LEO卫星单频精密定轨电离层模型改进算法
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...
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| Veröffentlicht in: | Ce hui xue bao 2016-07, Vol.45 (7), p.803-809 |
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| creator | 田英国 郝金明 于合理 刘伟平 谢建涛 张康 |
| description | 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%。 |
| doi_str_mv | 10.11947/j.AGCS.2016.20150628 |
| format | Article |
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| language | chi ; eng |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Algorithms Constraint modelling Delay Deviation Electron density Ionosphere IRI2012模型 Low earth orbit satellites Low earth orbits Orbit determination Parameter estimation Satellite observation Satellites Solar activity Swarm卫星 单频精密定轨 电子密度峰值高度 电离层比例因子法 |
| title | LEO卫星单频精密定轨电离层模型改进算法 |
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