MCS-51单片机与GPS-OEM板数据通讯的研究与应用

本文介绍了在汽车仪表智能导航系统中单片机与 GPS- OEM板的数据通信原理 ,并以MCS- 51系列单片机为例 ,给出了一种单片机与 GPS- OEM板间的串行通信实现方法     

车辆监控导航系统中的应用技术

车辆导航技术是方便、快速正确引导汽车抵达目的地的一种技术 ,它在提高汽车运行效率、节约能源方面具有重要意义。目前 ,最新的 GPS技术、通信技术、GIS技术、组合导航和地图匹配技术在汽车工业领域得到应用。本文依据该系统的原理与结构 ,着重阐述了这些技术在该系统中的应用。     

Performance measures and data requirements for congestion management systems

Many metropolitan areas have started programs to monitor the performance of their transportation network and to develop systems to measure and manage congestion. This paper presents a review of issues, procedures, and examples of application of geographic information system (GIS) technology to the development of congestion management systems (CMSs). The paper examines transportation network performance measures and discusses the benefit of using travel time as a robust, easy to understand performance measure. The paper addresses data needs and examines the use of global positioning system (GPS) technology for the collection of travel time and speed data. The paper also describes GIS platforms and sample user interfaces to process the data collected in the field, data attribute requirements and database schemas, and examples of application of GIS technology for the production of maps and tabular reports.     

Development and evaluation of a hybrid travel time forecasting model

The purpose of this paper is to develop and evaluate a hybrid travel time forecasting model with geographic information systems (GIS) technologies for predicting link travel times in congested road networks. In a separate study by You and Kim (cf. You, J., Kim, T.J., 1999b. In: Proceedings of the Third Bi-Annual Conference of the Eastern Asia Society for Transportation Studies, 14–17 September, Taipei, Taiwan), a non-parametric regression model has been developed as a core forecasting algorithm to reduce computation time and increase forecasting accuracy. Using the core forecasting algorithm, a prototype hybrid forecasting model has been developed and tested by deploying GIS technologies in the following areas: (1) storing, retrieving, and displaying traffic data to assist in the forecasting procedures, (2) building road network data, and (3) integrating historical databases and road network data. This study shows that adopting GIS technologies in link travel time forecasting is efficient for achieving two goals: (1) reducing computational delay and (2) increasing forecasting accuracy.     

闽江干流GPS控制网的建立

利用ＳＹ－１１８型ＧＰＳ接收机建立了闽江干流ＧＰＳ控制网,取得了良好的成果。文中着重介绍该机配套预处理ＳＹＧＰＳ软件和后处理ＮＥＴ软件进行数据处理的情况,得出了一些有益的结论。     

A three-stage computational approach to network matching

Network matching is frequently needed for integrating data that come from different sources. Traditional ways of finding correspondences between networks are time-consuming and require considerable manual manipulation. This paper describes a three-stage matching algorithm (node matching, segment matching, and edge matching) that combines bottom-up and top-down procedures to carry out the matching computation. As it uses sensitive matching measures, the proposed algorithm promises good improvement to existing algorithms. An experiment of matching two waterway networks is reported in the paper. The results of this experiment demonstrate that a reasonable matching rate and good computational efficiency can be achieved with this algorithm. The paper also briefly discusses necessary improvements in areas of linear alignment, aspatial matching and higher-level matching.     

沉管隧道管节沉放实时定位测量技术现状分析

文章在调研国内外沉管隧道工程实例的基础上对管节沉放实时定位测量方法进行了分析研究,重点介绍了应用较为广泛的几种测量方法,如全站仪法、GPS法、声纳法和机械法的特点、原理及现场应用,并对4种定位测量方法的优缺点进行了比较,给出了每种定位测量方法的适用范围,为以后类似工程定位测量方法的选取提供了参考依据。     

轨道交通工程BIM+GIS云平台微服务架构研究

为解决轨道交通工程BIM+GIS云平台在多站点、多区间、多线路管理中,BIM、GIS数据量大、数据服务庞杂、并发访问量大等问题,研究分析单体服务架构缺陷和微服务架构优势,在制定微服务拆分方式和设计原则的基础上,实现了轨道交通工程BIM+GIS云平台的微服务架构设计.并在大连地铁5号线火梭区间海底盾构隧道施工中进行应用....     

关于航海类专业教材建设的若干思考

对航海类专业教材建设尤其是航海职业教育的教材建设提出了积极的建议,指出了当前教材改革力度不足,影响了船员考试的有效性。     

拓普康双频RTK GPS接收机在工程测量中的应用

介绍RTK技术的产生、发展、应用现状以及RTK的组成、测量精度指标、软件系统。以鞍钢鲅鱼圈工程及鞍钢厂区技术改造为例,研究在具体工程中如何施测RTK、提高RTK的测量精度,拓宽RTK的应用范围。通过实例和具体数据证明利用静态GPS测量的解算数据求得WGS84坐标和地面坐标的转换参数,根据工程对精度的要求设置RTK观测的历元数,能够提高RTK的测量精度和工作效率,满足工程的需要。