In this study, the authors mainly explore the relationship between the data quality of smartphones equipped with global navigation satellite system (GNSS) modules and the accuracy and reliability of single-frequency real-time kinematic (RTK) positioning. Specifically, the visible satellite number, code minus carrier and the signal-to-noise ratio of the GNSS raw observations were evaluated through static experiments and dynamic experiments, and the performance difference between single-frequency global positioning system (GPS) RTK and single-frequency BeiDou Navigation Satellite System (BDS) RTK positioning was compared and analysed. In the static experiment, the average values of visible satellites of BDS and GPS in Xiaomi Mi 8 smartphone are 7.4 and 8.4, respectively. The average code minus carrier error of GPS is 5.234 m, the BDS is 5.518 m, and the average signal-to-noise ratio of GPS is ∼29.092 dB Hz and the BDS is ∼28.718 dB Hz. The data quality of the dynamic experiment is similar to the static experimental result. The positioning accuracy obtained by the static experiment from the single-frequency GPS RTK and single-frequency BDS RTK in the east/north/up (E/N/U) directions is 0.146/0.555/0.464 m and 0.843/0.287/0.317 m, respectively. The instability of BDS-locked satellite in dynamic experiment results the positioning accuracy of BDS RTK is lower than that of GPS.

中文翻译：

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小米米8智能手机GNSS数据质量分析和单频RTK定位性能评估

在这项研究中，作者主要探讨了配备全球导航卫星系统（GNSS）模块的智能手机的数据质量与单频实时运动（RTK）定位的准确性和可靠性之间的关系。具体而言，通过静态实验和动态实验评估了GNSS原始观测值的可见卫星数，代码负载波和信噪比，并评估了单频全球定位系统（GPS）RTK和单频全球定位系统（GPS）对北斗导航卫星系统（BDS）RTK定位频率进行了比较和分析。在静态实验中，小米Mi 8智能手机中BDS和GPS可见卫星的平均值分别为7.4和8.4。GPS的平均代码减去载波误差为5.234 m，BDS为5.518 m，GPS的平均信噪比约为29.092 dB Hz，而BDS约为28.718 dB Hz。动态实验的数据质量与静态实验结果相似。通过静态实验从单频GPS RTK和单频BDS RTK的东/北/上（E / N / U）方向获得的定位精度为0.146 / 0.555 / 0.464 m和0.843 / 0.287 / 0.317 m ， 分别。BDS锁定卫星的动态实验不稳定，导致BDS RTK的定位精度低于GPS。通过静态实验从单频GPS RTK和单频BDS RTK的东/北/上（E / N / U）方向获得的定位精度为0.146 / 0.555 / 0.464 m和0.843 / 0.287 / 0.317 m ， 分别。在动态实验中，BDS锁定卫星的不稳定性导致BDS RTK的定位精度低于GPS。通过静态实验从单频GPS RTK和单频BDS RTK的东/北/上（E / N / U）方向获得的定位精度为0.146 / 0.555 / 0.464 m和0.843 / 0.287 / 0.317 m ， 分别。BDS锁定卫星的动态实验不稳定，导致BDS RTK的定位精度低于GPS。