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工业测量中特高精度控制网的建立方法 总被引：17，自引：4，他引：13
冯文灏 《武汉测绘科技大学学报》1999,24(2):119-123
提出一种同时利用精密标准尺的长度精度和精密经纬仪的角度精度的方法,阐明建立此等控制网的理论与实际操作要点。此种方法还可用于一组ＧＰＳ接收机的精度检验。 相似文献
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提出了一种将精密单点定位计算的结果进行数据后处理的方法,该方法不但可提高精密单点定位计算结果的精度,还有效地解决了精密单点定位技术无法给出测站间相对精度的这一应用中的不足,可实现不同观测框架、不同观测历元基准下采用精密单点定位技术获得的成果基准的统一,具有一定的应用参考价值。 相似文献
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基于Fourier级数,阐述了GPS精密星历滑动式内插方法,对精密星历变化特点进行了分析。针对传统各类插值方法对于精密星历外推精度较差并考虑卫星实际运动的特点,采用了一种非常规插值方法 Fourier级数插值,并运用实际算例,将新插值方法和拉格朗日插值精度进行对比,得到结果说明,新插值方法优势明显,能够提高外推精度一个数量级。 相似文献
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TBC加载精密星历处理中短程基线分析 总被引：4，自引：0，他引：4
探讨利用商用GPS数据处理软件TBC加载精密星历的方法及数据处理流程,为中小型GPS控制网提高整网精度提供一种切实可行的方法。结合工程实例研究发现,TBC加载精密星历后其基线解算精度比采用广播星历有明显提高,但相对于科研软件GAMIT/GLOBK较弱。 相似文献
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《测量评论》2013,45(93):311-316
AbstractThe advantages of subtense measurements with a horizontal base are well known, but this method has not yet gained much popularity witH the ordinary surveyor and an acknowledgment of, its usefulness in cadastral and engineering surveys has not yet found a proper place. Everyone knows the difficulties of direct chaining in hilly and rough country or in industrial and mining districts where numerous obstructions are usually encountered and where reliable accuracy throughout the area under survey would be difficult to maintain. Adoption of the subtense bar in such circumstances is the best answer to the problem, and the establishment of control points by this method assures economy and reliability. The subtense bar is easy and direct in use and the precision of the results obtained are comparable with precise chaining. The use of an invar bar or a steel tubular bar is essential in precise traversing with an accuracy of 1/10,000 or greater, but for ordinary control. traverses with an accuracy up to 1/5,000 the wooden bar may be sufficient. 相似文献
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本文根据某特大型桥梁平面监测实际,提出了分段分级布设监测网的方案。在同时顾及精度、可靠性和工作量的情况下,利用机助法对直伸边角网进行了优化设计,提出了最优布网方案和观测方法。经过几年的观测实践证明,该设计方案是可行的,符合实际情况,满足了工程要求。 相似文献
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FENG Wenhao 《地球空间信息科学学报》2001,4(4):66-72
1 ＩｎｔｒｏｄｕｃｔｉｏｎＢｙｖｉｒｔｕｅｏｆｔｈｅｃｏｎｔｒｏｌｐｏｉｎｔｓａｎｄ/ｏｒｒｅｌａｔｉｖｅｃｏｎｔｒｏｌｗｏｒｋ ,ｔｈｅｍａｉｎｏｂｊｅｃｔｉｖｅｏｆｃｏｎｔｒｏｌｓｕｒｖｅｙ ｉｎｇｉｎｃｌｏｓｅｒａｎｇｅｐｈｏｔｏｇｒａｍｍｅｔｒｙｉｓｔｏｂｒｉｎｇｔｈｅｃｌｏｓｅｒａｎｇｅｐｈｏｔｏｇｒａｍｍｅｔｒｉｃｎｅｔｕｎｄｅｒｔｈｅｓｐｅｃｉ ｆｉｅｄｏｂｊｅｃｔｓｐａｃｅｃｏｏｒｄｉｎａｔｅｓｙｓｔｅｍ .Ｂｅｓｉｄｅｓｔｈｅｓｅ ｌｅｃｔｉｏｎｏｆｏｂｊｅｃｔｓｐａｃｅｃｏｏｒｄｉ… 相似文献
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In order to provide the model point accuracy of ±2 mm, an extra high accuracy industrial control net with four surveying piers with accuracy ±0.1 mm was set up around the model. Tens of orientation marks have been placed on the different parts and measured with accuracy ±0.2 mm from the above-mentioned piers. The main four stereopairs taken with the P31 camera around the model are simultaneously processed on the BC2 analytical plotter. The accuracy of absolute orientation is better than ±0.9 mm. Finally, about 300 sections construction drawings have been directly offered, and the closerange photogrammetric data has been used for the design and construction of the statue. 相似文献
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FENG Wenhao LI Xin JIANG Wanshou GAO Xinqiaoprofessor Ph.D supervisor School of Remote Sensing Information Engineering Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2002,5(3):58-64
1 ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｇｒｅａｔＫｗａｎ＿ｙｉｎＳｔａｔｕｅｗｉｔｈａｈｅｉｇｈｔｏｆ 61 .9ｍｉｎＸｉｑｉａｏＭｏｕｎｔａｉｎ,Ｎａｎｈａｉ,Ｇｕａｎｇｄｏｎｇ ｐｒｏｖｉｎｃｅｉｓｔｈｅｈｉｇｈｅｓｔｓｉｔｔｉｎｇｓｔａｔｕｅｉｎｔｈｅｗｏｒｌｄ .ＳｅｅｎｆｒｏｍＦｉｇ .1 ,ｔｈｅｓｔａｔｕｅｓｕｒｆａｃｅｉｓｆｏｒｇｅｄｗｉｔｈ 3ｍｍ＿ｔｈｉｃｋｃｏｐｐｅｒｓｈｅｅｔｓ.Ｔｈｅｓｔａｔｕｅｉｓｓｕｐｐｏｒｔｅｄｗｉｔｈｐｒｅｃｉｓｅａｎｄｒａｔｉｏｎａｌｓｔｅｅｌｓｔｒｕｃｔｕｒｅｆｒ… 相似文献
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介绍了平面控制网精度评估的原理,并以佛山市某体育馆变形观测平面控制网设计方案之一为例,对控制网的布设要求、设计数据的组织方法、用MATLAB语言实现精度评估的方法做了详细阐述。就平面控制测量优化设计的实现方法做了一些新尝试,对于高精度变形观测平面控制网的优化设计具有一定的参考价值。 相似文献
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Feng Wenhao 《地球空间信息科学学报》2013,16(4):66-72
The purpose, classification, required accuracy and surveying methods of control work for close range photogrammetry have been briefly stated. The different methods for definition of space, object coordinate system are also reviewed. It is suggested that the habitu-ally-practised rotation angle system for aerophotogrammetry in China should be used for the future teaching and resaarching work in the close range photogrammetry, and that the rotation angle system for terrestrial deformation photogrammetry should be left out in order to avoid the confuse and reduce the amount of expanse for making softwares. It has been emphasized that there are three improtant aspects in the close range control work with high accurary using the conventional method of engineering surveying: the use of standard scale for measurement of distance between two general stations, the accurate determination of start direction line between two general stations and the handling method of influence of 2C change. A method for setting up industrial surveying control net with extra-high accuracy ±(0.05–0.20) mm is presented by the author. This kind of industrial control net is necessary for batch process of large industrial components with purposes of measurement, inspect and lofting. There are some special methods of control work in the close range photogrammetry, including two methods presented by the author. 相似文献
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基于广播星历的单站载波相位授时算法 总被引：1，自引：0，他引：1
针对传统单站授时算法的局限性,提出了一种基于广播星历的单站载波相位授时算法。该算法在标准单点定位授时算法仅采用伪距观测量的基础上,增加了载波相位观测量,授时精度得到了显著改善;该算法与精密单点定位授时算法相比,不需要精密轨道和钟差,摆脱了IGS等外部事后精密星历产品的依赖,能够广泛应用于实时授时。并利用IGS站观测数据进行实验分析,结果表明,单站载波相位授时精度明显优于标准单点定位授时算法,授时精度可达1~2 ns。 相似文献