共查询到17条相似文献，搜索用时 874 毫秒
1.
2.
IGS测站的非线性变化研究 总被引：1，自引：0，他引：1
基于坐标模式的广义网平差模型，利用IGS发布的对GPS全球站处理后形成的单天解SINEX文件，通过自编软件计算了IGS测站的时间序列，并发现IGS测站存在非线性变化。利用频谱分析方法得出了IGS测站存在年周期或半年周期的变化，同时利用经验模型建立了IGS测站的测站速度函数。指出了仅利用1个线性量估计IGS跟踪站的速度值会存在偏差，应建立周期性变化模型，或采用分段线性化的方法，每隔一定的时间给出1个对应的速度。 相似文献
3.
华北GPS网GAMIT计算结果与IGS站选取的关系探讨 总被引：3，自引：0，他引：3
利用GAMIT软件对1999年华北GPS网的观测数据进行了处理，在处理过程中，对IGS站的选取分为：（1）选取15个IGS站；（2）选取6个IGS站；（3）选取3个IGS站；（4）对不选IGS站的四种情况进行了计算，并对四种情况得出的结果从基线向量、测站坐标、基线的重复率和计算所得的均方根的残差nrms四个方面进行了比较，得出了以下结论：使用GAMIT软件处理GPS资料时，最好选取IGS站为区域网提供参考框架；IGS站的选取，数量上不一定最多，但空间分布上应尽量均匀；对华北GPS网，选取6个左右的IGS站即可；多期GPS资料在处理时应尽量选取相同的IGS站进行计算。 相似文献
4.
5.
6.
IGS基准站的选取问题是目前GPS数据处理中讨论的热点问题.文中从基准站选取的几何意义、统计意义和物理意义3个方面分析讨论了IGS基准站的选取问题.并通过对理论及大量算例的分析,提出了IGS基准站选取的一般原则. 相似文献
7.
本文针对江苏连续运行参考站网(以下简称江苏CORS)数据处理中IGS基准站的选取问题,简要介绍了数据处理软件GAMIT,探讨了选取IGS基准站的方位分布对基线解算结果U方向的影响以及IGS站数量的选取对江苏CORS网解算精度的影响.通过实验证明,在本文给出的GAMIT解算策略下,选择北半球较高纬度的IGS基准站与江苏C... 相似文献
8.
GPS数据处理中IGS基准站的选取 总被引：7，自引：0，他引：7
IGS基准站的选取问题是目前GPS数据处理中讨论的热点问题。文中从基准站选取的几何意义、统计意义和物理意义3个方面分析讨论了IGS基准站的选取问题。并通过对理论及大量算例的分析，提出了IGS基准站选取的一般原则。 相似文献
9.
10.
针对随机模型对站速度的影响,该文以45个国际GNSS服务(IGS)核心站坐标时间序列为研究对象,提出基于Fisher信息矩阵的KIC噪声模型估计准则,对WN、PL、FN+WN、FN+RW、FN+WN+RW备选随机模型进行分析。探讨不同随机模型对IGS站速度及其不确定度估计的影响。结果表明,IGS站坐标时间序列随机模型呈现出多样性,在进行噪声模型估计及其速度应用时应选择足够代表IGS随机模型的备选噪声模型。不同随机模型对IGS站速度估计值的相对影响较小,但对速度不确定度估计值影响不可忽略,尤其是RW分量对站速度不确定度的影响更加明显。 相似文献
11.
YAO Yibin 《地球空间信息科学学报》2007,10(4):240-244
With the daily SINEX files of the IGS, the time series of IGS stations are obtained using an independently developed software under generalized network adjustment models with coordinate patterns. From ... 相似文献
12.
Haitao Wang Hu Jiang Jikun Ou Baoqi Sun Shiming Zhong Min Song Aizhi Guo 《GPS Solutions》2018,22(4):124
The merged GPS navigation files from the International GNSS Service (IGS) data centers, i.e., the Crustal Dynamics Data Information System (CDDIS), the Bundesamt für Kartographie und Geodäsie (BKG), the Scripps Institution of Oceanography (SIO), and the Institut Geographique National (IGN) are occasionally contaminated by anomalies and inconsistent user range accuracy (URA). This contamination impairs the performance assessment of GPS service, especially the system integrity. We remerged these files starting Day of Year (DOY) 1, 2000 using all available navigation data files from IGS stations. To effectively get the upper bound URA, a frequency-dependent pattern recognition method was developed. In addition, a comprehensive comparison between the navigation data remerged by us and those provided by the four IGS data centers was performed. The compared results revealed that TGD and Issue of Data Clock (IODC) were the dominating anomalies in the merged navigation data from CDDIS and SIO for the first several years after 2000, and M0, Ω0, ω, and af0 were the dominant anomalies in the merged data from IGN. In addition to a number of missing records, many records with incorrect PRN (pseudo-random noise number), identifying a GPS satellite, were found in files from the IGS data centers. Although the number of anomalies in the merged files from CDDIS has continued to decrease in recent years, they have not disappeared and would affect system-level assessment and scientific applications to a certain extent. The results also revealed that our remerged files were more complete, clean, compact and consistent, making them more suitable for GPS system performance assessment and related research studies. Moreover, those data are now openly available. 相似文献
13.
14.
主要探讨了基于SINEX的BERNESE和GAMIT/GLOBK的联合数据处理流程。选取东北地区的中国大陆构造环境监测网络(陆态网络)GNSS连续运行基准站和周边IGS跟踪站组成区域网,利用GAMIT进行区域网基线解算。在BERNESE ADDNEQ框架下实现全球统一网平差,利用3种方法综合验证解算精度,并达到毫米级,为大规模GNSS控制网联合数据处理提供了一套切实可行的解决方案。 相似文献
15.
基于PANDA软件的实时精密单点定位研究 总被引：7，自引：0，他引：7
基于PANDA软件，研究了全球以及中国境内实施实时精密单点定位的模式及可行性。实际数据分析结果显示，采用IGS中心提供的超快速预报星历（Ultra—BRD），利用全球40个左右均匀分布的IGS站实时数据，PANDA软件实现了10～20cm精度的实时精密单点定位；国内仅需6～7个测站的实时观测数据，PANDA软件就可以提供全国范围精度为10～20cm的实时精密单点定位服务。 相似文献
16.
17.
IGS08: the IGS realization of ITRF2008 总被引：22，自引：6，他引：16
P. Rebischung J. Griffiths J. Ray R. Schmid X. Collilieux B. Garayt 《GPS Solutions》2012,16(4):483-494
On April 17, 2011, the International GNSS Service (IGS) stopped using the IGS05 reference frame and adopted a new one, called IGS08, as the basis of its products. The latter was derived from the latest release of the International Terrestrial Reference Frame (ITRF2008). However, the simultaneous adoption of a new set of antenna phase center calibrations by the IGS required slight adaptations of ITRF2008 positions for 65 of the 232 IGS08 stations. The impact of the switch from IGS05 to IGS08 on GNSS station coordinates was twofold: in addition to a global transformation due to the frame change from ITRF2005 to ITRF2008, many station coordinates underwent small shifts due to antenna calibration updates, which need to be accounted for in any comparison or alignment of an IGS05-consistent solution to IGS08. Because the heterogeneous distribution of the IGS08 network makes it sub-optimal for the alignment of global frames, a smaller well-distributed sub-network was additionally designed and designated as the IGS08 core network. Only 2?months after their implementation, both the full IGS08 network and the IGS08 core network already strongly suffer from the loss of many reference stations. To avoid a future crisis situation, updates of IGS08 will certainly have to be considered before the next ITRF release. 相似文献