@inproceedings{SisLab4100,
       booktitle = {GIS Conference Proceeding 2020},
           title = {Application of GNSS-Reflectometry to evaluate the ability to detect moisture changes of sandy soils},
          author = {Minh Cuong Ha and Phuong Lan Vu},
       publisher = {Tr??ng {\DJ}{\d a}i h{\d o}c Ba?ch Khoa ? {\DJ}HQG-HCM},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/4100/},
        abstract = {With population growth, water demand is expected to tremendously increase in the next decades. The optimization of water allocation for agriculture requires soil moisture monitoring. Recent studies suggested to take advantage of continuously emitted navigation signals by the Global Navigation Satellite System (GNSS) constellations, to retrieve soil moisture variations. This active remote sensing technique, known as GNSS Reflectometry (GNSS-R), consists in comparing the interference of reflected waves by the ground and those which come directly from satellites. It offers a wide range of applications in Earth sciences and particularly in soil moisture monitoring, this technique has shown their efficiency for soil with high clay content. It namely presents the advantage of sensing a whole surface around a reference GNSS antenna. In this article, we focus on soil moisture monitoring of sandy areas. The study site is a beach volley field, located in the Paul Sabatier University campus in Toulouse, France, the soil contains 100\% of sand. We demonstrated that the waves of the GNSS signals penetrate deeply into the soil and reduce the interest of GNSS-R surface moisture measurements. However, it is possible to retrieve a correct estimate of the soil moisture at 0.1m depth and to obtain a very good temporal monitoring with the benefit of a spatial resolution directly correlated to the antenna height.}
}