Knowledge of Global Navigation Satellite System (GNSS) antenna phase center variations plays a key role in precise positioning. Proper modeling is achieved by accessing antenna phase center corrections, which are determined in the calibration process. For most receiver antenna types, the International GNSS Service provides such corrections for two GPS and GLONASS carrier signals. In the case of Galileo, access to phase center corrections is difficult; only antennas calibrated in the anechoic chambers have available corrections for Galileo frequencies. Hence, in many of the studies, GPS-dedicated corrections are used for these Galileo frequencies. Differential analysis was conducted in this study to evaluate the impact of such change. In total, 25 stations belonging to the EUREF Permanent Network and equipped with individual calibrated antennas were the subject of this research. The results for both the absolute and relative positioning methods are clear: using GPS L2 corrections for Galileo E5a frequency causes a bias in the estimated height of almost 8 mm. For the horizontal component, a significant difference can be noticed for only one type of antenna.

中文翻译：

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GPS L2接收器天线校正对Galileo E5a频率的影响，对位置估计的影响

全球导航卫星系统（GNSS）天线相位中心变化的知识在精确定位中起着关键作用。通过访问在校准过程中确定的天线相位中心校正，可以实现正确的建模。对于大多数接收器天线类型，国际GNSS服务会为两个GPS和GLONASS载波信号提供此类校正。对于伽利略来说，很难获得相位中心校正。只有在消声室内校准的天线才能对伽利略频率进行校正。因此，在许多研究中，GPS专用校正用于这些伽利略频率。在这项研究中进行了差异分析，以评估这种变化的影响。总共，这项研究的主题是属于EUREF永久网络的25个电台，并配备了单独的校准天线。绝对和相对定位方法的结果都很清楚：对Galileo E5a频率使用GPS L2校正会导致估计高度接近8毫米的偏差。对于水平分量，仅一种类型的天线会有明显的不同。