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<p>Estimation and correction of Global Navigation Satellite System (GNSS) satellite uncalibrated phase delays (UPDs) is crucial for ambiguity resolution (AR) in precise point positioning (PPP). The estimation accuracy of narrow-lane (NL) UPD may vary depending on the GNSS data processing methods. However, a comprehensive evaluation and comparison of different estimation schemes is still lacking. Utilizing 30 consecutive days of observation data from 109 globally distributed multi-GNSS stations, this study evaluates the performance of NL UPD estimated based on five schemes derived from precise orbit determination (POD), precise clock estimation (PCE), and PPP. The evaluation criteria include the daily stability of NL UPD, the distribution of fractional cycle residuals of NL ambiguities, the distribution of fractional cycle residuals of single-difference NL ambiguities in PPP AR, and the positioning accuracy of PPP AR. The results indicate that the fixed-solution POD and PCE schemes perform the best, followed by the PPP scheme. The float-solution PCE scheme underperforms compared to the PPP scheme, while the float-solution POD scheme performs the worst, significantly lagging behind the other four schemes. These findings provide valuable insights for selecting optimal UPD estimation scheme in GNSS data processing.</p>

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Evaluation of uncalibrated phase delays estimated based on orbit determination, clock estimation, and precise point positioning

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Chuanfeng Song,
  • Qi Xu,
  • Huizhong Zhu,
  • Jinzhong Mi,
  • Shouzhou Gu,
  • Hongjuan Yu,
  • Shilong Geng,
  • Xinning Pei

摘要

Estimation and correction of Global Navigation Satellite System (GNSS) satellite uncalibrated phase delays (UPDs) is crucial for ambiguity resolution (AR) in precise point positioning (PPP). The estimation accuracy of narrow-lane (NL) UPD may vary depending on the GNSS data processing methods. However, a comprehensive evaluation and comparison of different estimation schemes is still lacking. Utilizing 30 consecutive days of observation data from 109 globally distributed multi-GNSS stations, this study evaluates the performance of NL UPD estimated based on five schemes derived from precise orbit determination (POD), precise clock estimation (PCE), and PPP. The evaluation criteria include the daily stability of NL UPD, the distribution of fractional cycle residuals of NL ambiguities, the distribution of fractional cycle residuals of single-difference NL ambiguities in PPP AR, and the positioning accuracy of PPP AR. The results indicate that the fixed-solution POD and PCE schemes perform the best, followed by the PPP scheme. The float-solution PCE scheme underperforms compared to the PPP scheme, while the float-solution POD scheme performs the worst, significantly lagging behind the other four schemes. These findings provide valuable insights for selecting optimal UPD estimation scheme in GNSS data processing.