Propagation Measurements and Modelling for Multiband Communications on Tactical VHF Channels
Bibliographic record
Abstract
Large scale characterization of the channel average power-delay properties is considered based on quasi-simultaneous mobile propagation measurements at the lower VHF frequencies 37.8, 57.0, and 77.5 MHz. The measurements were conducted in three different environments using vehicle height antennas at both the fixed and mobile terminals, and are therefore considered applicable to tactical networking scenarios likely to be encountered in practice. Model parameters which statistically describe the individual and joint behaviour of power-delay taps as a function of transmission range are estimated from the measured data by least squares regression. Power biases incurred as a result of low power levels at some delays, i.e. below the measurement system multipath sensitivity in certain locations, are mitigated by a statistical imputation algorithm. The results illustrate the impact of transmitter-receiver (Tx-Rx) range and obstacle density in the propagation environment on transmission loss and impulse response shape.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".