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电离层闪烁是引起GNSS接收机性能降低甚至失锁的重要环境干扰因素。利用实测数据,比较分析了不同电离层闪烁活动强度下,不同GNSS系统(BD和GPS)接收机的定位性能。结果表明:电离层闪烁较弱时(S4〈0.3),两种接收机均可以实现基本的定位功能;电离层闪烁较强(S4〉0.7),且持续时间较长时,不同GNSS接收机将出现定位结果的抖动、跳变或失去定位能力;GNSS接收机应对电离层闪烁影响的能力与接收机设计相关。研究结果可作为抗闪烁接收机开发或闪烁影响分级的参考。 相似文献
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GAMIT/GLOBK是全球应用最广泛的高精度GPS数据处理软件之一,不仅在高精度定位方面得到应用,而且在全球地壳板块运动监测、电离层监测和GPS气象学等领域也得到广泛应用。本文介绍了在Windows7系统下实现Ubunru Kylin16.04桌面版系统的安装,并在Ubuntu Kylin系统平台下安装、更新最新版GAMIT/GLOBK10.60,并利用中国及其周边IGS站观测数据进行基线解算和网平差,验证了软件安装的正确性。 相似文献
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电离层闪烁是影响卫星导航系统定位性能的重要因素之一。电离层闪烁可造成GNSS载噪比降低,测量误差增大,载波周跳次数增多,电离层修正精度降低,定位用精度因子变大等影响。中国南方区域是全球电离层闪烁多发区之一,电离层闪烁影响的时空范围和程度较大,是我国卫星导航应用应关注的问题。针对电离层闪烁影响,提出了我国卫星导航系统应用中可行的针对性减缓措施。 相似文献
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卫星导航局域增强系统采用差分技术实现高精度定位能力。电离层扰动现象将对局域增强系统产生严重影响。电离层暴降低了电离层延迟空间相关性,进而影响差分定位的精度;电离层闪烁引起卫星信号质量和测量质量的降低,同时伴随闪烁产生的电离层电子密度不均匀体也会降低电离层延迟的空间相关性,影响差分定位精度。电离层扰动对局域增强系统的影响应通过接收机设计、增强系统设计、完好性实现方法等多方面的改进加以应对。 相似文献
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A. J. Van Dierendonck 《GPS Solutions》1999,2(4):60-63
From time to time, this column will include short contributions from invited guest contributors on specialized subjects pertaining
to inonospheric effects on GPS signals. In this issue, Dr. A. J. Van Dierendonck discusses the required specifications of
a civilian GPS receiver specially designed to make quantitative measurements of both ionospheric amplitude and carrier phase
scintillation effects from GPS signals. ? 1999 John Wiley & Sons, Inc. 相似文献
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Correlation between ROTI and Ionospheric Scintillation Indices using Hong Kong low-latitude GPS data
The correlation between the rate of TEC index (ROTI) and scintillation indices S 4 and σ Φ for low-latitude region is analyzed in this study, using data collected from a Global Positioning System (GPS) scintillation monitoring receiver installed at the south of Hong Kong for the periods June–August of 2012 and May 2013 and July–December of 2013. The analysis indicates that the correlation coefficient between ROTI and S 4/σ Φ is about 0.6 if data from all GPS satellites are used together. If each individual satellite is considered, the correlation coefficients are above 0.6 on average and sometimes above 0.8. The analysis also shows that the ratio of ROTI and S 4 varies between 1 and 4. The ratio ROTI/σ Φ, varies between 2 and 9. In addition, it is also found that there is a good consistency between the temporal variations of ROTI with scintillation activity under different ionospheric conditions. ROTI has a high correlation relationship with scintillation indices on geomagnetically disturbed days or in solar active months. Moreover, the data observed at low elevation angles have weak correlation between ROTI and scintillation indices. These results demonstrate the feasibility of using ROTI derived from GPS observations recorded by common non-scintillation GPS receivers to characterize ionospheric scintillations. 相似文献