Optimized Spherical Harmonic Function Model for Ionospheric Delay Correction
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摘要: 针对单频接收机的电离层延迟改正问题, 提出了一种基于系数择优的低阶球谐电离层延迟改正模型. 按照电离层延迟改正模型参数择优问题的描述, 明确参数优化的目标和约束条件, 根据参数选择可编码的特点, 提出了利用遗传算法进行参数择优的方法及步骤. 以欧洲定轨中心(CODE)提供的电离层数据作为参考标准, 对参数择优模型、 低阶球谐模型和Klobuchar模型模拟的区域电离层VTEC精度进行了比较分析. 结果表明, 较之相同系数个数的低阶球谐模型, 参数择优模型精度平均改进了1~2TECU, 而且比Klobuchar模型及低阶球谐模型能更好地反映电离层的周日变化及纬度变化特征.Abstract: Aiming at the ionospheric delay correction of single-frequency receiver, this paper proposes an optimized low-order spherical harmonic function model. Firstly, the description method of optimized ionospheric delay correction model is discussed and the objective and restraint condition of optimizing coefficients are defined. Then, according the characteristics that coefficients can be encoded, method and steps of using genetic algorithms to optimize coefficients are presented. Lastly, the accuracy analysis and comparison are made with Klobuchar based on the the ionosphere VTEC produced by CODE. The results show that accuracy of the optimized model is improved. It has an improvement about 1~2 TECU than the low-order spherical harmonic function model with the same number of coefficients and can better reflect the daily change of VTEC and the characteristics which vary with latitude.
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[1] Zhang Hongping, Ping Jinsong, Zhu Wenyao. Brief review of the ionospheric delay models[J]. Prog. Astron., 2006, 24(1):16-25. In Chinese (章红平,平劲松,朱文耀,等.电离层延迟改正模型综述[J]. 天文学进展, 2006, 24(1):16-25) [2] Huang Wengeng, Chen Yanhong, Shen Hua, Zhuang Chunbo.Study of ionospheric TEC horizontal gradient by means of GPS observations[J]. Chin. J. Space Sci., 2009, 29 (2): 183-187. In Chinese (黄文耿, 陈艳红, 沈华, 庄淳孛. 用GPS观测研究电离层TEC水平梯度[J]. 空间科学学报, 2009, 29 (2): 183-187) [3] Zhang Hongping, Han Wenhui. Modeling global ionospheric delay with IGS ground-based GNSS observations[J]. Geomat. Inf. Sci. Wuhan Univ., 2012, 37(10): 1186-1189. In Chinese (章红平, 韩文慧. 地基GNSS全球电离层延迟建模[J]. 武汉大学学报, 2012, 37(10):1186-1189) [4] Yuan Yunbin, Huo Xingliang. Study on the models and methods of obtaining ionospheric delay of GPS signal precisely[J]. Prog. Nat. Sci., 2006, 26(1):40-48. In Chinese (袁运斌, 霍星亮. 精确求定GPS信号的电离层延迟的模型与方法研究 [J]. 自然科学进展, 2006, 26(1):40-48) [5] Bidaine B, Warnant R. Ionosphere modeling for Galileo single frequency users: illustration of the combination of the NeQuick model and GNSS data ingestion[J]. Adv. Space Res., 2010, 1(9):51-61 [6] Yang Zhe, Song Shuli. Accuracy assessment of Klobuchar model and Nequick model in China[J]. Geomat. Inf. Sci. Wuhan Univ., 2012, 37(6):704-708. In Chinese (杨哲, 宋淑丽. Klobuchar模型和NeQuick模型在中国地区的精度评估[J]. 武汉大学学报, 2012, 37(6):704-708) [7] Klobuchar J A. Ionospheric time-delay algorithm for single-frequency GPS users[J]. IEEE Trans. Aeros. Electr. Syst., 1987, 23(3):325-331 [8] Zhao Wei, Zhang Chengyi. Practical analysis and improvement of Klobuchar model[J]. Chin. J. Space Sci., 2013, 33(6):624-628. In Chinese (赵威, 张成义. Klobuchar模型的实用分析与改进[J]. 空间科学学报, 2013, 33 (6):624-628) [9] Li Weipeng, Li Jianwen. Study on the methods of updating Klobuchar ionospheric delay correction model[J]. Sci. Surv. Mapp., 2009, 34(5): 49-51. In Chinese (李维鹏, 李建文. Klobuchar电离层延迟改正模型精化方法的研究[J]. 测绘科学, 2009, 34 (5):49-51) [10] Schaer S. Mapping and Predicting the Earth's Ionosphere Using the Global Positioning System[D]. Bern, Swiss: The University of Bern, 1999 [11] Ola Ovstedal. Absolute positioning with single-frequeney GPS receivers[J]. GPS Solut., 2002, 5(4):33-44 [12] Li Qiang, Ning Baiqi. Applications of the CMONOC based GNSS data in monitoring and investigation of ionospheric space weather[J]. Chin. J. Geophys., 2012, 55(7):2193-2202. In Chinese (李强, 宁百齐. 基于陆态网络GPS数据的电离层空间天气监测与研 究[J]. 地球物理学报, 2012, 55(7):2193-2202) [13] Wang Ling. Intelligent Optimization Algorithms with Application[M]. Beijing: Tsinghua Press, 2001:36-61. In Chinese (王凌. 智能优化算法及其应用[M]. 北京:清华大学出版社, 2001:36-61)
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