广东电力2025，Vol.38Issue(2)：47-56,10.DOI:10.3969/j.issn.1007-290X.2025.02.006
广东地区高精度电离层延迟模型构建方法
Construction Method of High-precision Ionospheric Delay Model for Guangdong Region
摘要
Abstract
The high-precision positioning technology of the global navigation satellite system(GNSS)is a key support for intelligent unmanned aerial vehicle(UAV)inspections.However,in the low-latitude region of Guangdong province,ionospheric activity is frequent and intense,and the correction accuracy of existing global ionospheric maps(GIM)is insufficient in this area,often leading to significant positioning deviations during UAV inspections.Therefore,this paper proposes an ionospheric delay correction method based on the satellite-based ionospheric model(SIM).This method firstly employs carrier phase-smoothed pseudorange techniques to precisely extract the total electron content(TEC)from dual-frequency GNSS observation data.Based on the data,a low-order polynomial model is independently established for each satellite,achieving accurate TEC correction and effectively avoiding the errors introduced by traditional mapping functions.By using empirical data from multiple continuous operating reference stations(CORS)in the Guangdong power grid,it carries out verification.The results show that the SIM significantly improves the correction accuracy of ionospheric delays,particularly in regions and periods of intense ionospheric activity.Under moderate solar activity conditions,the SIM demonstrates stable correction accuracy,with a daily average bias of 0.146 3×1016 electrons/m2and a standard deviation(STD)of 0.919 2×1016 electrons/m2.Under high solar activity conditions,the daily average bias and standard deviation increase to 0.146 9×1016 electrons/m2 and 1.193 7×1016 electrons/m2,respectively,indicating good adaptability and a much higher accuracy than GIM.The model also shows similar excellent performance in both winter and summer,confirming its strong environmental adaptability and stability.This provides an effective new solution for high-precision GNSS positioning and ionospheric delay correction in low-latitude regions.关键词
全球卫星导航系统/电离层延迟校正/单星电离层模型/总电子含量Key words
global navigation satellite system(GNSS)/ionospheric delay correction/satellite-based ionospheric model(SIM)/total electron content unit(TECU)分类
动力与电气工程引用本文复制引用
蔡泓威,江俊飞,李妍,叶世榕..广东地区高精度电离层延迟模型构建方法[J].广东电力,2025,38(2):47-56,10.基金项目
国家重点研发计划项目(2019YFC1509603) （2019YFC1509603）
中国南方电网有限责任公司科技项目(GDKJXM20210154) （GDKJXM20210154）
