| LEO卫星单频精密定轨电离层模型改进算法 |
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| 引用本文： | 田英国,郝金明,于合理,刘伟平,谢建涛,张康.LEO卫星单频精密定轨电离层模型改进算法[J].测绘学报,2016,45(7):803-809. |
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| 作者姓名： | 田英国 郝金明 于合理 刘伟平 谢建涛 张康 |
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| 作者单位： | 1. 信息工程大学导航与空天目标工程学院, 河南 郑州 450001;2. 北斗导航应用技术河南省协同创新中心, 河南 郑州 450001 |
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| 摘 要： | 电离层延迟的有效改正是LEO卫星单频精密定轨的关键所在。目前主要采用电离层比例因子法进行LEO卫星电离层延迟改正,但该方法在电子密度峰值高度确定时未考虑太阳活动、经纬度、昼夜变化、季节等因素的影响。IRI2012模型虽然考虑了上述因素对电子密度峰值高度的影响,但因其与电离层薄层高度选择的标准不一致,通常它们之间存在系统性偏差而无法直接使用。为此本文提出将电离层薄层高度作为约束条件对IRI2012模型确定的电子密度峰值高度的均值进行参数约束估计,得到一种改进的电离层模型算法,并利用Swarm卫星GPS观测数据对其进行验证。结果表明:改进的电离层模型对Swarm卫星径向、切向和法向定轨精度均有不同程度的提高,尤其对轨道径向和法向精度改善最为明显,分别提高了31.6%和32.0%;同时较大幅度地降低了轨道的系统性偏差,尤其是在径向和法向,分别平均降低了65.0%和54.7%。
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| 关 键 词： | 单频精密定轨 Swarm卫星 电离层比例因子法 电子密度峰值高度 IRI2012模型 |
| 收稿时间： | 2015-12-17 |
| 修稿时间： | 2016-04-12 |
Improved Ionospheric Model Algorithm for LEO Satellite Single-frequency Precise Orbit Determination |
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| TIAN Yingguo,HAO Jinming,YU Heli,LIU Weiping,XIE Jiantao,ZHANG Kang.Improved Ionospheric Model Algorithm for LEO Satellite Single-frequency Precise Orbit Determination[J].Acta Geodaetica et Cartographica Sinica,2016,45(7):803-809. |
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| Authors: | TIAN Yingguo HAO Jinming YU Heli LIU Weiping XIE Jiantao ZHANG Kang |
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| Institution: | 1. Institute of Navigation and Aerospace Engineering, Information Engineering University, Zhengzhou 450001, China;2. Beidou Navigation Technology Collaborative Innovation Center of Henan, Zhengzhou 450001, China |
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| Abstract: | Ionospheric delay correction is the core issue of LEO satellite single-frequency precise orbit determination.At present,“the method of ionosphere scale factor”is mainly adopted in the LEO satellite ionospheric delay correction,but the method doesn’t consider the electron density peak height along with the variation of factors,such as latitude and longitude,day and night,seasons,solar activity,etc. IRI2012 model while considering the influence of the above factors on the electron density peak height,but because of the height criteria inconsistent with ionosphere single layer model,there is usually a systematic deviation and can’t be used directly.Therefore,this paper puts forward to an improved ionospheric delay correction method,the ionosphere thin layer height as the constraint condition of IRI2012 model of electron density peak height of the mean parameter estimation.Based on Swarm satellite single-frequency observation data,the effectiveness of the method was verified.The results showed that:with the improved model of the ionosphere,the precision of Swarm satellite obit radial,tangential and normal was improved in varying degrees,especially for the radial and normal most obviously,improved on average by 31.6%and 32.0%,respectively.At the same time,the systemic deviation of the orbit reduced significantly, especially for the radial and normal,reduced on average by 65.0% and 54.7%,respectively. |
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| Keywords: | single-frequency precise orbit determination Swarm satellite the method of ionospheric scale factor the height of electron density peak international reference ionosphere 2012 |
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