Abstract
Vegetation is an important part of the terrestrial ecosystem and plays a vital role in the global carbon cycle. Traditional remote sensing methods have certain limitations in vegetation monitoring, and the development of GNSS-R (Global Navigation Satellite System-Reflectometry) technology provides a new and complimentary method. With the CYGNSS (Cyclone Global Navigation Satellite System) launch and the increased data acquisition, the use of spaceborne GNSS-R for vegetation monitoring has become a research hotspot. However, due to the complex characteristics of vegetation, its application in this field is still in the exploratory research stage. On the basis of reviewing the current research status, this paper points out the weak links of this technology in terms of polarization and observation geometry. Combined with the microwave vegetation scattering model, this paper analyzes the full polarization bistatic scattering characteristics of vegetation and points out the influence of vegetation parameters (density, water content, and vegetation diameters). The potential feasibility of polarization GNSS-R and future development trends of GNSS-R technology in quantitative retrieval (such as vegetation water content and biomass) are also discussed.
Highlights
Published: 22 October 2021The terrestrial ecosystem is the life support system that humans rely on for survival and development
There are eleven payloads on it, and one of them is the GNSS occultation and GNSS-R combined payload, whose potential scientific goal is for land surface remote sensing, and the corresponding research on land surface parameters will be carried out in Henan Province simultaneously [11]
Since GNSS-R is essentially a bistatic/multi-static radar operating in the L-band, and traditional microwave remote sensing has proven that this band is suitable for soil moisture observation [14,15], its current applications in land surface parameters are mostly concentrated on soil moisture [16,17,18,19,20,21]
Summary
The terrestrial ecosystem is the life support system that humans rely on for survival and development. There are eleven payloads on it, and one of them is the GNSS occultation and GNSS-R combined payload, whose potential scientific goal is for land surface remote sensing, and the corresponding research on land surface parameters (such as soil moisture and vegetation biomass) will be carried out in Henan Province simultaneously [11]. Since GNSS-R is essentially a bistatic/multi-static radar operating in the L-band, and traditional microwave remote sensing has proven that this band is suitable for soil moisture observation [14,15], its current applications in land surface parameters are mostly concentrated on soil moisture [16,17,18,19,20,21].
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