Global Navigation Satellite Systems (GNSS) have been routinely used for geodetic-based survey and mapping studies such as precise point positioning, landslide, earthquake and crustal deformation monitoring, engineering surveys, in short, where accurate positioning is required. To do that, the GNSS observables should be eliminated from the error sources. Among the error sources affected to GNSS data, multipath stands for one of the largest error sources and should be removed. This multipath affects the strength of received microwave signal or signal-to-noise ratio (SNR), which is recorded at the GNSS antenna. As of now, many studies are successfully conducted to retrieve reflector height from signal-to-noise ratio (SNR) data gathered with a geodetic GNSS receiver. However, GNSS SNR data collected from a smartphone may also show a pattern for interferences of the direct and reflected signals from where the aforementioned heights are retrieved. In this study, an experimental site was setup to retrieve effective reflector height from a permanent mast attaching both smartphone with single frequency and geodetic GNSS receiver. The GNSS SNR data were gathered by the same time interval for a specific vertical height from the ground for three days and for approximately 5-h daily observation durations. The validation of the estimated reflector heights was performed by the root mean square error (RMSE) analysis. The RMSEs of estimated reflector heights for Xiaomi Mi 8 Lite and Trimble NetR9 geodetic receiver are computed as 1.9 and 3.7 cm, respectively. The initial results show that the outcomes of the analysis agree well with whether the in-situ measurements or the mean values via RMSEs. According to the performance assessments for accurate height detection and cost efficiency, single-frequency smartphones can be used to extract the reflector height from the collected raw SNR data.

全球导航卫星系统（GNSS）通常用于基于大地测量的调查和制图研究，例如精确的点定位，滑坡，地震和地壳形变监测，工程勘测，总之要求精确定位。为此，应从错误源中消除GNSS观测值。在受GNSS数据影响的错误源中，多径代表最大的错误源之一，应将其删除。此多径会影响接收到的微波信号的强度或信噪比（SNR），该强度会记录在GNSS天线上。到目前为止，已经成功进行了许多研究，以大地测量GNSS接收器收集的信噪比（SNR）数据检索反射器的高度。然而，从智能手机收集的GNSS SNR数据也可能显示一种模式，该模式用于从中检索上述高度的直接信号和反射信号的干扰。在这项研究中，设置了一个实验站点，以从固定单频率智能手机和大地测量GNSS接收器的永久桅杆上检索有效的反射器高度。GNSS SNR数据以相同的时间间隔收集，距地面特定的垂直高度持续3天，每天观察约5小时。估计的反射器高度的验证是通过均方根误差（RMSE）分析进行的。小米Mi 8 Lite和Trimble NetR9大地测量接收器的估计反射器高度的RMSE分别计算为1.9 cm和3.7 cm。初步结果表明，分析的结果与现场测量还是通过RMSE的平均值吻合得很好。根据对准确的高度检测和成本效率的性能评估，可以使用单频智能手机从收集的原始SNR数据中提取反射器的高度。