Jason-2高度计电离层GIM误差分析及修正研究

黄霞凤; 苗洪利; 苗翔鹰; 薛文文

doi:10.3969/j.issn.0253-4193.2019.07.013

Jason-2高度计电离层GIM误差分析及修正研究

doi: 10.3969/j.issn.0253-4193.2019.07.013

中国海洋大学信息科学与工程学院，山东青岛 266100

基金项目: 海洋环境安全保障重点专项“三维成像雷达高度计海洋信息提取技术及应用”（2016YFC1401004）。

详细信息

作者简介:
黄霞凤（1993—），女，安徽省黄山市人，主要从事海洋遥感方面研究。E-mail：huangxiafeng@stu.ouc.edu.cn

通讯作者:
苗洪利（1964—），男，山东省青岛市人，教授，主要从事海洋遥感方面研究。E-mail：oumhl@ouc.edu.cn

中图分类号: P715.6
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-30
- 修回日期: 2018-11-02
- 网络出版日期: 2021-04-21
- 刊出日期: 2019-07-25

Analysis and correction of GIM error about Jason-2 altimeter

College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China

摘要

摘要: 基于Jason-2高度计2015年地球物理数据集(GDR)38个周期太平洋海域的全球电离层图(GIM)电离层校正值和双频校正值的数据，分不同季度和不同纬度区域比较二者的差异，结果表明：GIM值与双频校正值之间存在明显的差异，GIM校正值普遍高于双频校正值，说明GIM高估了电离层路径延迟，GIM校正值与双频校正值的差异与季节和纬度区间有关。用梯度下降法得到GIM值的修正方程，将修正方程应用于2016年Jason-2的全年数据，修正后的GIM值与双频校正值十分接近，在各年份中均具有良好的适用性。在单频高度计不能使用电离层双频校正算法的情况下，可以利用不同季度和不同纬度区域的修正方程对同等高度的高度计GIM值进行修正以达到双频校正值的精度水平。
- 雷达高度计 /
- 电离层路径延迟 /
- 双频校正算法 /
- 全球电离层图
Abstract: Based on the ionospheric correction data of Global Ionospheric Map (GIM) and dual-frequency, extracting the Pacific Ocean dataset from the Jason-2 Altimeter’s Geophysical Data Set (GDR) including 38-period in 2015. The dataset is divided into small twelve cell according to the features of ionosphere over seasons and in latitude. The result shows that there is a significant difference between the GIM and the dual-frequency correction value, and the GIM correction value is generally higher than the dual-frequency correction value, indicating that GIM overestimates the ionosphere path delay, also, the difference between the GIM and the dual-frequency is related to the season and latitude. Applying the modified equation to the 2016 Jason-2 annual data, the corrected GIM value is very close to the dual-frequency correction value, and the applicability of the modified equation remains the same over time. In the case where the single-frequency altimeter cannot use the ionospheric dual-frequency correction algorithm, the GIM value of the altimeter of the same height can be corrected by using the correction equations of different quarters and different latitude regions to achieve the accuracy level of the dual-frequency correction value.
- radar altimeter /
- ionospheric path delay /
- dual-frequency correction algorithm /
- global ionospheric map

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图 1 太平洋区域DF值和GIM值散点图

Fig. 1 The DF and GIM scatter plots for the Pacific Ocean

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图 2 太平洋区域DF与GIM差值概率密度分布

Fig. 2 Distribution of the probability density between DF and GIM in the Pacific Ocean

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图 3 不同季度下DF与GIM差值分布

Fig. 3 Distribution of DF and GIM difference in different quarters

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图 4 第1季度不同纬度修正前后DF与GIM差值分布

Fig. 4 Distribution of difference between DF and GIM before and after correction at different latitudes in the first quarter

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图 5 第2季度不同纬度修正前后DF与GIM差值分布

Fig. 5 Distribution of difference between DF and GIM before and after correction at different latitudes in the second quarter

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图 6 第3季度不同纬度修正前后DF与GIM差值分布

Fig. 6 Distribution of difference between DF and GIM before and after correction at different latitudes in the third quarter

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图 7 第4季度不同纬度修正前后DF与GIM差值分布

Fig. 7 Distribution of DF and GIM differences before and after correction at different latitudes in the fourth quarter

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表 1 太平洋全域、全年DF值与GIM值的统计结果

Tab. 1 The overall of the Pacific Ocean and annual statistical result of DF and GIM

M_DF/cm	S_DF/cm	M_GIM/cm	S_GIM/cm	M_(DF-GIM)/cm	S_(DF-GIM)/cm
4.73	3.45	5.46	3.79	–0.73	1.04

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表 2 不同季度及不同区域DF值与GIM值统计结果

Tab. 2 The satistics of DF and GIM in different quarters and different regions

区域	季度	M_DF/cm	S_DF/cm	M_GIM/cm	S_GIM/cm	M_(DF-GIM)/cm	S_(DF-GIM)/cm
北中纬	1	3.61	2.87	4.45	3.19	−0.84	0.88
	2	5.19	2.64	6.18	2.91	−0.99	0.92
	3	3.43	1.70	4.01	1.87	−0.58	0.77
	4	2.52	1.74	2.97	1.93	−0.45	0.72
低纬度	1	8.73	5.41	9.81	5.74	−1.08	1.48
	2	7.70	4.35	9.01	4.64	−1.31	1.37
	3	5.27	2.88	6.26	3.22	−0.99	1.08
	4	6.20	3.80	6.91	4.05	−0.71	1.21
南中纬	1	5.62	2.32	6.35	2.56	−0.73	0.99
	2	3.15	1.66	3.65	1.95	−0.51	0.82
	3	2.29	1.15	2.55	1.37	−0.26	0.67
	4	4.14	1.63	4.60	1.84	−0.46	0.80

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表 3 修正方程系数及r值

Tab. 3 The coefficient and r value of the correction equation

区域季度		α	β	r
北中纬	1	0.83	0.01	0.92
	2	0.84	−0.01	0.93
	3	0.85	−0.02	0.93
	4	0.85	−0.02	0.94
低纬度	1	0.89	0.01	0.95
	2	0.86	0.01	0.92
	3	0.84	−0.01	0.94
	4	0.90	−0.01	0.96
南中纬	1	0.88	−0.02	0.96
	2	0.84	−0.03	0.98
	3	0.86	−0.04	0.99
	4	0.88	−0.03	0.99

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表 4 GIM修正前后指标评价

Tab. 4 Evaluation of before and after GIM corrections

区域	季度	修正前		修正后
区域	季度	M_(DF-GIM)/cm	S_(DF-GIM)/cm	M_(DF-GIM)/cm	S_(DF-GIM)/cm
北中纬	1	−1.16	0.88	−0.47	0.80
	2	−1.36	0.93	−0.48	0.85
	3	−0.77	0.84	−0.04	0.76
	4	−0.59	0.84	−0.04	0.70
低纬度	1	−1.37	1.24	−0.53	1.19
	2	−1.43	1.36	−0.33	1.23
	3	−1.07	1.23	−0.11	1.14
	4	−0.89	1.31	−0.06	1.20
南中纬	1	−0.90	1.00	−0.30	0.92
	2	−0.81	0.99	−0.29	0.80
	3	−0.33	0.78	−0.12	0.68
	4	−0.56	1.02	−0.12	0.91

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