Impact Of Tec Fluctuations In The Antarctic Ionosphere On Gps Positioning
Impact Of Tec Fluctuations In The Antarctic Ionosphere On Gps Positioning
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DOI：
10.2478/v10018-007-0005-5
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Krankowski;I. Shagimuratov
中科院分区：
文献类型：
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作者：
A. Krankowski;I. Shagimuratov
南极电离层TEC波动对GPS定位的影响随着全球导航和通信对天基平台的依赖日益增加，对电离层闪烁和总电子含量波动对这些系统的影响的关注已成为高度优先事项。本文利用GPS跨电离层信号研究了2001年在南极IGS常设站McMurdo-MCM 4、Casey-CAS 1、Mawson-MAW 1、Sanae-VESL、Syowa-SYOG和Davis-DAV 1观测到的电离层相位起伏的发展。利用全球定位系统信标的多站、多路径观测，可以研究不规则性随个别地磁暴经纬度变化的时间发展情况。研究的基本风暴是2001年3月19日至20日、3月31日、4月9日至11日、6月16日至17日和9月23日的风暴。TEC的速率（ROT）参数被用来研究TEC波动的发生。研究这些风暴的结果显示了每一场风暴的独特性质。对于上述5个风暴，可从三个极光站（VESL，SYOG和MAW 1）和61°至70°校正地磁纬度（CGL）获得数据。此外，还分析了800 CGL附近三个高纬度极地站（DAV 1、MCM 4和CAS 1）的资料。波动效应会引起总电子含量（TEC）的剧烈变化，对GPS定位精度（特别是在相位模糊度解算期间）会产生不同的影响。Bernese ver.4.2软件用于分析南极IGS站的GPS永久数据。分析依赖于研究矢量坐标的重复性。这些矢量进行了研究，在磁暴时，TEC波动的强度更明显。从双差观测值总数和模糊度总数与未解模糊度之比两个方面讨论了高纬电离层TEC波动对GPS定位精度的影响。
Impact Of Tec Fluctuations In The Antarctic Ionosphere On Gps Positioning With increasing reliance on space-based platforms for global navigation and communication, concerns about the impact of ionospheric scintillation and total electron content fluctuations on these systems have became a high priority. In this paper, GPS transionospheric signals have been used to study the development of ionospheric phase fluctuations observed at Antarctic IGS permanent stations: McMurdo-MCM4, Casey-CAS1, Mawson-MAW1, Sanae-VESL, Syowa-SYOG and Davis-DAV1 in 2001. The use of the multi-station, multi-path observations of the GPS beacons has allowed the study of the time development of irregularities as a function of latitude and longitude of individual geomagnetic storms. The basic storms studied were those of March 19-20, March 31, April 9-11, June 16-17, and September 23, 2001. The rate of TEC (ROT) parameter was used to study the occurrence of TEC fluctuations. The results from studying these storms showed the unique nature of each storm. For the above five storms, data were available from three auroral stations (VESL, SYOG and MAW1) and from 61° to 70° Corrected Geomagnetic Latitude (CGL). In addition, data from three higher latitude polar stations (DAV1, MCM4 and CAS1) near 800 CGL are also analysed. Fluctuation effects, causing dramatic changes in total electron content - TEC, can have a different impact on GPS positioning accuracy (especially during phase ambiguity resolution). Bernese ver.4.2 software was used for the analysis of the GPS permanent data from Antarctic IGS stations. The analyses rely on studying the repeatability of vector co-ordinates. These vectors were investigated during the geomagnetic storms when the intensity of TEC fluctuations was more pronounced. The impact of TEC fluctuations in the high latitude ionosphere on GPS positioning accuracy has been discussed in terms of the total number of observations of doubledifferences (DD) and in the ratio of the total number of all ambiguities to unresolved ones.