| 三种电离层延迟多频修正算法的比较 |
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| 引用本文： | 王梦丽,王飞雪.三种电离层延迟多频修正算法的比较[J].测绘科学,2008,33(4). |
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| 作者姓名： | 王梦丽 王飞雪 |
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| 作者单位： | 国防科学技术大学电子科学与工程学院卫星导航研发中心,长沙,410073;国防科学技术大学电子科学与工程学院卫星导航研发中心,长沙,410073 |
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| 基金项目： | 新世纪优秀人才支持计划 |
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| 摘 要： | 电离层延迟多频修正算法在修正电离层延迟的同时会放大观测噪声等伪距误差的影响。分析了电离层延迟双频修正、三频一阶修正和三频二阶修正三种修正算法及观测噪声的影响。以Galileo系统的四个载波频率为例,对不同频率组合下三种修正算法进行了比较。结果表明电离层延迟多频修正中,并不是观测量的频点数越多或修正掉的高阶项越多修正精度越高,还与观测伪距噪声的大小以及采用的修正方法有关。为多频测距系统的电离层延迟修正算法和最佳频率组合设计提供了一种可行的分析方法。
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| 关 键 词： | 电离层延迟 多频伪距 噪声放大倍数 Galileo |
Three multi-frequency correction methods' comparison of ionospheric delay |
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| WANG Meng-li,WANG Fei-xue.Three multi-frequency correction methods' comparison of ionospheric delay[J].Science of Surveying and Mapping,2008,33(4). |
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| Authors: | WANG Meng-li WANG Fei-xue |
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| Abstract: | Pseudorange errors such as observe-noise etc are magnified when the ionospheric error in ionospheric delay's correction is weakened.Three multi-frequency correction algorithms such as dual-frequency,triple-frequency of one order and triple-frequency of two orders are discussed.Taking the four carrier frequencies of Galileo as an example,three algorithms' with different frequencies' combinations are compared.The result indicates that precision of multi-frequency correction not only depends on frequency numbers observed or high orders items corrected,but also hase relation to noise magnitude and correcting method selected.The study offers a feasible analytical method for multi-frequency ranging systems in ionospheric delay's correction and optimal frequency combinations' design. |
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| Keywords: | lonospheric delay multi-frequency pseudorange noise magnify multiple Galileo |
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