首页|Global tropospheric delay grid modeling based on Anti-Leakage Least-Squares Spectral Analysis and its validation
Global tropospheric delay grid modeling based on Anti-Leakage Least-Squares Spectral Analysis and its validation
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NSTL
Elsevier
Tropospheric delay is one of the primary error sources of the Global Navigation Satellite System (GNSS). Usually, a traditional empirical model can be corrected, which uses the trigonometric function of fixed amplitude and frequency for time fitting. However, the traditional models only retain the low-frequency information of the zenith tropospheric delay (ZTD), which limits its application in high time resolution. To solve this problem, a global tropospheric delay grid model, namely AGtrop, is developed based on Anti-Leakage Least-Squares Spectral analysis. The results of the AGtrop model are evaluated by three kinds of sources, including ERA5 data, IGS, and the sounding profile of radiosonde station throughout the year 2019. Compared with the traditional model GPT2w and UNB3m, AGtrop shows better performance, especially in low latitudes and the southern hemisphere. AGtrop can generally achieve a global mean Bias/RMSE of 0.35/2.34 cm in contrast to ERA5 derived ZTD, 0.59/ 2.29 cm in comparison with IGS ZTD, and 0.18/3.71 cm in the match to Radiosonde derived ZTD. Besides, the AGtrop model has an enhancement effect in localized areas. AGtrop model is characterized by simplicity and accuracy, which will be of great significance to real-time GNSS applications.
NSTL
Elsevier
