Angle of arrival estimation based on warped delay-and-sum (WDAS) beamforming technique
Bibliographic record
Abstract
In antisubmarine warfare (ASW), fast and accurate angle of arrival (AOA) estimation is required in order to localize fast motion targets such as torpedoes. For this purpose we introduce in this paper a new approach called warped delay-and-sum (WDAS) beamforming to estimate the AOA of a narrowband source with uniform linear array (ULA). The basic idea of warped delay-and-sum (WDAS) beamforming is based on calculating the spatial spectrum of the conventional delay-and-sum (DAS) beamforming at nonuniform spaced angles obtained by a spatial frequency transformation using a first order allpass function with a complex valued parameter. This research proves the perfection of the proposed method through simulation work. Moreover, a comparative study will be conducted to compare the performance with the conventional DAS beamforming.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 teacher head, 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".