研究目的

To evaluate the influence of the GNSS satellites’ elevation angle on the reflected signals’ power levels for different surface types and to analyze the impact of the coherent scattering component in GNSS-R observables.

研究成果

Preliminary results showed that spaceborne LHCP,CyGNSS? profiles are differentially influenced by the elevation angle over different surface types. The increment of the scattered signals’ coherence for low elevation angles over soil and inland water bodies has to be considered for the experimental determination of canopyL from a spaceborne sensor. Over ocean surface, the study showed that the LHCP,CyGNSS? distributions over target areas with expected low-wind conditions tend to be like a Gaussian one, indicating the presence of a coherent component for low elevation angles.

研究不足

The study is limited by the complexity of land surfaces compared to ocean surfaces and the need for further research to apply GNSS-R for Soil Moisture Content (SMC) determination and Vegetation Water Content (VWC) monitoring.