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Digital terrain data support accurate determination of terrestrial transmitter coverage









Terrain profiles derived from digital terrain databases form the basis of accurate path-loss calculation.

Predicted UHF radar coverage based on digital terrain data.

VHF transmitter coverage colour-coded for signal margin. Predictions based on E-field implementation of internationally accepted ITU models.

Theoretical 'smooth-earth' path loss showing regions (in red) near the horizon where conventional prediction models break down. Such difficulties are usually not mentioned by model developers.

Mobile radio coverage in the presence of fading for different types of ambient RF noise.






Satellite mobile error probabilities in the presence of fading. Results depend critically upon a good knowledge of the fading statistics.

Coherence bandwidth statistics are vital to the design of mobile communication systems.

Transmitter localization error ellipses for moving targets depend critically upon terrain features and DF station/target geometry.

HF coverage prediction demands the use of up-to-date and internationally accepted prediction techniques.





All new propagation and performance models demand field verification before commitment of resources and system implementation.

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