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本文通过在原有GPS网上使用南方GPS接收机布设GPS网进行观测 ,同时以武汉测绘科技大学GPS处理软件与南方GPS处理软件分别进行计算与平差 ,在资料分析比较的基础上 ,对南方GPS软硬件的优缺点提出了自己的见解和看法。 相似文献
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小波分析技术在GPS动态测量数据处理中的应用 总被引:1,自引:0,他引:1
目前,小波分析技术已经广泛应用于数据处理、图象处理、语音识别与合成、天体识别,机器视觉、故障诊断与监控等诸多科技领域。在GPS动态测量中,由于在数据的采集和处理过程中存在一些偶然性的误差,这些误差会在一定程度影响测量结果的精度。因此,怎样有效地剔除这些误差以提高测量的精度和可靠性就成为一个不可回避的问题。针对这个问题,本文基于动态测量平台用两台NovAtel DL-4 plus GPS接收机设计了双动态测量实验。利用GrafMov数据处理软件对采集的GPS数据进行了解算,对解算的结果利用小波分析技术进行了降噪处理,求得了其噪声信号分布和特性,并对该噪声对测量结果的影响进行了评估分析。 相似文献
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介绍GPS天线阵列接收机产生的背景,简述GPS天线阵列接收机的工作原理和系统的组成,包括PDA控制系统、GPS信号放大器、无线传输系统。重点论述配套的处理软件和在线灾害监测分析系统,指出该接收机及其配套软件具有成本低廉、实用性强、安全性高、预测模型先进等优点,展望了其在灾害监测方面很好的市场推广前景。 相似文献
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多传感器与道路网数据用于汽车导航的研究 总被引:4,自引:0,他引:4
对车载导航系统中GPS接收机,车论计数器和电子罗盘传感器数据与导航电子地图所提供的道路网络数据进行了综合处理,建立了道路网络数据的网络拓扑关系,在此基础上提出了基于道路网络拓扑关系,利用GPS接收机,车轮计数器和电子罗盘传感器对汽车进行实时定位的算法。最后,对导航中汽车的定位误差进行了分析。实验证明,GPS接收机,车轮计数器和电子罗盘传感器与道路网络数据综合,在导航过程中能够补偿GPS信号技失,实时、高精度、高可靠性地确定汽车的位置。 相似文献
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将几种商用的GPS数据处理软件在功能、性能、数学模型、基线处理和网平差结果等方面进行了分析比较,对工程人员选择不同的GPS数据处理软件提供参考. 相似文献
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本文给出了GPS/GLONASS双模接收机的总体设计方案,重点对弱信号环境下的接收机信号捕获进行了讨论,采用并行码相位搜索方法和改进的循环相关算法分别对GLONASS信号和GPS信号进行捕获;并利用真实数据对双模接收机性能进行了仿真研究,重点对接收机捕获弱信号的能力,以及在不同信噪比和不同累加数据长度下的捕获概率进行了讨论,结果表明该双模接收机在不需要较长数据长度的情况下能够捕获低信噪比环境下的卫星导航信号,提高了接收机的灵敏度。 相似文献
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The geodetic-geodynamic network (G1) was established with the intention of monitoring recent crustal deformation and serving as the major control network in Israel. In 1996 the network was measured for the first time using GPS. This paper presents the second GPS measurement campaign of the G1 network, held in 2002. It presents the network configuration design and the data processing procedures by commercial and scientific post-processing GPS software, as well as a comparison of the results. Long session duration and medium vector length with strict analysis by the commercial GPS processing software TTC (Trimble Total Control) were found to achieve results that are equivalent to those obtained when using the BERNESE scientific software. 相似文献
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A GPS IF signal computer simulation method is proposed in this article. The carrier Doppler frequency and the total propagation
and delay time can be modeled or calculated with the input GPS satellite ephemeris file. The simulated GPS IF signal outputs
to a text file for post-processing and analysis. The simulation signal spectrum is compared with the received real GPS IF
signal spectrum, and the correctness of the simulation result is verified.
Supported by the Research Fund (2008–2009) of State Key Laboratory of Information Engineering in Surveying, Mapping and Remote
Sensing, the National 863 Program of China (No.2008AA12Z308). 相似文献
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由于受网络信号和基线长度限制,在南北极、远岸岛礁等地区,常用的GPS RTK技术无法应用于无人机航空摄影测量,且GPS并非我国自主的卫星导航系统,无法确保永久安全可靠。为此,本文探索利用我国自主建设的北斗三号全球卫星导航系统(BDS-3),通过动态后处理(PPK)技术辅助无人机摄影测量,以解决上述问题。以大疆精灵4 RTK无人机为例,分别利用BDS-3、GPS及BDS-3+GPS组合观测值,对无人机POS数据进行PPK处理,分析在无地面控制点条件下,不同导航卫星星源对无人机航空摄影测量平面和高程精度的影响。结果表明:利用BDS、GPS、BDS+GPS组合对无人机单点定位POS数据进行PPK处理后,空三加密点平面定位精度由分米级提升至厘米级,高程精度由米级提升至分米级甚至厘米级,与引入5个地面控制点的定位精度相当。北斗PPK技术辅助无人机航空摄影测量满足平原地区1:500比例尺空中三角测量加密精度要求。 相似文献
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本文分析了GPS现代化信号L5载波的结构及相对于非现代化信号的改进,比较了GPS L5载波和WAAS L5载波的区别;比较了2颗现代化卫星SVN49和SVN62播发的L5载波的信号结构及信噪比,结果表明:SVN49播发的L5载波演示信号的抗干扰能力较差,而SVN62播发的L5载波具有更强的抗干扰能力,满足设计规范要求。 相似文献
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Analyzing GNSS data in precise point positioning software 总被引:4,自引:1,他引:3
This work demonstrates that precise point positioning (PPP) can be used not only for positioning, but for a variety of other
tasks, such as signal analysis. The fact that the observation model used for accurate error modeling has to take into consideration
the several effects present in GPS signals, and that observations are undifferenced, makes PPP a powerful data analysis tool
sensitive to a variety of parameters. The PPP application developed at the University of New Brunswick, which is called GAPS
(GPS Analysis and Positioning Software), has been designed and built in order to take advantage of available precise products,
resulting in a data analysis tool for determining parameters in addition to position, receiver clock error, and neutral atmosphere
delay. These other estimated parameters include ionospheric delays, code biases, satellite clock errors, and code multipath
among others. In all cases, the procedures were developed in order to be suitable for real-time as well as post-processing
applications. One of the main accomplishments in the development described here is the use of very precise satellite products,
coupled with a very complete observation error modeling to make possible a variety of analyses based on GPS data. In this
paper, several procedures are described, their innovative aspects are pointed out, and their results are analyzed and compared
with other sources. The procedures and software are readily adaptable for using data from other global navigation satellite
systems. 相似文献