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Record W305018752

A Calibration Procedure for an HFSWR Receive Array

2001· article· en· W305018752 on OpenAlex
Eric K. Hung

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

aboutThe title or abstract carries a Canadian signal from the geographic lexicon.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
No Canadian affiliation. An affiliation-only frame, the usual design, would never have seen this work. It is one of the works that make the case for inverting the frame.

Bibliographic record

VenueDefense Technical Information Center (DTIC) · 2001
Typearticle
Languageen
FieldEngineering
TopicRadar Systems and Signal Processing
Canadian institutionsnot available
Fundersnot available
KeywordsCalibrationInterference (communication)Phase (matter)AmplitudeNoise (video)Antenna (radio)OpticsMatrix (chemical analysis)RadarAcousticsPhysicsRemote sensingComputer scienceMathematicsGeologyTelecommunicationsStatisticsMaterials scienceArtificial intelligence
DOInot available

Abstract

fetched live from OpenAlex

This report contains a description and performance evaluation of the matrix calibration method developed by the author in 1995 for the receive antenna array in the high frequency surface wave radar (HFSWR) at Cape Race, Newfoundland. The evaluation compares this method with two other methods: (a) the phase-only calibration method being used, and (b) an assumed gain-and-phase method that equalizes the complex element output amplitudes of signals in the boresight direction. The results showed that the matrix calibration method had the most accurate direction estimates, the narrowest spectral peaks, the best resolution of closely space targets, and the lowest signal-to-interference-plus-noise ratio (SINR) threshold for target detection. The phase-only and gain-and-phase methods had false target tracks and direction-dependent biases in direction estimates. The phase-only method also had a line splitting problem. Based on the difference in SINR thresholds for target detection, the matrix calibration method could increase the present maximum nighttime target detection range of the HFSWR by more than 50% in situations where the interference is highly directional and extremely strong.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Not applicable · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.933
Threshold uncertainty score0.592

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.002
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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.

Opus teacher head0.021
GPT teacher head0.244
Teacher spread0.223 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it