Simultaneous Retrieval of Corn Growth Status and Soil Water Content Based on One GNSS Antenna

The retrieval of crop growth status using Global Navigation Satellite System Interferometric Reflectometry (GNSS-IR) has become a major area interest within the field vegetation remote sensing in recent years. Using only single GNSS antenna, it is difficult to determine and soil water content (SWC) vegetation-covered regions due plenty multi-path signals. Based on empirical mode decomposition spectrum difference, this study presents an algorithm that can decompose separate signals reflected by surface or corn canopy. Because low-roughness isotropic while canopy anisotropic, have higher proportion coherent components than those moduli between retrieved heights actual (for same interval from different satellites) least variance. In study, are separated variance heights. When grows taller (VWC) leaves becomes primary factor affecting direct signal’s intensity, as obstruct signal. Hence, VWC be calculated through power attenuation An experiment performed plot land covered with shows that, after multi-GPS-satellite fusion, correlations height, leaf VWC, (SWC), situ data reach 0.94, 0.92, 0.88, respectively. corresponding root mean square errors 0.195 m, 0.0055 kg/cm2, 0.0484 cm3/cm3,