| 电离层延迟对单频GPS点的影响及改正方法研究 |
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| 引用本文： | 张超,戴吾蛟,石强,曾凡河,匡翠林.电离层延迟对单频GPS点的影响及改正方法研究[J].武汉大学学报(信息科学版),2018,43(3):471-477. |
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| 作者姓名： | 张超 戴吾蛟 石强 曾凡河 匡翠林 |
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| 作者单位： | 1.中南大学测绘与遥感科学系, 湖南 长沙, 410083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)2013CB733303中南大学研究生自主探索创新基金2014zzts258 |
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| 摘 要： | 电离层延迟是单频GPS地面沉降监测点的最主要误差源，如何削弱该误差的影响是提高单双频混合地面沉降监测系统精度的关键。采用中国广州南沙单双频混合GPS地面沉降监测网数据进行处理分析，结果表明，在低纬度地区即使基线较短，电离层延迟对单频GPS监测精度影响仍然较大，影响程度随基线长度增加而增大，而且在时间域上有明显的季节性变化规律:2、3月份与8、9月份电离层影响较为显著。利用双频点数据从观测值域对单频点电离层延迟误差进行改正，监测精度提高了57%，改善效果明显。
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| 关 键 词： | 单频GPS 地面沉降监测 电离层延迟 单双频混合 |
| 收稿时间： | 2016-02-29 |
Influence of Ionosphere Delay on Single Frequency GPS Point and its Correction Method |
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| Institution: | 1.School of Geoscience and Info-Physics, Central South University, Changsha 410083, China2.Key Laboratory of Precise Engineering of Surveying & Deformation Disaster Monitoring of Hunan Province, Changsha 410083, China |
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| Abstract: | Ionosphere delay is the dominant error source of single frequency GPS ground deformation monitoring point coordinate precision, how to reduce the error source influence is the key point to enhance the precision of single and dual frequency mixed ground deformation monitoring system. Based on the data of Guangzhou Nansha single and dual frequency mixed GPS ground deformation monitoring network, analysis indicates that ionosphere delay influence is still large, even though the baseline length is short in low latitude region. The impact of ionosphere delay aggravates as baseline length increases, and the rule of seasonal change is quite obvious:significant in February, March, August and September. Dual frequency data is used to correct the ionosphere delay error in observation value domain, as a result, the precision is improved by 57%, indicating that the effect of observation domain correction is obvious. |
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