VHF/UHF PROPAGATION BY DIFFRACTION - CALCULATION BY NUMERICAL INTEGRATION

Authors
  1. Whitteker, J.H.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN) Dept of Communications
Abstract
Since precise mathematical solutions of the diffraction problem exist only for simple shapes (knife edge, cylinder, sphere), most methods of estimating path loss idealize the terrain as a small number of such shapes, and then apply the solutions to those shapes. The method proposed here, instead of using solutions already worked out, applies approximate diffraction theory to a terrainmodel that retains most of the complexity of the real terrain, and finds a numerical solution to the diffraction problem for each particular transmission path profile. The method is to find the radiowave field as a function of height above each terrain point by integrating over the field above the preceding terrain point, using Huygen's principle. The integration is done not only for direct rays, but also for earth-reflected rays. TRUNCATED
Report Number
AGARD-CP-407-PAP-6 — @Paper presented at the Electromagnetic Wave Propagation Panel Specialists' meeting held in Ottawa, Canada, 20-24 October 1986; CONTAINED IN 88-01966
Date of publication
15 Nov 1987
Number of Pages
7
DSTKIM No
88-01960
CANDIS No
55190
Format(s):
Hardcopy

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