共查询到20条相似文献，搜索用时 578 毫秒
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A new solution of combination network of GPS and high precise distance measurements with EDM is proposed. Meanwhile, it's inadvisable only using GPS network without distance measurements. Three schemes: terrestrial network, GPS network and combination network are discussed for horizontal control network design of Xiangjiaba Dam in view of precision, reliability, coordinate and outlay in detail. 相似文献
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城镇控制测量中GPS高程拟合方法分析 总被引：1，自引：0，他引：1
结合扶余城镇控制测量成果对基于BP神经网络法进行GPS高程拟合进行了分析.与二次曲面拟合结果比较分析表明,通过施测少量均匀分布GPS点水准高程,采用BP神经网络方法计算GPS点正常高具有较高的精度,在生产中具有一定的应用价值. 相似文献
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利用GPS定位计算距离,通过采用辅助无线网络添加邻区的方法,提高添加邻区的合理性与有效性,对提升网络质量,提高工作效率,实现网络优化工作的高效能有着重要的作用。 相似文献
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This paper presents a data processing strategy for GPS kinematic Positioning by using a GPS active network to model the GPS errors in double difference observable.Firstly,the double difference residuals are estimated between the reference stations in the active network.Then the errors at a user station are predicted as the network corrctions to user measurements,based on the location of the user,Finally conventional kinematic positioning algorithms can be applied to determine the position of the user station.As an example,continuous 24-hour GPS data in March 2001 has been processed by this method.It clearly demonstrates that,after applying these corrections to a user within the network,both the success rate for ambiguity resolution and the positioning accuracy have been significantly improved. 相似文献
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GPS短边网精度的研究 总被引：2，自引：0，他引：2
《ＧＰＳ测量规范》规定了ＧＰＳ测量的等级及各级ＧＰＳ网相邻点间距离,最低级Ｅ级网相邻点间距为１～１０ｋｍ,平均边长为２～５ｋｍ。根据工程的要求,有时控制网相邻点间距仅为几十至几百米,文中针对ＧＰＳ短边网的数据处理和精度进行分析,并对ＧＰＳ网的质量检核进探讨,采用全站仪对网进行检核发现ＧＰＳ边长误差在５ｍｍ以内。 相似文献
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GPS平面控制网的模拟设计计算方法及其应用 总被引：4，自引：0，他引：4
基于全边角网和全边方位角网模拟法设计的计算思想和“科傻系统”中的控制网通用平差软件包 ,提出了一种GPS平面控制网的模拟设计计算方法 ,给出了该方法的计算步骤 ,并结合实例进行了计算分析 相似文献
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不同等级或者不同时期布设控制点都可能存在较大误差,如果以误差较大点做起算,都会扭曲GPS测量的精度,严重影响GPS成果可靠性。文中以某城市四等GPS控制网为例,探讨以城市CORS站分析GPS控制网起算点兼容性,并得到成功应用。 相似文献
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文章主要从GPS应用坐标网的建立和GPS在产生机理上的应用两个方面 ,论述了关于GPS应用理论问题。 相似文献
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Steffen Schön 《GPS Solutions》2007,11(2):107-117
GPS is a promising tool for real-time monitoring of deformations of slopes or large structures. However, remaining systematic
effects in GPS phase observations after double differencing and application of a priori models affect the resulting coordinates.
They complicate the proper separation of the actual deformations from pseudo-deformations induced by the systematic effects.
This paper shows that for small monitoring networks (baseline lengths <5 km) only affine distortions of the network geometry
are generated by the remaining distance dependent systematic effects, e.g. unmodelled tropospheric and ionospheric propagation
effects, or satellite orbit errors. Hence, a generic correction model is given by a three-dimensional affine transformation
involving a maximum of 12 transformation parameters. For the determination of these parameters, four high quality GPS stations
are necessary which are not affected by the actual deformations to be monitored. Based on the analysis of network geometries
of synthetic GPS networks with large height differences and considering the physics of the GPS observations it is shown, however,
that less than 12 parameters are sufficient for the computation of the corrections. The proposed 8 parameter model was applied
to the GPS monitoring network of the Gradenbach landslide. For this small network with large height differences, it was shown
that the distortions can be reduced by about 75%. 相似文献
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对GPS网采用全面边连式结构、点连式结构和导线网等三种不同网形进行平差分析,得出结果是：全面边连式GPS网形结构强,点位精度高,适用于高精度工程控制网。点连式GPS网网形结构的点位精度与全面边连式网的精度相当,但点连式GPS网可大大减少野外观测和计算工作量。在满足精度要求的情况下,优化GPS网的网形设计,可减少工作量,大大提高生产效率。 相似文献
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GPS网的模拟优化设计 总被引：4，自引：0，他引：4
对GPS网与常规控制网的优化设计进行比较与分析，给出了GPS网平差及优化设计的数学模型，并对一个实例采用模拟法对一，三阶段进行了优化设计，得出了一些结论。 相似文献
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基于GPS测量建立的施工测量控制网具有精度高、布网方便等优点,笔者根据国家高速公路杭州至瑞丽线湖南境内凤凰至大兴（湘黔界）段,一个特大桥——把总湾大桥工程GPS控制网的实际情况,阐述了GPS控制网设计、实施、数据处理方法及精度控制等,以便在今后的工作中进行参考。 相似文献