733667-001-020-0003
AI Summary
The document discusses the phenomenon of uncorrelated radar signals, specifically detailing the differences between primary radar returns and secondary beacon returns. It includes a diagram illustrating how these signals can appear on a radar screen when they do not match up in time or location.
Key Findings
- Uncorrelated primary and beacon returns occur when radar signals do not align in time or location. - The primary radar return is the direct signal reflected off the aircraft's surface. - The secondary return is from the aircraft's transponder. - A diagram illustrates the concept of correlated vs. uncorrelated returns.
OCR Text
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 thah the beacon (secondary) transponder signal and the two do not match up as being at the same place or same computer radar cell. | —_ Vn : f\— --RADAR COMPUTER CELL, 1/4 MILE-- RADAR CELL z SAME AIRCRAFT 4 (Crossing Cell) : . 4 y= Sy 4 a SECONDARY UP RADAR a RETURN 3 (Beacon) ! (Transponder) <, Vy PRIMARY RADAR RETURN (Skin- Surface) ) 4 wy) ’ , Wi, 4 =PRIMARY RADAR RETURN (A) =SECONDARY RADAR RETURN 94 FAA KG LAA RADAR =CORRELATED RETURN (Combined Return) Drawing by Paul Steucke March 5, 1987 =UNCORRELATED RETURN
Metadata
- Agency
- National Archives and Records Administration
- Classification
- UNCLASSIFIED
- Department
- National Archives and Records Administration
- Catalog source
- View NARA catalog record
NARA Source
- NAID
- 733667
- File
- 733667-001-020-0003.jpg
- Type
- image/jpeg
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