电水准的参数测定   总被引：1，自引：1，他引：0  

王晓彬  铁琼仙 《天文研究与技术》1997,(Z1)

介绍了低纬子午环的水平差分两部分测定的要求和电水准的实际配置情况，分析了在这种配置中系统参数增多的原因，叙述了测定这些参数的方法，并提出在参数测定后如何保持系统状态的要求。  相似文献   

大震前沂沭断裂带定点水准的中、短期异常特征     

李杰 《大地测量与地球动力学》1992,(3)

采用滑动平均值、动态灰箱和带控制项自回归等方法对海城、唐山地震前后山东的定点水准观测资料做了处理。结果表明,长趋势正常背景下的中、短期异常达最大值,或者异常恢复过程中发震,并完成“∩”或“∪”型的变化过程,然后恢复到基值附近。分析结果还表明,安丘-莒县断裂与沂水-汤头断裂在两次大震前运动方式相反。  相似文献   

Future Satellite Gravimetry for Geodesy     

J. Flury  R. Rummel 《Earth, Moon, and Planets》2004,94(1-2):13-29

After GRACE and GOCE there will still be need and room for improvement of the knowledge (1) of the static gravity field at spatial scales between 40 km and 100 km, and (2) of the time varying gravity field at scales smaller than 500 km. This is shown based on the analysis of spectral signal power of various gravity field components and on the comparison with current knowledge and expected performance of GRACE and GOCE. Both, accuracy and resolution can be improved by future dedicated gravity satellite missions. For applications in geodesy, the spectral omission error due to the limited spatial resolution of a gravity satellite mission is a limiting factor. The recommended strategy is to extend as far as possible the spatial resolution of future missions, and to improve at the same time the modelling of the very small scale components using terrestrial gravity information and topographic models.We discuss the geodetic needs in improved gravity models in the areas of precise height systems, GNSS levelling, inertial navigation and precise orbit determination. Today global height systems with a 1 cm accuracy are required for sea level and ocean circulation studies. This can be achieved by a future satellite mission with higher spatial resolution in combination with improved local and regional gravity field modelling. A similar strategy could improve the very economic method of determination of physical heights by GNSS levelling from the decimeter to the centimeter level. In inertial vehicle navigation, in particular in sub-marine, aircraft and missile guidance, any improvement of global gravity field models would help to improve reliability and the radius of operation.  相似文献   

基于时序SAR影像的城市地面沉降速率获取研究     

张诗玉  谭继强  史红岭 《测绘与空间地理信息》2014,(12)

利用天津地区的2003年10月至2006年2月14幅ENVISAT/ASAR影像进行二轨差分干涉测量实验,选取相干性好、高程模糊度较大的9幅干涉图以叠加方法进行了时间序列分析,获取了地表年沉降速率,得出的地面沉降趋势与实地水准测量结果较为一致,两者较差绝对值小于6 mm,较差的标准偏差为±3.0 mm.  相似文献   

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郭良迁  陈聚忠  塔拉 《大地测量与地球动力学》2012,32(4):1-4

???????????????????????????????????????????α?????????????????????, ?о????????????????崹????????????????????????????α???????????????????????????????????????????????仯????ε?ò?????????????????????????????????????, ?????????????б??;????????????????????е???????????е???????е????????;????????????????1.00??2.00 mm/a??  相似文献   

水准测量网监测在德州市地面沉降中的应用          下载免费PDF全文

何国荣  冯在敏  冯克印  任翠爱  商婷婷  谭现锋 《山东国土资源》2012,28(6):28-30

山东地面沉降灾害以鲁北平原最为严重,在德州地区的地面沉降已对当地人民的正常生产和生活构成了威胁,并制约了当地经济的可持续发展。通过建立水准测量网络及监测运行,查明了德州市地面沉降的规模和范围,研究成果表明工作区均存在地面沉降现象,截至2010年,德城区由于地下水开采强度大,地面沉降幅度最大,目前地面累计沉降量为-1186.9～-636.9mm,多年平均沉降速率为59.35mm/a,形成了以市区西北部为中心的地面沉降盆地。超量开采深层地下水是造成大规模地面沉降的重要因素。  相似文献   

The Stability of Tide Gauges in the South Pacific Determined from Multiepoch Geodetic Levelling, 1992 to 2010     

Manoj Nilesh Deo  Ramesh Govind  Ahmed El-Mowafy 《Marine Geodesy》2013,36(3):261-284

Tide gauge data is important for determining global or local sea level rise with respect to a global geocentric reference frame. Data from repeated precise levelling connections between the tide gauges and a series of coastal and inland benchmarks, including Continuous GPS (CGPS) benchmarks, are used to determine the stability of tide gauges at 12 locations in the South Pacific. The method for determining this stability is based on a constant velocity model which minimises the net movement amongst a set of datum benchmarks surveyed since the installation of the tide gauges. When assessed at a 95% confidence interval, and with the exception of the Solomon Islands, none of the tide gauges were found to be in motion relative to their CGPS benchmarks. The Solomon Islands estimate is considered to be unreliable since the CGPS benchmark was recently established and has been surveyed fewer than three times. In Tonga and Cook Islands, the tide gauges were found to be disturbed or affected by survey errors whereas the Vanuatu results were affected by earthquakes.  相似文献   

海口市基础控制框架网和三等网的建立     

符永好  黄汉存  梁谋  韦积海 《地理空间信息》2004,2(5):36-38

为满足新海口市城市建设和基础测绘工作的需要,建立了GPS框架网、三等GPS网和三等水准网,取得了一大批较可靠的基础控制成果。  相似文献   

平坦与丘岭地区GPS工程水准的研究   总被引：1，自引：0，他引：1  

于来法  郑国宁 《测绘工程》1996,5(2):27-32

对ＧＰＳ工程水准网的布设、拟合法的模型选择和数据处理进行了探讨。通过实验网的布设和计算发现：在平坦和丘岭地区，控制面积不超出１００ｋｍ＾２时，按三等以上水准测量的精度联测网中６￣８个点，采用最佳三点平面拟合、二次多项式曲面拟合和ｈａｒｄｙ曲面拟合，求得ＧＰＳ工程水准高程的精度可达２￣４ｃｍ。  相似文献   

利用重力场模型和局部重力资料计算GPS水准高的精度探讨   总被引：2，自引：0，他引：2  

黄建业  谢军 《测绘工程》2001,10(4):27-29

利用大地水准面高，结合GPS测量的高程信息,直接计算GPS水准高，是一种全新诱人的解决方案。本文就这种方案，根据其核心技术－大地水面高的性质：长波长－全球重力场；中波长－局部重力资料，短波长－数据地形，对它的具体实现，适用范围以及精度分析作了详尽的探讨，在此基础上，提出一些GPS水准应用规范和要求，并利用实验数据对其进行验证。  相似文献