS point and direction of road segments, and difference between the direction of consecutive GPS points and direction of road segments are used to identify the best segment among candidates near intersections. In contrast to constant weights applied in existing algorithms, the weight of each criterion in this algorithm is dynamic. The weights of criteria are calculated for each GPS point based on its: (a) positional accuracy, (b) speed, and (c) traveled distance from previous GPS point. The algorithm considers a confidence level on the assigned segment to each GPS point, which is calculated based on the density and complexity of roads around the GPS point. The evaluation results indicate 95.34% correct segment identification and 92.19% correct segment assignment. The most important feature of our algorithm is that the high correct segment identification percentage achieved in urban areas is through a simple and efficient weight-based method that does not depend on any additional data or positioning sensors other than digital road network and GPS. 相似文献
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根据低成本车辆GPS/DR组合定位系统传感器精度低和计算能力弱的特点,提出一种改进联合卡尔曼滤波(FKF)算法,并简化主滤波器信息融合算法,稍微降低融合精度,提高计算效率。试验结果表明,提出的改进联合滤波算法具有融合精度高、容错性好、计算量小、便于工程实现等优点。 相似文献
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随着全球定位技术的不断发展,GPS在工程建设领域的应用也越来越广泛。该文主要介绍GPS在三维定位方面的优点,并讨论其代替精密水准测量(沉降观测)及传统的水平位移监测的可能性。 相似文献
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Truck probe data collected by global positioning system (GPS) devices has gained increased attention as a source of truck mobility data, including measuring truck travel time reliability. Most reliability studies that apply GPS data are based on travel time observations retrieved from GPS data. The major challenges to using GPS data are small, nonrandom observation sets and low reading frequency. In contrast, using GPS spot speed (instantaneous speed recorded by GPS devices) directly can address these concerns. However, a recently introduced GPS spot-speed-based reliability metric that uses speed distribution does not provide a numerical value that would allow for a quantitative evaluation. In light of this, the research described in this article improves the current GPS spot speed distribution-based reliability approach by calculating the speed distribution coefficient of variation. An empirical investigation of truck travel time reliability on Interstate 5 in Seattle, WA, is performed. In addition, correlations are provided between the improved approach and a number of commonly used reliability measures. The reliability measures are not highly correlated, demonstrating that different measures provide different conclusions for the same underlying data and traffic conditions. The advantages and disadvantages of each measure are discussed and recommendations of the appropriate measures for different applications are presented. 相似文献
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