Convex Hull Algorithm for Radio Propagation Horizon Angles

  1. Brown, R.G.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Electronic support measure (ESM) assets are used to monitor radio frequency activity on the battlefield. To determine the coverage offered by a particular location, radio propagation (RP) models are used. Typically, such models calculate the received signal strength of a hypothetical enemy transmitter as it is moved about the battlefield. The signal strengths are then used to determine which locations are visible. Unfortunately, RP modeling is computationally intensive because the results are frequency dependent, a large number of enemy transmitter locations are considered, the models are complex, and they must be restarted whenever the receiver location is changed. Thus, RP models must be very efficient to make them practical to use in a tactical environment. A RP model developed by a contractor for Defence Research Establishment Ottawa requires receiver and transmitter horizon angles to be calculated. A very efficient algorithm for calculating these angles is presented. Run-times of the algorithms are compared to those of a straightforward approach and are hsown to be two to three orders of magnitude less. The run-times are also much more linear with respect to the number of input points. A discussion of how to correct for the curvature of the earth is included.

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Report Number
DREO-TM-1999-095 —
Date of publication
01 Oct 1999
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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