Accession Number : ADP006189

Title :   Modelling UHF Propagation for Frequency Assignment in Radio Relay Networks,

Corporate Author : FYSISCH EN ELEKTRONISCH LAB TNO THE HAGUE (NETHERLANDS)

Personal Author(s) : Linnartz, Jean-Paul

Report Date : SEP 1989

Pagination or Media Count : 10

Abstract : An account is given of experiences in developing UHF-propagation models for the terrain of the North German plain which is characterised by woods and farmland. A few empirical results on the relevance of modelling the interaction between diffraction and groundwave propagation are discussed. However, the paper mainly focusses on (statistical) methods used to select appropriate models, rather than going into the (physical) details of propagation mechanisms. Since local variability of the field strength prohibits prediction of the feasibility of radio relay links with absolute reliability, (static) diversity tests are recommended to avoid antenna positioning in local multipath nulls. It is shown that such antenna position tests are only worthwhile if the propagation model forecasts local mean signal powers with sufficient reliability.

Descriptors :   *ULTRAHIGH FREQUENCY, *WAVE PROPAGATION, *MODELS, RADIO RELAY SYSTEMS, TERRAIN.

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE