| 电离层延迟高阶项对GPS精密单点定位精度影响分析 |
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| 引用本文： | 秦姗兰,王文萍,庄文泉.电离层延迟高阶项对GPS精密单点定位精度影响分析[J].全球定位系统,2017,42(5):33-38. |
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| 作者姓名： | 秦姗兰 王文萍 庄文泉 |
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| 作者单位： | 中国地震局第二监测中心,陕西 西安 710054 |
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| 摘 要： | 随着GPS卫星轨道、钟差及各种误差修正模型的不断精化,静态精密单点定位(PPP)定位精度达到mm级,进行电离层延迟高阶项较小量级的误差改正研究,对改进PPP数据处理策略具有重要的参考价值。本文利用分布在不同地理纬度的5个IGS跟踪站3天的观测数据,对比分析了电离层延迟二阶项、三阶项对GPS观测值精度及静态PPP定位精度的影响。分析结果表明,电离层延迟二阶项、三阶项对GPS观测值精度的影响分别为cm级和mm级,对低纬度地区PPP定位精度的影响大于3 mm,但对中高纬度的测站观测值、定位精度的影响比低纬度地区小很多。
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| 关 键 词： | 电离层延迟高阶项 精密单点定位 精度 |
An Influence Analysis of High-order Ionosphere on GPS Precise Point Positioning |
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| Affiliation: | Second Monitoring and Application Center, China Earthquake Administration, Xi′an?710054, China |
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| Abstract: | With the continuous refinement of GPS satellite orbit, clock error and various error correction models, carrying out the study on the high order ionospheric error correction of static Precision Point Position (PPP), which has an important reference value for improving the processing strategy of PPP observations. The influence degree of high order ionospheric error on the accuracy of GPS observations and static PPP is analyzed and compared, using the observations from 5 IGS tracking stations, during January 7-9, 2013. The results show that: 1) the influence of the second-order and the third-order of the ionospheric error on the accuracy of GPS observation are cm level and mm level, respectively; 2) the influence of the high-order ionospheric error on the accuracy of GPS PPP is more than 3 mm in low latitude. But the influence degree on the accuracy of the observations and PPP in middle and high latitudes is much smaller than that in low latitudes. |
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