SoOP-Reflectometry or GNSS-Reflectometry: Theory and Applications

Dear Colleagues,

Signal of opportunity reflectometry has attracted increasing interest in the past three decades, especially with the invention of the GNSS reflectometry (GNSS-R), which employs the signals of GNSS constellations as the active source. With the launch of the first space-borne GNSS-R mission, i.e., the UK-DMC, a series of satellite missions were and are being launched for similar purposes, such as the TDS-1, the CYGNSS, the FY-3E GNOS-R, the HydroGNSS, etc. Meanwhile, signals from other satellites (communication, tv, etc.) could be also employed as an active source for this kind of remote sensing technique. The applications of this new and promising technique include monitoring in the microwave spectrum and the characterization of both ocean and land surfaces. Among others, the advantages of GNSS-R mainly center around its low costs, low power consumption, light weight, and small volume, being an efficient substitute or complement to traditional microwave remote sensing techniques. Thus, theory on scattering mechanisms and retrieval methods of physical variables for different application fields is very important.

The aim of this Special Issue is to focus on revealing theoretical mechanisms and solving the problems in current retrieval algorithms. Topics may cover the forward scattering models, including both ocean and land surface scenarios. Retrieval algorithms based on theoretical models are warmly welcome. Of course, new applications of SoO-R or GNSS-R are also accorded a very hearty welcome.

Articles may address, but are not limited, to the following topics:

• Theoretical mechanism models for SoOP-R/GNSS-R, including ocean surface and land surface;
• Retrieval algorithms based ontheoretical models of GNSS-R/IR for the ocean scenario;
• Retrieval algorithms based ontheoretical models of GNSS-R/IR for the land surface scenario;
• New and potential applications of SoOP-R/GNSS-R.

Dr. Xuerui Wu
Dr. Andrés Calabia
Prof. Dr. Kousuke Heki
Dr. Xinggang Zhang
Guest Editors

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• global navigation satellite systems (GNSSs)
• GNSS reflectometry
• signal of opportunity reflectometry
• ocean surface
• land surface
• scattering models