共查询到18条相似文献，搜索用时 140 毫秒
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在分析地形高程匹配导航技术发展现状和应用领域的基础上,系统梳理了地形高程匹配导航现有相关标准。在研究已有标准体系结构的基础上,提出了地形高程匹配标准体系新的框架结构;并根据技术的发展趋势,对急需制定的标准内容提出了意见和建议。 相似文献
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简单介绍了现有的卫星导航定位系统之一的GPS的用户机现状,阐述了作为当今一种一球信息基础设施的卫星导航定位系统的应用设备标准体系。 相似文献
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惯性导航(inertial navigation system,INS)具有自主、无源导航的特点,但其定位误差会随时间积累,难以满足载体长时间精密水下导航需要.地磁匹配导航以地球固有物理特征地磁为匹配对象,通过线图匹配实现导航,具有无源、隐蔽性强和匹配特征明显等优点,可以实现对INS积累误差的修正,是一种极佳的辅助INS水下导航手段.因此,研究以惯性导航为主,地磁匹配导航为辅的水下组合导航技术,可以满足水下潜艇导航对精度和隐蔽性的双重要求,也成为目前的研究热点.
论文在分析国内外研究现状的基础上,开展如下研究: 相似文献
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在智能化交通系统的研究中,许多国家都认识到标准的重要性,因此一些国家和国际标准化组织制定了有关标准,如国际标准化组织(ISO)204技术委员会(TC204)第三工作组(WG3)针对智能交通领域的地图数据库建设与数据交换而开发的标准。另外,美国、日本针对导航产品而制定了“SDAL”和“KIWI”标准,从而规范了市场,在有序的环境下保证了本国导航产品的生产并向外 相似文献
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北斗卫星导航系统已建成区域导航星座,可在亚太范围提供无源定位、导航和授时服务。本文系统研究了北斗系统标准单点定位算法,采用实测数据对北斗系统和GPS标准单点定位算法进行了算法验证和数据分析。实验结果表明,北斗系统标准单点定位在X、Y和Z方向上的精度分别为7.1 m、9.2 m和13.2 m,GPS标准单点定位在X、Y和Z方向上的精度分别为6.2 m、5.8 m和11.2 m,北斗系统与GPS标准单点定位的三维定位精度基本一致,证明了北斗系统已经具有独立导航定位能力,可为标准导航定位应用提供服务。 相似文献
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目前国内关于DNC标准方面的研究较少,为了更好地利用标准,便于各类人员使用DNC数字海图数据,文中首先介绍DNC标准和CDC标准的基本情况,然后通过两种数据标准对照分析,找出标准之间所有的差异性,最后结合实际提出相关工作人员在工作中应注意的问题。经过实践证明,文中的研究成果能够加快我国CDC标准的完善。 相似文献
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Many municipal activities require updated large-scale maps that include both topographic and thematic information. For this purpose, the efficient use of very high spatial resolution (VHR) satellite imagery suggests the development of approaches that enable a timely discrimination, counting and delineation of urban elements according to legal technical specifications and quality standards. Therefore, the nature of this data source and expanding range of applications calls for objective methods and quantitative metrics to assess the quality of the extracted information which go beyond traditional thematic accuracy alone. The present work concerns the development and testing of a new approach for using technical mapping standards in the quality assessment of buildings automatically extracted from VHR satellite imagery. Feature extraction software was employed to map buildings present in a pansharpened QuickBird image of Lisbon. Quality assessment was exhaustive and involved comparisons of extracted features against a reference data set, introducing cartographic constraints from scales 1:1000, 1:5000, and 1:10,000. The spatial data quality elements subject to evaluation were: thematic (attribute) accuracy, completeness, and geometric quality assessed based on planimetric deviation from the reference map. Tests were developed and metrics analyzed considering thresholds and standards for the large mapping scales most frequently used by municipalities. Results show that values for completeness varied with mapping scales and were only slightly superior for scale 1:10,000. Concerning the geometric quality, a large percentage of extracted features met the strict topographic standards of planimetric deviation for scale 1:10,000, while no buildings were compliant with the specification for scale 1:1000. 相似文献
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《制图学和地理信息科学》2013,40(3):132-135
The concept of a framework for data and information linkages among producers and users, known as a National Spatial Data Infrastructure (NSDI), is built upon four corners: data, technology, institutions, and standards. Standards are paramount to increase the efficiency and effectiveness of the NSDI. Historically, data standards and specifications have been developed with a very limited scope — they were parochial, and even competitive in nature, and promoted the sharing of data and information within only a small community at the expense of more open sharing across many communities. Today, an approach is needed to grow and evolve standards to support open systems and provide consistency and uniformity among data producers. There are several significant ongoing activities in geospatial data standards: transfer or exchange, metadata, and data content. In addition, standards in other areas are under discussion, including data quality, data models, and data collection. 相似文献