Global Navigation Satellite System Reflectometry

Global Navigation Satellite System Reflectometry is passive sensing of the satellites' navigation signals, including all GNSS sources. For this purpose, the GNSS receiver measures the signal delay from the satellite and the rate of change of the range between satellite and observer. The surface area of the reflected GNSS signal also provides the two parameters time delay and frequency change. Since the mid-1990s, researchers have been interested in using data collected through this system to measure the signal delay received. In addition, analyzing these signals provides scientists with new information about the Earth's atmosphere (Rajabi et al. 2020).