大地测量与地球动力学2025，Vol.45Issue(6)：587-592,6.DOI:10.14075/j.jgg.2024.07.325
基于多路径半天球图的高频GNSS实时同震位移修正
Real-Time Coseismic Displacement Correction of High-Rate GNSS Based on Multipath Hemispherical Map
摘要
Abstract
To mitigate the unmodeled multipath errors in traditional dynamic precise point positioning(PPP)and enhance the accuracy of high-rate GNSS real-time coseismic displacement measurements,this paper constructed an undifferenced and uncombined PPP multipath error correction model based on the multipath hemispherical map(MHM).This method employs undifferenced and uncombined PPP to resolve the residuals of pseudorange and phase.It then constructs a refined MHM model using multi-day residual sequences,which is subsequently applied to dynamic PPP real-time positioning on the target day.Using the example of the Mw8.2 earthquake that occurred south of Alaska in 2021,we analyzed the real-time coseismic displacement results before and after model correction.The average RMS reduction rates in the E,N,U directions were 52.9％,55.0％,and 50.7％,respectively,lead-ing to an overall improvement of 51.7％.Comparing the real-time coseismic displacement extracted by the method in this paper with that extracted by the strong seismometer after baseline correction,the former more accurately reflects the displacement changes during the earthquake,indicating the stabili-ty and reliability of the proposed model.关键词
GNSS/非差非组合PPP/同震位移/MHM/多路径误差Key words
GNSS/undifferenced and uncombined PPP/coseismic displacement/MHM/multipath error分类
测绘与仪器引用本文复制引用
龙海立,李艳艳,董龙飞..基于多路径半天球图的高频GNSS实时同震位移修正[J].大地测量与地球动力学,2025,45(6):587-592,6.基金项目
国家自然科学基金(41804001) （41804001）
山东省自然科学基金(ZR2019BD006). National Natural Science Foundation of China,No.41804001 （ZR2019BD006）
Natural Science Foundation of Shandong Province,No.ZR2019BD006. （）
