Results of channel sounding measurements on two ferry routes in Vancouver, BC, Canada
Bibliographic record
Abstract
The authors report the statistical results of RMS delay spreads obtained from the impulse response measurements on the propagation channels of two ferry routes. They also present some impulse responses measured as the ferry was passing through regions where multipath echoes are known to be very active. At both ends of route F2 (Horseshoe Bay to Nanaimo, 30 miles; 1 hr 35 min crossing time) the line-of-sight paths were obstructed by islands, and multipath signals were very active. Route F1 (Tsawwassen to Swartz Bay; 24 miles; 1 hr 35 min crossing time) crisscrosses many islands. In this region, multipath signals are extremely active. The channel impulse response measurements were made with a spread spectrum channel sounder at a frequency of 916 MHz. A chip rate of 3.125 Mb/s, a PN code word length of 127 bits, and a slip rate of 1 kHz were used. Results indicate that at a threshold of -20 dBc, RMS delay spread of 10 mu s and 12 mu s were exceeded 10% of the time for routes F2 and F1, respectively.>
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".