Definition
The pattern and strength of radar energy reflected back from an aircraft to a radar receiver. The size, shape, and material composition of the aircraft determine how strongly and distinctly it shows up on a radar display.
Plain English
How an aircraft appears to a radar — basically, how easy it is to see and how big a return it produces on the radar screen.
Context Anchor
Seen in discussions of aircraft materials, aircraft shape, and how easily an aircraft can be detected by radar.
Derivation
From radar (originally an acronym for radio detection and ranging) and signature, meaning a distinctive identifying mark. Together: the distinctive way an aircraft 'shows itself' to a radar.
Why Pilots Care
A smaller radar signature makes the aircraft harder for radar systems to detect, which can reduce collision risk or support mission requirements.
Analogy
A bright object is easier to see with a flashlight than a dull, dark one. In a similar way, an aircraft with a stronger radar signature is easier for radar to “see.”
Intuition Check
A radar signature is not a written signature or a pilot’s approval. It means the aircraft’s detectable return on radar.
Example Sentence 1
Composite aircraft tend to have a smaller radar signature than aluminum aircraft because the materials reflect less radar energy.
Example Sentence 2
Designers work to minimize radar signature when building aircraft for low-visibility operations.