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Investigation of Coherent Reflections in GNSS-R using CYGNSS

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2020, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Global Navigation Satellite System Reflectometry (GNSS-R) is a remote sensing technique that uses reflected GNSS signals to make measurements of geophysical properties of the Earth's surface. The significant roughness of typical ocean and land surfaces at L-band frequencies commonly result in diffusely scattered GNSS reflections. However, it has been observed that the surfaces of lakes, rivers, wetlands, and other inland water bodies are often sufficiently smooth to produce coherent reflections. Coherent reflections are of particular interest for remote sensing due to their high reflected power, fine spatial resolution, and phase information. Utilizing these reflections enables a unique capability to monitor the global surface water distribution underneath rain, clouds, and dense vegetation. To take full advantage of coherent reflections and best retrieve geophysical information, it is necessary to develop new scattering models, perform simulation studies, and understand how future GNSS-R receivers can be optimized to receive these types of signals. Until now, a comprehensive investigation of this type had not been undertaken. In this work, an electromagnetic scattering model is developed for coherent GNSS reflections over complex scenes with a number of varying surface parameters. The model is utilized to evaluate the accuracy of current water extent retrieval approaches and to propose a novel measurement of wind vector and wave heights from inland waters. Finally, two new algorithms are proposed to improve the science value of coherent GNSS reflections in future GNSS-R instruments.
Inder Gupta (Advisor)
Andrew O'Brien (Committee Member)
Johnson Joel (Committee Member)
Burkholder Robert (Committee Member)
196 p.

Recommended Citations

Citations

  • Loria, E. A. (2020). Investigation of Coherent Reflections in GNSS-R using CYGNSS [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595000933377029

    APA Style (7th edition)

  • Loria, Eric. Investigation of Coherent Reflections in GNSS-R using CYGNSS. 2020. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1595000933377029.

    MLA Style (8th edition)

  • Loria, Eric. "Investigation of Coherent Reflections in GNSS-R using CYGNSS." Doctoral dissertation, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595000933377029

    Chicago Manual of Style (17th edition)