733667-001-019-0178
AI Summary
The document discusses the phenomenon of uncorrelated radar signals, explaining the differences between primary and secondary radar returns and how they can indicate the presence of an aircraft.
Key Findings
- Uncorrelated primary and beacon returns occur when radar signals do not match up in time or location. - Primary radar signals are direct returns from the aircraft's surface, while secondary signals come from the aircraft's transponder. - The document includes a diagram illustrating the concept of correlated and uncorrelated returns.
OCR Text
i UNCORRELATED RADAR SIGNALS 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. --RADAR COMPUTER CELL, 1/4 MELE~- . “RADAR CELL i SAME AIRCRAFT | a X\ (Crossj{ng Cell) —T - = ¥ — as Ti Ujp-——ae UY YY SECONDARY ~< Se 4 C RADAR = ype a RETURN 3 (Beacon) ' (Transponder) WN PRIMARY RADAR RETURN (Skin- Surface) VY (+ » =PRIMARY RADAR RETURN (N) =SECONDARY RADAR RETURN | - ; =CORRELATED RETURN (Combined Return) Drawing by Paul Steucke . . March 5, 1987 ~~ é =UNCORRELATED RETURN
Metadata
- Agency
- —
- Classification
- UNCLASSIFIED
- Department
- National Archives and Records Administration
- Catalog source
- View NARA catalog record
NARA Source
- NAID
- 733667
- File
- 733667-001-019-0178.jpg
- Type
- image/jpeg
No machine-readable OCR text for this asset. Photographs without captions may have no extractable text.