Applications of Reflectarray Technology for Radio Astronomy Interference Mitigation
Bibliographic record
Abstract
High-gain reflector antennas commonly used to make observations in radio astronomy are especially susceptible to the reception of undesirable radiation through their sidelobes. One source of this radiation is megaconstellations associated with satellite based communications systems. In this paper, we present some recent advances in the application of reflectarrays for mitigation of interference from these megaconstellations. By placing a reflectarray along the rim of a reflector and thereby repurposing reflections to generate destructive interference to unwanted incoming radiation, interference can be nulled. The first example is a dual band reflectarray capable of producing a null to track interference throughout the sidelobe envelope in two frequency bands associated with Iridium and Starlink satellite systems. The second example is a proof-of-concept demonstration utilizing a C-band planar reflectarray of which the elements along its perimeter are made reconfigurable. Both examples point to the possibility of utilizing reflectarrays for radio astronomy interference mitigation.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.002 |
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".