This research investigates the mutual interference between a GNSS signal refracted through the atmosphere and the same signal reflected from the surface below. For low‐altitude occultations, the reflected signal can be present as multipath when tracking the direct signal. This poses a problem when making remote sensing measurements using GNSS‐RO or GNSS‐R techniques. Here, this issue is addressed in the context of GNSS data collected by a mountaintop receiver on the Hawaiian island of Maui. First, an elevation‐angle threshold, below which the reflected signal can be present as multipath on the direct signal, is calculated for the mountaintop geometry. Next, the first steps are taken to mitigate the mutual interference between the direct and reflected signals. A frequency‐domain filtering approach and a time‐domain smoothing approach are applied to the signal intensity in an effort to separate the multipath contribution and the direct signal contribution.

中文翻译：

---

表征和缓解GNSS无线电掩星和低空掩星的反射法信号之间的干扰

这项研究调查了通过大气折射的GNSS信号与从下面的表面反射的同一信号之间的相互干扰。对于低空掩星，当跟踪直接信号时，反射信号可以呈现为多径。使用GNSS-RO或GNSS-R技术进行遥感测量时，这会带来问题。在这里，这个问题是在夏威夷毛伊岛的山顶接收器收集到的GNSS数据的背景下解决的。首先，计算山顶几何形状的仰角阈值，在该阈值以下，反射信号可以作为多径出现在直接信号上。接下来，采取第一步以减轻直接信号和反射信号之间的相互干扰。