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Record W2112668878 · doi:10.1117/12.533691

Surveillance through concrete walls

2004· article· en· W2112668878 on OpenAlex

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.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueProceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004
Typearticle
Languageen
FieldEngineering
TopicGeophysical Methods and Applications
Canadian institutionsDefence Research and Development Canada
Fundersnot available
KeywordsRadarRadar imagingSynthetic aperture radarRadar lock-onComputer scienceFire-control radarRemote sensingInverse synthetic aperture radar3D radarContinuous-wave radarBistatic radarAcousticsPulse-Doppler radarRadar engineering detailsUltra-widebandAntenna (radio)Multistatic radarGeologyComputer visionPhysicsTelecommunications

Abstract

fetched live from OpenAlex

This paper studies the capability of ultra-wideband short-pulse (UWB SP) radar to provide surveillance through concrete walls, including multistatic radar surveillance and 3D through-wall imaging. A full-wave electromagnetic simulator is used to generate high fidelity through-wall radar data. The raw radar data are transformed into radar images using a back projection algorithm. It is shown that UWB SP radar can track targets moving inside a room with concrete walls as well as providing static mapping of the room interior. The velocity of the electromagnetic wave inside a concrete wall is reduced compared to free space thus defocusing target images, displacing targets from their true positions, and possibly producing false targets. This problem can be mitigated by including the time of flight difference due to the concrete walls into the image generation algorithm. 3D through-wall radar imaging obtained using UWB SP radar centered at 2 GHz requires a very large antenna aperture to be able to see the shape of the human phantoms. However, using a center frequency of 10 GHz reduces this aperture requirement fivefold making the system more practical operationally. However, attenuation is much higher at 10 GHz than at 2 GHz.

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 categoriesMeta-epidemiology (narrow)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.432
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.001
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0010.000
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 head0.013
GPT teacher head0.242
Teacher spread0.229 · 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