VNU-UET Repository

Application of GNSS-Reflectometry to evaluate the ability to detect moisture changes of sandy soils

Ha, Minh Cuong and Vu, Phuong Lan Application of GNSS-Reflectometry to evaluate the ability to detect moisture changes of sandy soils. In: Hội thảo GIS toàn quốc 2020, Tháng 12 năm 2020.

Download (1MB) | Preview


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.

Item Type: Conference or Workshop Item (Paper)
Subjects: Aerospace Engineering
Agriculture Technology
Divisions: School of Aerospace Engineering (SAE)
Depositing User: PhD Minh Cuong HA
Date Deposited: 28 Jun 2021 00:08
Last Modified: 28 Jun 2021 00:08

Actions (login required)

View Item View Item