733667-001-011-0012
AI Summary
The document discusses the phenomenon of uncorrelated radar returns from aircraft, specifically detailing the differences between primary radar signals and secondary transponder signals.
Key Findings
- Uncorrelated primary and beacon returns occur when radar signals do not match in timing or location. - Primary radar returns are based on the physical surface of the aircraft, while secondary returns come from transponder signals. - The document includes a diagram illustrating the concept of correlated and uncorrelated radar returns.
OCR Text
. - | ~ — - . ad ~ “ ‘ . « nn Oe en ees a wo a ome « bt w dp ee wo - ww ) A 5 A ly An "uncorrelated primary and beacon(secondary) return on a radar screen occurs: when the radar energy that is sent up toward the aircraft (primary signal) returns off the surface of the aircraft at a slightly different moment than the beacon (secondary) transponder signal and the two do not match up as being at the same place or same computer radar cell. = f\— -~-RADAR COMPUTER CELL, 1/4 MILE-- RADAR CELL SAME AIRCRAFT \ (Cross{ng Cell) — Ur =i Yy, RADAR <a, RETURN WN - -- RADAR CELL, 1/4 MILE-- (Beacon) (Transponder ) /— PRIMARY RADAR RETURN (Skin- Surface) =PRIMARY RADAR RETURN =SECONDARY RADAR RETURN x =CORRELATED RETURN (Combined Return) Drawing by Paul Steucke March 5, 1987 =UNCORRELATED RETURN
Metadata
- Agency
- —
- Classification
- UNCLASSIFIED
- Department
- National Archives and Records Administration
- Catalog source
- View NARA catalog record
NARA Source
- NAID
- 733667
- File
- 733667-001-011-0012.jpg
- Type
- image/jpeg
No machine-readable OCR text for this asset. Photographs without captions may have no extractable text.