| 多参考站GPS网提取精密大气延迟 |
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| 引用本文： | 张宝成,欧吉坤,袁运斌,蒋振伟.多参考站GPS网提取精密大气延迟[J].测绘学报,2012,41(4):523-528. |
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| 作者姓名： | 张宝成 欧吉坤 袁运斌 蒋振伟 |
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| 作者单位： | 1. 中国科学院测量与地球物理研究所动力大地测量学重点实验室,湖北武汉430077／中国科学院研究生院,北京100049
2. 中国科学院测量与地球物理研究所动力大地测量学重点实验室,湖北武汉,430077 |
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| 基金项目： | 国家自然科学基金，国家海洋局第二海洋研究所基本科研业务经费 |
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| 摘 要： | 多参考站GPS网提取的大气延迟可服务于天气预报、精密定位等领域,但相关的提取方法存在缺陷,如已知信息利用不充分、大气延迟模型化误差较大等,影响提取结果的可靠性。从改进的GPS网平差策略入手,导出一种新的提取方法,其主要特点包括:①直接处理非差GPS观测值,并采用重新参数化方案消除观测方程中的列秩亏;②发掘各参考站坐标已知、整数双差模糊度等条件;③估计斜向的电离层延迟,且采用常速度过程模型化其时间变化特性。试验表明,新方法提取的大气延迟可实现优于1 cm的短期预报精度。
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| 关 键 词： | GPS 大气延迟 重新参数化 多参考站网 |
Extracting Precise Atmospheric Propaganda Delays from Multiple Reference Station GPS Networks |
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| ZHANG Baocheng,OU Jikun,YUAN Yunbin,JIANG Zhenwei.Extracting Precise Atmospheric Propaganda Delays from Multiple Reference Station GPS Networks[J].Acta Geodaetica et Cartographica Sinica,2012,41(4):523-528. |
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| Authors: | ZHANG Baocheng OU Jikun YUAN Yunbin JIANG Zhenwei |
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| Institution: | 1,2 1.Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | The atmospheric propaganda delays extracted from multiple reference station GPS networks can serve for weather forecasting,precise positioning and so on,the related extracting method however consists of drawbacks that affect the reliability of the obtainable results,such as inadequate adoption of the known information,severe atmospheric modeling errors.Starting from the modified strategy for GPS network processing,a novel extracting method is derived,whose main points include: ① directly processing of the un-differenced GPS observables,and elimination of the rank-deficiencies in the observation equations based upon re-parameterization;② exploiting the conditions of a-priori known coordinates of the reference stations and the integer-valued nature of the double-differenced ambiguities;③ introducing the slant ionospheric delays as one of the unknowns,whose temporal behaviors are characterized as constant-velocity process.Experimental results demonstrate that the short-term predicting precision of the atmospheric delays derived from the new method is at the level better than 1 cm. |
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| Keywords: | GPS atmospheric propaganda delays re-parameterization multiple reference station networks |
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