共查询到15条相似文献，搜索用时 78 毫秒
1.
海底地磁日变观测站能够提供合适的地磁日变改正资料,可有效提高远海区磁测的成果精度。在海底地磁日变观测站布放过程中,对浮球、磁力仪、声学释放器及释放装置等进行必要的加固连接及改进,有助于提升整套观测系统的安全性,满足长时间自动观测和事后回收的需要。 相似文献
2.
地磁日变改正数据的合理选取直接关系到海洋磁测的成果精度。通过在南海南部海域布放的一个4 000m长的地磁观测潜标及同步开展的磁力测量,并在收集周边陆域地磁台站数据的基础上,对水体中获得的地磁日变观测数据和水面磁测数据进行综合分析和研究,得到几点认识:(1)浅水海域获得的日变观测数据用于海洋磁测数据处理时,其测量准确度比深水海域的好,且与陆域地磁台站数据曲线的一致性要高;(2)船磁校正曲线是否对称与地磁日变观测数据的合理选取密切相关;(3)在远海区磁测时,为确保详尽记录局部磁扰,建议海底地磁日变观测站应布放于靠近工区、水深较浅的水体之中。 相似文献
3.
4.
5.
6.
7.
南海海底地形以复杂著称,适合布放沉底自容式观测仪器的海区不多。通过对南海海底地形、水深、通航条件及作业时间的科学合理分析,为南海海域海底日变站布防选址提供了有效方法并取得良好的实际效果,确保了南海水下地磁日变观测的安全性。 相似文献
8.
9.
提出地磁日变改正中需要顾及地磁长期变化和磁扰的可靠分离,保证磁力数据改正处理具有明确的基准,提高拼接整合的精度.如果日变站能够控制测区,两者可采用时间同步固定的地磁正常场作为磁异常基准,测区的地磁长期变化由日变站实测的地磁长期变化来改正,反之,对日变站和测区应分别采用时间同步变化的地磁正常场作为磁异常基准,测区的地磁长期变化由地磁正常场的地磁长期变化来改正.为此,应该明确定义与时间相关的日变改正基值为地磁正常场与地磁异常之和.通过磁静日总场观测值偏离正常场的某种形式的长期平均值,可以逼近日变站的地磁异常.磁扰的分离应保证磁扰初动和消失相对于磁静日无磁扰的连续过渡.采用综合模型一并进行日变改正、正常场及其长期变化改正,可以更好地解决目前日变改正中遇到的问题. 相似文献
10.
11.
Kawaguchi K. Hirata K. Nishida T. Obana S. Mikada H. 《Oceanic Engineering, IEEE Journal of》2002,27(2):182-192
Although submarine cable in-line seafloor observation systems are very effective tools for real-time/long-term geo-scientific measurements,, there are technological difficulties for deploying as many sensors as on land. To solve this problem, JAM-STEC developed an expandable and replaceable satellite measurement station called the adaptable observation system (AOS). The AOS is a battery operated mobile observatory connected to the backbone cable system by a 10 km long thin fiber cable to ensure real-time data recovery. The system consists of a branching system, a junction box, a fiber cable, and a battery system for a six-month operation. Installation and construction of the AOS will be conducted by a towed vehicle and an ROV. A thin fiber cable-laying system was developed and tested for practical operation. This observation system provides a chance to extend existing seafloor networks from an in-line area to a wider area 相似文献
12.
海底小型铁磁目标探测一直是海洋工程勘察的难点,结合我国近岸某海域海底一处未爆弹的探测实例,介绍了SeaSPY2磁力仪的性能特征,阐述了海洋磁力仪探测数据采集和处理流程。通过对探测出的磁力异常区和同期多波束扫测数据的分析,推断出水下未爆弹的具体位置和大小,为引爆未爆弹提供了准确的数据。此外,根据实践经验,提出了采用木船牵引、利用定高拖曳装置固定磁力探头、选择合适的作业时间、选定合适的日变站位置等四点建议,提高海洋磁力探测精度,为类似项目的应用提供参考。 相似文献
13.
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
14.
15.
《Marine Geodesy》2012,35(1):1-22
AbstractThe deep seafloor is closest to the Earth’s interior and there are complicated interactions in the physical and biological processes of the seafloor. Oceanographic parameters such as temperature, salinity, and ocean current can provide support for climate prediction. Therefore, the long-term observation of the deep seafloor is critical to the study of global climate change and the biodiversity in complex environments. For the requirements of long-term observation and remote data transmission in the deep sea of the South China Sea, a seafloor observation prototype system is designed in this paper as a stand-alone observation platform. We then proposed a date management method based on Controller Area Network to ensure the data quality. Distributed data management can be performed through system layering, and strict data transmission standards are established between each layer. At the same time, aiming at the difficulty of seafloor video data transmission in real-time, a new solution based on satellite communication technology, object detection technology, and high-efficiency compression coding technology of video images is proposed to provide support for seafloor biodiversity research. The observation data from the experiment are given, and these results show that the system can meet the requirements of long-term observation and remote real-time data transmission, and the reliability of the system is verified. 相似文献