共查询到17条相似文献，搜索用时 421 毫秒
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针对远离大陆的海岛礁地形测绘与高程基准转换困难的问题,基于ADS40航摄系统获取远离大陆的海岛礁区域遥感影像,按照GPS差分无地面控制点的空中三角测量模式实现海岛礁的地理定位,选择高精度的卫星测高模型实现海岛礁区域的高程基准转换。在某海域进行了ADS40测量作业与高程基准转换试验,结果表明,无地面控制点空中三角测量的平面精度达到0.587m;基于卫星测高模型进行垂直基准转换的精度与同步验潮水位观测法得到的高程传递精度相当。 相似文献
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文中基于GNSS高精度定位解算成果中的高程数据,利用测船航行过程中实时采集的姿态数据进行涌浪补偿,并根据船舶每天的吃水变化将GNSS天线高调整为瞬时水面高;通过相邻水位站的比对获取GNSS高程与深度基准面的高差,对获取的瞬时水面高进行基准面变换,得到基于深度基准面的潮位值。针对以上技术路线进行了研究,并在工程中进行了验证,成果统计数据证明,提取的潮位满足规范要求,可在实践中应用推广。 相似文献
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通航水深是船舶在某时段沿着一定航线通过特定区域的最浅水深，对船舶的安全航行具有重要意义。海图测绘时将水深归算至深度基准面，由验潮资料求得，而潮汐值是通过临近区域发布的潮汐表来进行推算，由此获得的通航水深精度不
高，且不同港区之间采用深度基准不统一，所以无法为船舶提供精确、连续的通航水深。本文提出了一种基于高精度 GNSS的通航水深测量方法，直接测量海底高程，通过精密数值模型模拟海面高程，由此获得通航水深，并提出了实时通航水深的应用模式。为了建立与陆地地形相衔接的海底地形模型，以 CGCS2000 参考椭球面为垂直参考基准面，深度基准面采用 POM（Princeton Ocean Model） 模式进行潮波数值模拟的方法构建。实验结果显示：数值模型精度较高，构建的深度基准面误差在5 cm 以内。本文提出的方法改变了传统的通航水深测量及服务模式，提供高效率、高精度通航水深、海图水深数据，可为船舶用户提供实时动态水深服务。 相似文献
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通过对珠江口水域海事管理的需求分析，利用航天／航空影像，数字高程数据、海事电子地图数据，以及航政、助航等专题资料，研制开发珠江口水域三维形式的地理信息系统，实现查询、浏览、管理等功能，为海事管理提供方便直观的工作平台。 相似文献
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Height datum is an important part of national geodetic network. Establishment of a unified national land and sea elevation benchmarks and implementation of height datum connection between the Chinese mainland and offshore islands are issues that need to be resolved in geomatics and marine sciences. Derived from basic definition of elevation datum and relationship between geo-potential and normal height, the scientific theory and algorithm for transferring height datum from mainland to islands with geo-potential are elaborated. The accuracy of geo-potential difference is discussed using a numerical analysis method. We also give criteria to choose virtual leveling routines and algorithm to give optimized results. One experiment in the China seas, among 26 tidal gauge stations in the sea coast of the mainland with known normal height, has confirmed the reliability and accuracy of the method developed in this paper. Further optimizations for improving accuracy of island elevation are also introduced. Distribution of quasi-geoid near Xisha Islands is also given with this method. 相似文献
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海底大地基准网将是新一代国家综合PNT（Positioning, Navigation and Timing）系统建设的重要组成,也是未来海洋立体观测系统的基础设施。联合全球卫星导航定位系统和声学测距的GNSS-声学定位技术可用于高精度水下定位,直接服务于海底大地基准网建设。本文聚焦海底大地基准建设技术,简要梳理了国内外水下声学导航定位技术及系统背景,分析总结了海底大地基准建设的站址勘选及布放技术要点,在讨论GNSS-声学观测平台和数据采集技术基础上,重点探讨了GNSS-声学定位的数据处理方法研究进展,最后简单介绍了GNSS-声学的当前主要应用并展望了未来海底大地基准建设的技术需求和应用问题。 相似文献
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Underwater Navigation Based on Real-Time Simultaneous Sound Speed Profile Correction 总被引：1，自引：0，他引：1
Precise sound speed profile (SSP) information is critical when using sonar for underwater terrain navigation. Nevertheless, acquiring SSP information in real-time is difficult, especially in underwater navigation environment. To account for this problem, this paper presents an underwater navigation method that applies real-time SSP correction to the terrain measurements. The method uses a probe to measure the surface sound speed simultaneously. Meanwhile, redundancy of topographic measurement data is exploited to derive the equivalent SSP information. The acquired equivalent SSP is updated continuously with particle filter algorithm. The terrain measurements can be corrected in real-time with the equivalent SSP to improve the performance of underwater terrain navigation. By removing the impact of inaccurate SSP from the terrain measurements, the proposed method can achieve precise and robust underwater navigation result without using an underway-profiling instrument. Simulated results confirm the good performance of the proposed method. 相似文献
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