共查询到18条相似文献,搜索用时 890 毫秒
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随着导航技术的发展,个人移动导航系统成为人们关注的热点。本文介绍了一种基于MapX Mobile开发的个人移动导航系统,实现GPS信号的接收和处理、GPS信号点的地图匹配。通过对地图上导航点、线的设置,可以在PDA上准确、快速地进行自主导航。 相似文献
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针对目前地图数据手工分发方式时效性差以及网络分发安全性低的问题,将信息隐藏技术引入到地图数据网络分发过程中,旨在提高地图数据分发的安全性和时效性。在对地图数据网络隐藏分发一般流程进行描述的基础上,重点对地图数据的分发前组织与接收后重组、地图数据隐藏与分析等关键技术进行详细的剖析,为地图数据网络隐藏分发技术的进一步研究奠定基础。 相似文献
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当前多源地图数据的非共享性等特点严重制约了地图数字出版流程的顺利开展。为了有效解决多源地图数据到印前数据的转换问题,根据多源地图数据的类型及特点,结合出版对地图数据的特殊要求,建立并实现了一套完整的由多源地图数据转换为印前数据的方案,并通过具体应用得到有效的验证。 相似文献
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GPS/GSM技术在近海海洋环境监测中的应用研究 总被引:2,自引:0,他引:2
通过GSM/GPS技术在水深遥测系统中的应用,对海洋环境监测的自动化、实时化和监测数据的远距离传输作初步探讨和研究。本研究以VB为开发语言,以GSM网络的SMS服务为载体,以传输GPS定位信息和测深数据为例,达到实时定位和远程无线传输的目的。 相似文献
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GPS技术在城市交通状况实时检测技术中的应用 总被引:2,自引:0,他引:2
该文介绍 1种检测城市交通状况的新方法。在利用 GPS对车辆的定位与导航的基础上 ,进一步利用 GPS提供的即时速度和准确的时间信息 ,通过数学建模 ,得到交通流量、平均车速、行程时间、车道占有率等一系列重要交通状况信息 ,以实现交通状况的实时检测 ,为城市交通管理系统智能化的实现提供必要保证。 相似文献
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Y. Gao 《Marine Geodesy》2013,36(4):279-288
Global positioning system (GPS) has found applications in various areas including marine geodesy. GPS positioning accuracy, however, is greatly degraded by GPS ephemeris and clock errors, particularly errors due to Selective Availability (SA). Thus, it is crucial to use precise ephemeris and clock corrections for users who require high position accuracy. Presently, precise ephemeris and clock corrections are available only in post‐mission. This paper investigates the generation of precise real‐time ephemeris and clock corrections and the positioning accuracy using them. In this research, precise real‐time ephemeris is generated from accurate dynamic orbit prediction and clock corrections are calculated using instantaneous GPS measurements. Numerical analysis using data from an actual GPS tracking network is performed that indicates use of precise ephemeris and clock corrections can improve the positioning accuracy to the one meter level. This accuracy is attainable in real‐time as the precise real‐time ephemeris and clock corrections become available in the future. 相似文献
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《中国海洋工程》2015,(6)
To achieve accurate positioning of autonomous underwater vehicles, an appropriate underwater terrain database storage format for underwater terrain-matching positioning is established using multi-beam data as underwater terrainmatching data. An underwater terrain interpolation error compensation method based on fractional Brownian motion is proposed for defects of normal terrain interpolation, and an underwater terrain-matching positioning method based on least squares estimation(LSE) is proposed for correlation analysis of topographic features. The Fisher method is introduced as a secondary criterion for pseudo localization appearing in a topographic features flat area, effectively reducing the impact of pseudo positioning points on matching accuracy and improving the positioning accuracy of terrain flat areas. Simulation experiments based on electronic chart and multi-beam sea trial data show that drift errors of an inertial navigation system can be corrected effectively using the proposed method. The positioning accuracy and practicality are high, satisfying the requirement of underwater accurate positioning. 相似文献
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To achieve accurate positioning of autonomous underwater vehicles, an appropriate underwater terrain database storage format for underwater terrain-matching positioning is established using multi-beam data as underwater terrain-matching data. An underwater terrain interpolation error compensation method based on fractional Brownian motion is proposed for defects of normal terrain interpolation, and an underwater terrain-matching positioning method based on least squares estimation (LSE) is proposed for correlation analysis of topographic features. The Fisher method is introduced as a secondary criterion for pseudo localization appearing in a topographic features flat area, effectively reducing the impact of pseudo positioning points on matching accuracy and improving the positioning accuracy of terrain flat areas. Simulation experiments based on electronic chart and multi-beam sea trial data show that drift errors of an inertial navigation system can be corrected effectively using the proposed method. The positioning accuracy and practicality are high, satisfying the requirement of underwater accurate positioning. 相似文献
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