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Parabolic Wave Equation based Model for Propagation through Complex and Random Environments

Mukherjee, Swagato
http://orcid.org/0000-0002-3487-4676
http://rave.ohiolink.edu/etdc/view?acc_num=osu1595529187539516

Abstract Details

2020, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Radiowave propagation through various complex environments is a field of active research due to the impact it has on various communication systems. One aspect of radiowave propagation in the marine atmospheric boundary layer (MABL) is the ducting propagation mechanism. Duct formation is highly dependent on atmospheric conditions and hence, research on ducting propagation involves propagation measurements with atmospheric characterization. These measurements eventually lead to improved modeling of such a propagation mechanism. Another aspect of electromagnetic (EM) signal propagation in the atmosphere is the presence of small scale fluctuations of the refractive index leading to the variation of the amplitude and the phase of the received signal. This signal fluctuation is known as scintillation. Scintillation is one of the reasons for signal enhancement or fading in any air-ground or ground-ground communication link. Apart from the atmospheric conditions, factors like rough seas, mountainous terrain or vegetation affect signal propagation. The goal of this dissertation is to develop a comprehensive simulation model using the parabolic wave equation (PWE) to predict the signal propagation effects in all the aforementioned atmospheric and surface conditions. Various experimental campaigns were conducted to measure the propagation loss which can be used to validate the different simulation cases. In all the experiments, a transceiver system, operating from 2 GHz - 40 GHz, was used to measure the propagation loss in different ground/air-ground communication links. In the 2017 CASPER West campaign in southern California, a link was established between the research platform, R/P Flip, stationed around 46.7 km from the shore to measure the propagation loss with time. These fixed ground-ground measurements were made such that the scintillation prediction made in the turbulent MABL by the PWE can be validated. In another campaign, PIMTER 2019, the transceiver system, operating from 2 GHz - 8 GHz, was deployed across Sugarloaf Mountain, Ohio, to measure the propagation loss in a non line-of-sight (NLOS) path for testing the validation of the PWE terrain code. In this dissertation, first a correlated phase screen based PWE model is developed to analyse scintillation effects at microwave and millimeter-wave frequencies. This approach gets rid of the low-frequency limitation associated with the multiple phase screen method, which is widely used with the PWE for scintillation analysis, and essentially makes the scintillation analysis by PWE frequency independent. Secondly, the PWE model developed for terrain here is used to simulate an ocean surface as the terrain such that the effects of forward scattering on the received signal can be understood. The simulated coherent and incoherent power is shown to agree excellently with those extracted from the measurements in CASPER West. Finally, it is shown that a 2D PWE terrain code is incapable of matching the loss measured in the PIMTER campaign as the terrain in the PIMTER campaign cannot be approximated as a 1D terrain. However, a pseudo3D PWE model discussed here is able to match the path loss quite well and at the same time is significantly less computationally intensive than a 3D PWE. Hence, the pseudo3D model is proposed as a fast and reasonably accurate propagation tool for network planning and deployment in NLOS paths.
Caglar Yardim (Advisor)
Robert Burkholder (Committee Member)
Joel Johnson (Committee Member)
136 p.
Electrical Engineering; Electromagnetism
parabolic wave equation; scintillation; correlated phase screen; multiple phase screen; coherent and incoherent power; pseudo3D parabolic wave equation

Recommended Citations

Citations

  • Mukherjee, S. (2020). Parabolic Wave Equation based Model for Propagation through Complex and Random Environments [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595529187539516

    APA Style (7th edition)

  • Mukherjee, Swagato. Parabolic Wave Equation based Model for Propagation through Complex and Random Environments. 2020. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1595529187539516.

    MLA Style (8th edition)

  • Mukherjee, Swagato. "Parabolic Wave Equation based Model for Propagation through Complex and Random Environments." Doctoral dissertation, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595529187539516

    Chicago Manual of Style (17th edition)

osu1595529187539516
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This open access ETD is published by The Ohio State University and OhioLINK.