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Digital terrain data support accurate determination of terrestrial transmitter coverage







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




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Predicted UHF radar coverage based on digital terrain data.







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







 

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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.

 

 

 

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




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



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



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





 

 

 

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




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






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