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Refractivity Inversion Utilizing X-Band Array Measurement System

Pozderac, Jonathan M
http://rave.ohiolink.edu/etdc/view?acc_num=osu1498690950705285

Abstract Details

2017, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Variations in the refractive properties of the marine atmospheric boundary layer (MABL) can lead to non-standard propagation of radiowaves. An ability to quickly assess the influence of the atmosphere on shipboard surveillance and communication systems is required to avoid unwanted extended signal transmissions as well as poor functionality of these systems. While refractive conditions can be determined in numerous ways, methods utilizing radio frequency propagation measurements can directly determine the impact of the atmosphere on these systems. A novel transmit-receive array system called the X-band Beacon-Receiver array (XBBR) was developed with the purpose of determining MABL evaporation duct height (EDH) values. An experiment campaign was conducted to deploy the multichannel array system and corresponding beacon transmitters to investigate their ability to characterize MABL refractivity utilizing both the amplitude and phase of recorded signals. The method proposed compares propagation loss and phase values given by the Variable Terrain Radio Parabolic Equation (VTRPE, Ryan, 1991) modeling software for various propagation environments with measurements obtained by the XBBR array. Meteorological data was also recorded to act as input to the Navy Atmospheric Vertical Surface Layer Model (NAVSLaM); this allows for determination of the evaporation duct height from in-situ meteorological data to serve as the ground truth for comparison with our evaporation duct height estimation. Furthermore, this dissertation investigates the temporal and spatial fluctuations of radio frequency transmissions in a turbulent atmosphere. The multiple receive channels of the XBBR allow for the covariance of signals measured at each receiver to be compared with a model and atmospheric turbulence parameters to be extracted. This model is then used to simulate possible transmit and receive array configurations in an attempt to optimize system performance and minimize ambiguities in EDH inversion. This dissertation discusses campaign measurements, EDH inversion results, the effectiveness of coherently measuring phase to decrease inversion ambiguity, and through simulations studies provides insight into the physical geometry of future propagation measurement systems with improved inversion accuracy.
Joel Johnson (Advisor)
Fernando Teixeira (Committee Member)
Robert Burkholder (Committee Member)
167 p.
Electrical Engineering
Radiowave Propagation; Parabolic Wave Equation; Evaporation Duct; Atmospheric Refractivity

Recommended Citations

Citations

  • Pozderac, J. M. (2017). Refractivity Inversion Utilizing X-Band Array Measurement System [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1498690950705285

    APA Style (7th edition)

  • Pozderac, Jonathan. Refractivity Inversion Utilizing X-Band Array Measurement System. 2017. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1498690950705285.

    MLA Style (8th edition)

  • Pozderac, Jonathan. "Refractivity Inversion Utilizing X-Band Array Measurement System." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1498690950705285

    Chicago Manual of Style (17th edition)

osu1498690950705285
387
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.