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为定期检验重力仪器和测定仪器格值,国家地震局系统除在北京、南京建立了全国统一的重力检定基线以外,已有九个省市建立了重力比较基线。这些基线的建立不仅提供了检定仪器的场地,而且是重力测定工作在测量精度、工作方法等方面的一次重要的基础实验。它为重力复测工作在改进工作方法和提高测量精度方面提供了重要的实测资料和可靠的论据。 本文将用以上各重力基线的测定资料,对基线测定结果,三程复测和精度估算等问题进行一些讨论和评述。 相似文献
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张连甲 《大地测量与地球动力学》1988,(3)
本文分别对AGA—8,AGA—600测距仪进行仪器加常数测定的资料用数理统计的方法,进行了数据处理,对每台仪器三种方法的偶然误差和系统误差进行了比较,得出了AGA—8测距仪采用600米塑料反光镜法和短基线法,AGA—600测距仪采用600米AGA反光镜法和短基线法同精度的结论,并通过对常数测定的分析证明了检验结果的正确性,提出了较优的测定方法。 相似文献
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研究了北斗动态单历元的周跳探测及模糊度解算方法,并编制相关基线解算软件。在我国中纬度某城市采集实测数据,测试分析该算法解算短基线的内符合精度及外符合精度。结果表明,北斗短基线南北方向精度优于7 mm,东西方向精度优于5 mm,高程方向精度优于15 mm,外符合位置精度优于5 mm。 相似文献
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提出一种提高短基线相对精度的测定方法。 试验表明，在测角误差影响等同或小于测距误差影响的情况下，该方法能使短基线的相对精度提高4~6倍。 相似文献
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基于Windows研制WinTrack高频单历元GPS双差解算软件,进行10 Hz短基线和1 Hz中基线高频观测、动态差分解算及精度分析。试验表明,中短基线条件下,高频单历元GPS双差解的保守精度为cm级,与数据质量、观测条件及时机等因素相关;不同精密星历条件下的解算精度一致,而5 m精度广播星历对短基线结果最大差异小于1 mm。 相似文献
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一、CORS技术概述
（一）CORS的工作原理
CORS是一个在较大的区域内均匀布设多个连续运行GPS参考站,在网络CORS系统中可采用虚拟参考站技术。虚拟参考站技术就是利用地面布设的多个参考站组成GPS连续运行网络,综合利用各个基站的观测信息,通过精确的误差模型修正距离相关误差,在用户站附近产生一个物理上不存在的虚拟参考站,与用户站构成短基线或者超短基线差分,用户站接收该基准站的差分信息进行定位。该系统解决了RTK作业距离上的限制问题,并保证了用户的精度,得到高精度的定位结果。CORS技术目前在方法上分成VRS、FTK、主辅站技术等。 相似文献
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应用线性回归、符号检验等数理统计方法研究了１９９３年完成的跨青藏高原首期ＧＰＳ网３９条基线的数据处理结果。通过对单基线观测中误差、重复观测基线互差及异步环闭合差的精度分析，认为由１６个观测点组成的跨青藏高原ＧＰＳ监测网的基线平均相对精度达０．１ｐｐｍ。 相似文献
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介绍北京高崖口国家重力仪短基线标定场的测量情况,分析高精度相对重力联测和使用A10绝对重力仪进行4期校准得到的结果精度。结果表明,高崖口短基线场基2点与基5点间的重力段差长期变化在20 μGal以内,点位稳定可靠。 相似文献
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利用广州南沙区GPS地面沉降系统2012-07~2013-12的GPS数据,采用3种不同的基准点方案进行数据处理,计算得到18个月的GPS监测点沉降序列。分析表明,测区位于低纬度地区,电离层活动剧烈,即使基线小于10 km,基线长度对单频监测点的解算精度影响仍然较大,而对双频点影响很小|以短基线为原则进行处理后沉降序列RMS为5 mm左右,由此计算的沉降速度与水准监测结果基本吻合,但单频监测点的精度还有待提高。 相似文献
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<2000国家重力基本网>短基线的检定与分析 总被引：3，自引：1，他引：2
对《2 0 0 0国家重力基本网》工程短基线进行了复测。经资料处理 ,庐山基线各测站相对重力值精度的平均值为± 0 .0 30 μm·s-2 ,各测段重力差精度的平均值优于± 0 .0 4 2 μm·s-2 ;灵山基线分别为± 0 .0 32 μm·s-2 和± 0 .0 4 5 μm·s-2 ;两条基线最大重力差分别比原来减少 0 .0 8μm·s-2 和增加 0 .0 3μm·s-2 ;新引进的两台重力仪分别在长基线和短基线上标定的一次项系数K1没有显著差异。采用三角多项式模拟LCR -G115 0重力仪的周期误差 ,在短基线上进行了成功的标定 ,并取得显著的改正效果。 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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The GRV 024516 and GRV 024517 meteorite samples collected from Grove Montains,Antactica are ureilite and H5 ordinary chondrite,respectively.Based on the study of mineralogy-petrology,the cosmic-ray exposure ages and gas retention ages of these two meteorites were determinated and calculated.Their cosmic-ray exposure ages are 33.3 Ma,51.7 Ma,and gas retention ages are 1936.8 Ma and 3720 Ma,respectively.The ureilite contains diamond,graphite and amorphous C,which are mainly carrier of noble gases indicating obviously shock metamorphism effects,which induced 40Ar partial loss.The H5 chondrite indicates thermal metamorphism of parent body,its gas retention age fall the range between 3220 Ma and 4510 Ma of the least shocked H5 chondrites 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献