Using a multipath hemispherical map model to mitigate multipath effects in GPS triple-frequency PPP time transfer

doi:10.13474/j.cnki.11-2246.2025.1014

Bulletin of Surveying and Mapping ›› 2025, Vol. 0 ›› Issue (10): 82-86,113.doi: 10.13474/j.cnki.11-2246.2025.1014

Using a multipath hemispherical map model to mitigate multipath effects in GPS triple-frequency PPP time transfer

QU Lizhong¹, ZHENG Bingyan¹, LI Jingchao¹, MEN Mingyu¹, ZHANG Beibei¹, WU Runze^2,3

1. School of Geomatics and Urban Spatial Information, Beijing University of Civil Engineering and Architecture, Beijing 102616, China;
2. Surveying and Natural Resource Spatial Data Technology Wu Runze Studio, Beijing Institute of Surveying and Mapping Design and Research, Beijing 100045, China;
3. Beijing Skill Master Studio, Beijing 100045, China

Received:2025-06-19 Published:2025-10-31

Abstract

Abstract: To mitigate the multi-path effects in GPS triple-frequency PPP time transfer and improve the accuracy and stability of time transfer.Three baselines are selected for the experiment: USN7-USN8 (0 km), IENG-WAB2 (212 km)and PTBB-WAB2 (3406 km).Using the residuals from seven days of GPS triple-frequency PPP observations (from solar day 061 to 068 in 2024)at these six stations, a GPS triple-frequency observation multi-path hemispherical map model is constructed.The performance of GPS dual-frequency and triple-frequency PPP time transfer before and after multipath correction on solar day 069 in 2024 is compared.The Allan variance of receiver clock differences for the three baselines of GPS dual-frequency and triple-frequency PPP solutions improved by 36.1%, 25.3%, and 12.4%, respectively, and by 36.8%, 25.6%, and 12.8%, respectively.The multipath hemispherical map model constructed based on observation residuals can effectively suppress multi-path errors and enhance the stability and accuracy of GPS triple-frequency PPP time transfer.

Key words: GPS triple-frequency, multi-path error, multi-path hemispherical map model, Allen variance, receiver clock bias

CLC Number:

P228

QU Lizhong, ZHENG Bingyan, LI Jingchao, MEN Mingyu, ZHANG Beibei, WU Runze. Using a multipath hemispherical map model to mitigate multipath effects in GPS triple-frequency PPP time transfer[J]. Bulletin of Surveying and Mapping, 2025, 0(10): 82-86,113.

References

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Using a multipath hemispherical map model to mitigate multipath effects in GPS triple-frequency PPP time transfer

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