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变形监测中GPS信号衍射误差的环境建模法 总被引:1,自引:0,他引:1
信号衍射是GPS结构变形监测的重要误差源之一.GPS天线周围的建筑物是常见的信号衍射体.针对在变形监测中观测环境相对固定之特点,提出一种基于环境模型的衍射误差建模算法.若干试验表明所提方法能有效检测并削弱衍射误差对变形监测结果的影响. 相似文献
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GPS全球定位系统是随着现代科技发展而建立起来的高精密卫星导航定位系统。GPS测量具有很多传统测量方式所不具备的优点,如无须通视、高精度、全天候、操作简便、自动化高等,因此GPS测量可以极大地提高生产效率。水准测量是GPS应用的一个重要方面,用水准拟合方法将GPS测量所得到的大地高转化为我国所通用的正常高已经成为我国GPS研究的重要方面。本文通过实验来比较GPS水准不同的拟合方法和拟合点的分布对GPS水准面拟合精度的影响。 相似文献
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In this article, the architecture of a software Global Positioning System (GPS) receiver is described and an analysis is included
of the performance of a software GPS receiver when tracking the GPS signals in challenging environments. Results are included
that demonstrate the advantage of the software GPS receiver in tracking the GPS signals in low signal-to-noise or jamming
scenarios. Various current and previous applications of the software GPS receiver are also described. ? 2000 John Wiley &
Sons, Inc. 相似文献
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LIU Jiyu CHEN Xiaoming 《地球空间信息科学学报》2000,3(1):50-56
l lntroductionIn the winter Of l989 Wuhan Technical Universi-ty of Surveying and Mapping COntracted withTrimble Navigation Ltd. to purchase fOur TrimbIe4000SST receivers. They were required tO suit theaeriaI phWetric work without intreducing avelocity limitation. In February, l993 twO of thereceivers were uPgraded to provide two eventrnarker plugfords and one pulse Per second(lPPS) output axkets. The uPgradd receivers canincormrate external event markers, e. g. the shutter.oPening … 相似文献
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高斯平面上GPS工程网数据处理 总被引:2,自引:0,他引:2
结合工程控制网的特点,给出高斯平面上GPS工程网数据处理的数学模型,对提高网的精度进行探讨,编写的软件对某GPS工程网进行数据处理与分析。 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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GPS网平差观测量选取的理论分析 总被引:1,自引:0,他引:1
由多台GPS接收机在不同时段进行静态观测而组成的观测网形,当采用高精度的科研软件与常用商用软件解算基线时,其基线向量的方差阵不同,前者的方差阵结构是完全的、严密的。同时,在进行GPS网平差时,选取GPS基线的方式及数量的不同,构造的网形也就不同,采用不同的数学模型其得到的平差结果和精度指标也不相同。文章先从理论上进行分析,后用示例进行比较论证。 相似文献
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GPS seismology 总被引:6,自引:0,他引:6
Kristine M. Larson 《Journal of Geodesy》2009,83(3-4):227-233
GPS seismology uses convential geodetic models to analyze GPS data at high sampling rates, such as 1 Hz. GPS seismology results are shown for the Denali, San Simeon, Tokachi-oki, and Chuetsu earthquakes. Records for these earthquakes indicate that GPS is an excellent instrument for measuring large displacements near earthquake ruptures. GPS systems can be improved for seismic applications if their sampling rates are increased from 1 to 10 Hz. 相似文献
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利用GPS技术建立城市GPS控制网的方法探讨 总被引:1,自引:0,他引:1
笔者结合多年生产经验,以海南省乐东县GPS控制网为例,介绍了利用GPS技术建立城市GPS控制网时一些常见的问题及处理办法。通过全面的质量控制以确保城市D级GPS控制网测量成果符合现行测量规范的要求,讨论了GPS控制测量的精度等问题。 相似文献
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王珍 《测绘与空间地理信息》2015,(3):121-124
分析GPS网三维无约束平差和二维约束平差的理论模型,根据GPS网三维无约束平差和二维约束平差的特性,对地铁5号线GPS网平差结果和交叉线路的GPS控制点较差进行了对比分析,并给出地铁5号线与交叉线路平面控制衔接的合理解决方案。 相似文献
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论电离层对GPS定位的影响 总被引:13,自引:2,他引:11
电离层是GPS定位的主要误差源。本文论述电离层的特征和折射系数,以及电离层的下列影响:电离层码群延、电离层载波相位超前、电离层多普勒频移、振幅闪烁、电离层相位闪烁效应、磁暴对GPS定位测量的影响、电离层对差分GPS的影响和GPS接收机的电离层改正。 相似文献
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Ionospheric activity is a significant concern for reliable operation of GPS positioning applications, particularly at high latitudes. In order to monitor high latitude ionospheric activity for GPS users, researchers at the University of Calgary have installed the Canadian GPS Network for Ionosphere Monitoring (CANGIM). This network has been operational since 2003 and consists of a number of reference stations, each equipped with a specialized GPS receiver capable of providing near real-time observations of ionospheric parameters and raw GPS data. Potential exists to provide ionospheric warnings and near real-time measures of associated impacts on positioning and navigation applications for GPS users. This paper provides an overview of ionospheric limitations for high latitude GPS users, and describes the ionospheric monitoring services developed for the CANGIM. 相似文献
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冯海波;韩冰;梁宏伟;张元杰 《东北测绘》2013,(4):101-102,105
由于似大地水准面是一个不规则的曲面,它无法用一个精准的曲面来模拟,这就使得GPS只能提供给我们高精度的大地高,而不是工程中需要的正常高,严重影响了GPS3维定位的应用发展,使其提供维坐标的优越性未能得到充分发挥。在借鉴国内外研究成果的基础上,针对我国国土面积广,地形尤为复杂,似大地水准面起伏比较大的特点,结合工程实例,对大面积区域内GPS高程异常拟合作了相应的分析和研究。 相似文献
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夏朝娟 《测绘与空间地理信息》2011,(6):121-123
GPS是一种全天候、高精度的连续定位系统,并且具有定位速度快、费用低、方法灵活多样和操作简便等特点,所以它在测量学、导航学及其相关学科领域,获得了极其广泛的应用。本文将以上海浦东新区某地块面积测量项目为例,概略叙述GPS在工程测量中的前期应用实例,并且将运用GPS得到的引测点对浦东地块进行面积测量。最后指出了GPS技术... 相似文献
19.
Stefania Bonafoni Augusto Mazzoni Domenico Cimini Mario Montopoli Nazzareno Pierdicca Patrizia Basili Piero Ciotti Giovanni Carlesimo 《GPS Solutions》2013,17(4):475-484
We present an assessment of a GPS receiver operational network to produce accurate integrated precipitable water vapour (IPWV) during a two-week field experiment carried out in Central Italy around the city of Rome, where different instruments were operative. This experimental activity provided an excellent opportunity to compare the GPS products with independent measurements provided by ground-based and space-based sensors and to evaluate their quality in terms of absolute accuracy of IPWV, analyzing also the spatial scale of GPS estimates. For instance, the assimilation into Numerical Weather Prediction models of IPWV provided by a GPS network or its exploitation in space geodesy applications to correct tropospheric effects requires an accuracy in the order of 0.1 cm to be ascribed to IPWV observations. In this work, we assessed that the accuracy for GPS IPWV estimates is 0.07 cm. Moreover, this experiment has pointed out strengths and limitations of an operational network for the water vapor estimation, such as a proper receiver distribution to achieve the desired spatial resolution and a coverage of GPS stations in both flat and mountains regions. 相似文献
20.
目前我国北斗导航系统已经完成第二阶段区域系统的建设,利用北斗导航定位技术进行桥梁变形监测是今后发展的必然趋势。本文分析了北斗定位技术在桥梁变形监测中的的优势,并与GPS定位技术作对比分析,结果表明:在监测区域内,北斗二号的可见卫星数要略多于GPS可见卫星数,卫星几何精度因子略低于GPS,数据质量与GPS相当,相对定位精度略优于GPS,平面定位精度在1~2 cm,水平定位精度在5~6 cm。 相似文献