Comparison of HF Groundwave Propagation Models
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The groundwave component of high frequency HF radio propagation is utilized in both civilian and military applications. A variety of groundwave propagation models exist to predict field strength loss over the transmission path. In this thesis, groundwave field strength predictions were compared for programs which employ such models GRWAVE, MIXPATH, and ADVANCED PROPHET. A range of parameter values was used to generate predictions for comparison. HF groundwave field strength predictions by PROPHET were 3 to 10 dB stronger than those of the other programs. GRWAVE and MIXPATH field strength predictions were in close agreement, the difference generally being less than 1 or 2 dB. Field measurements of path loss for two AM broadcast frequencies were evaluated by comparison with estimates provided by ADVANCED PROPHET. The measured groundwave field strengths were found to be from 8 dB weaker at short distances to 18 dB stronger at large distances it is recommended that future efforts be directed toward improving and validating the accuracy of the groundwave propagation models used in these programs. It is also recommended that more extensive documentation be developed for GRWAVE. Groundwave, HF Propagation, Mixpath, GRWAVE, Advanced prophet.
- Radio Communications