Modeling of radiowave propagation in a forested environment
Author
Ng, Yeow Chong Daniel
Date
2014-09Advisor
Jenn, David C.
Second Reader
Pace, Phillip E.
Metadata
Show full item recordAbstract
Propagation models used in wireless communication system design play an important role in overall link performance. Propagation models in a forested environment, in particular, are especially valuable and complex due to the randomly distributed leaves, twigs, trunks, and trees. This has been an area of interest due to the operational needs of military and non-military domains. Applications in both domains require communication devices and sensors to be operated in forested environments. Various methods have been employed to model propagation loss. There are experimental measurements, empirical models, analytical, and computational electromagnetic methods. Each method has its applicability and limitations. In this thesis, investigation of a three-layer homogenous medium model (air, forest, and ground) by a ray tracing method was carried out. Both transmitting antenna and observation point are within the forest layer. The results from the ray tracing model showed good agreement with the available measurement data up to 100 MHz. Further, better approximation of the transmission loss was observed at separation distances greater than 1 km. Values of the effective electrical properties of the forest played an important role in transmission loss estimation within the forest. After adjustment, the deviation in propagation loss using the ray tracing model achieved an error of 1 dB.
Rights
Copyright is reserved by the copyright owner.Collections
Related items
Showing items related by title, author, creator and subject.
-
Model development for wireless propagation in forested environments
Zegarra, Jesus (Monterey, California: Naval Postgraduate School, 2015-09);Wireless propagation modeling is a necessary task in the design of countless applications. Wireless signals attenuate at different rates according to the propagation environment. Given that vegetation is an unavoidable ... -
Investigation of propagation in foliage using simulation techniques
Chan, Chung Wei (Monterey, California. Naval Postgraduate School, 2011-12);In a foliage environment, radio wave propagation is subjected to fading on both large-scales and small-scales that impair the quality and reliability of data link transmission. This has implications in many military ... -
MACHINE LEARNING APPROACH FOR EVAPORATION DUCT NOWCAST
Yanez, Josue F. (Monterey, CA; Naval Postgraduate School, 2021-06);The Evaporation Duct Height (EDH) and Strength (EDS) are properties of the evaporation duct that affects electromagnetic (EM) signal propagation close to the air-sea interface. Hence, the accuracies of EDH and EDS affect ...