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<p>Multi-frequency receiver-end phase center offset (PCO) corrections are currently available in igs20.atx, thanks to efforts from robot-based and chamber-based calibrations. However, some antenna patterns still lack complete multi-frequency PCO corrections due to the lengthy calibration cycles of these two methods. This study proposes a method based on a multi-frequency Precise Point Positioning (PPP) model to estimate the missing PCO corrections for these antenna patterns, utilizing data from ground-tracking stations. Using the PCOs in igs20.atx as benchmarks, the proposed method has been validated to achieve PCO determination accuracy of 0.4 mm, 0.4 mm and 1.6 mm for the east, north and up components, respectively. One month of data from 150 stations, covering 34 antenna patterns, was collected to calculate the missing PCOs for non-overlapping frequencies such as L5/E5b/E5ab/E6/B1I/B3I. The results show that one-month PCO estimates are consistently accurate, with a mean standard deviation of 0.3 mm, 0.3 mm and 0.4 mm for the three components. The monthly averages of these estimates are considered the final PCO solutions, which are then validated through kinematic and static PPP. The estimated PCO solutions significantly reduce the convergence time of triple-frequency GPS L1/L2/L5 PPP from 36 to 21 min. Additionally, they improve the vertical positioning accuracy by 5 mm, 3mm and 3mm on average for dual-frequency GPS, Galileo and BDS static positioning, respectively.</p>

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Multi-frequency phase center offset calibration for receiver antenna using precise point positioning

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Jiang Guo,
  • Jianghui Geng,
  • Pascale Defraigne

摘要

Multi-frequency receiver-end phase center offset (PCO) corrections are currently available in igs20.atx, thanks to efforts from robot-based and chamber-based calibrations. However, some antenna patterns still lack complete multi-frequency PCO corrections due to the lengthy calibration cycles of these two methods. This study proposes a method based on a multi-frequency Precise Point Positioning (PPP) model to estimate the missing PCO corrections for these antenna patterns, utilizing data from ground-tracking stations. Using the PCOs in igs20.atx as benchmarks, the proposed method has been validated to achieve PCO determination accuracy of 0.4 mm, 0.4 mm and 1.6 mm for the east, north and up components, respectively. One month of data from 150 stations, covering 34 antenna patterns, was collected to calculate the missing PCOs for non-overlapping frequencies such as L5/E5b/E5ab/E6/B1I/B3I. The results show that one-month PCO estimates are consistently accurate, with a mean standard deviation of 0.3 mm, 0.3 mm and 0.4 mm for the three components. The monthly averages of these estimates are considered the final PCO solutions, which are then validated through kinematic and static PPP. The estimated PCO solutions significantly reduce the convergence time of triple-frequency GPS L1/L2/L5 PPP from 36 to 21 min. Additionally, they improve the vertical positioning accuracy by 5 mm, 3mm and 3mm on average for dual-frequency GPS, Galileo and BDS static positioning, respectively.