Algorithm for Determining Propagation Attenuation Maps Based on Truncated Terrain Profiles

Radio environment maps (REMs) are used to manage radio networks, e.g., mobile ad-hoc networks (MANETs). In this case, network nodes typically use software-defined and cognitive radio technologies. In previous works, we proposed an algorithm for creating the propagation attenuation map (PAM) based on the parabolic equation method (PEM). PEM allows for determining the attenuation distribution along the selected terrain profile, which is taken from the digital terrain elevation data (DTED) for a specific transmitter location. PAM, as a REM element, is used to assess the radio ranges of individual MANET nodes. The developed PAM algorithm is based on terrain profiles determined radially from the transmitter position. This approach resulted in a high density of terrain profile points near the transmitter and simultaneously multiple attenuation determinations for the same terrain points. Therefore, this paper proposes modifications to the PAM algorithm based on truncated terrain profiles. This approach reduces the time for performed calculations and PAM determination.