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Accurate Clutter Power Modeling Technique for Very LowGrazing Angles with RFC Capable Radar Design and Demonstration

Compaleo, Joshua
http://orcid.org/0000-0003-1252-5149
http://rave.ohiolink.edu/etdc/view?acc_num=osu1595563370860726

Abstract Details

2020, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Electromagnetic (EM) waves at radio frequencies (RF) are affected by the medium in which they propagate. Many maritime coastal regions are classified as non-standard propagation environments. Non-standard environments can be characterized by the spatial variation of the index of refraction. The vertical variation in the refractive index is caused by temperature and water vapor changes in the atmospheric surface layer (ASL) above the ocean surface. A consequence of the vertical variation in refraction is the electromagnetic duct, which can trap or bend the EM signal, causing radar system irregularities. Accurate knowledge of the index of refraction is essential in characterizing radar propagation. This dissertation describes the design and deployment of the lower atmospheric propagation (LATPROP) radar system during the CASPER West research campaign, the accurate clutter power modeling and simulation in non-standard propagation conditions for very low grazing angles, and the range dependent, short-range inversion of meteorological parameters in the marine atmospheric boundary layer. The first portion of this dissertation discusses the LATPROP software-defined radar system. The LATPROP radar is a modified Koden MDS-63R marine fishing radar. The radar is magnetron pulsed with a 25 kW peak transmit power and 9.41GHz transmit frequency. The radar was modified for low sea clutter signal power sensitivity for the purpose of sensing fluctuations in lower atmospheric conditions through refractivity from clutter (RFC), sea surface normalized radar cross-section(NRCS) backscatter studies, and radar performance studies in ducted conditions. The CASPER-West field campaign was conducted offshore of Pt. Mugu in Southern California. The timing of CASPER West, from September to October 2017, was chosen with the expectation of variable ducting conditions to include surface,surface-based and elevated ducts. The second section of this dissertation describes the modeling and simulation of low grazing angle sea surface clutter power in a non-standard propagation environment. The process of including an accurate grazing angle estimation algorithm into an existing parabolic wave equation (PWE) framework for proper propagation modeling is presented. The inclusion of an incident field extraction algorithm is explored with the underlying physics of a normalized radar cross-section (NRCS) backscatter model used in conjunction with the existing propagation model in terms of properly modeling the grazing angle, incident field, forward scatter, and backscatter. The third part of this dissertation describes the RFC technique used to estimate the atmospheric refractivity profile based on the measured sea clutter returns. RFC inversion algorithm is developed to estimate the range dependent evaporation duct profile as well as the range dependent meteorological parameters used to estimate the refractivity profile. This large parameter space is optimized using a genetic algorithm (GA) setup. Results are compared against collected meteorological data and NWP data from the Coupled Ocean/Atmosphere Mesoscale Prediction System(COAMPS). The results confirm that estimation of range dependent evaporation duct profiles is possible at close range when the grazing angle, and as a result, sea surface backscatter, is modeled properly.
Caglar Yardim (Advisor)
Joel Johnson (Committee Member)
Bob Burkholder (Committee Member)
Sam Stout (Committee Member)
194 p.
Electrical Engineering; Electromagnetics; Remote Sensing
Radar, Remote Sensing, Refractivity from Clutter

Recommended Citations

Citations

  • Compaleo, J. (2020). Accurate Clutter Power Modeling Technique for Very LowGrazing Angles with RFC Capable Radar Design and Demonstration [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595563370860726

    APA Style (7th edition)

  • Compaleo, Joshua. Accurate Clutter Power Modeling Technique for Very LowGrazing Angles with RFC Capable Radar Design and Demonstration. 2020. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1595563370860726.

    MLA Style (8th edition)

  • Compaleo, Joshua. "Accurate Clutter Power Modeling Technique for Very LowGrazing Angles with RFC Capable Radar Design and Demonstration." Doctoral dissertation, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595563370860726

    Chicago Manual of Style (17th edition)

osu1595563370860726
174
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This open access ETD is published by The Ohio State University and OhioLINK.