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Improving performance of GPS satellite DCB estimation for regional GPS networks using long-term stability

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Abstract

Compensation for differential code bias (DCB) is necessary because it is the major source of errors in total electron content (TEC) measurements. The DCB estimation performance is degraded when only the regional GPS network is used. Because DCB estimation is highly correlated with ionospheric modeling, this degradation is particularly evident for measurements concentrated in an area of high TEC concentration. This study proposes a DCB estimation method that uses the long-term stability of the DCB to improve the estimation performance of the regional GPS network. We estimate satellite DCBs by assuming their constancy over seven months. This extended period increases the number of measurements used in DCB estimation and changes the local time distribution of collected measurements. As a result, the unbalanced distribution of specific ionospheric conditions disappears. Tests are performed using both global and regional networks, and the estimation performance is evaluated based on the position error and pseudorange residuals. First, the difference between the global and regional networks when using the conventional method is analyzed. Second, proposed methods are applied to regional networks. The proposed method can improve the DCB estimation performance, and the results are similar to those obtained using one-day global network data.

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Acknowledgement

This research was supported by Development of Space Core Technology Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2017M1A3A3A02016230), contracted through the Institute of Advanced Aerospace Technology.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering and SNU-IAMD, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Korea

    Deokhwa Han, Donguk Kim & Changdon Kee

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  1. Deokhwa Han
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  2. Donguk Kim
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  3. Changdon Kee
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Correspondence to Changdon Kee.

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Han, D., Kim, D. & Kee, C. Improving performance of GPS satellite DCB estimation for regional GPS networks using long-term stability. GPS Solut 22, 13 (2018). https://doi.org/10.1007/s10291-017-0669-7

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