Definition
The duration of a single transmitted pulse of radio-frequency energy in a pulsed system such as radar, measured in microseconds from the start of the pulse to its end. Pulse length determines the minimum range at which a target can be detected and influences the radar's range resolution -- the ability to distinguish two targets close together along the same bearing.
Plain English
How long each burst of radar energy lasts before the transmitter goes quiet and listens for the echo. Shorter bursts let the radar see closer targets and tell apart objects that are close together; longer bursts put more energy out and detect things farther away.
Context Anchor
Seen in radar and avionics discussions, especially when describing how equipment sends and receives short signal bursts.
Derivation
Pulse comes from a Latin word meaning “to beat or strike.” Length usually means size from end to end, but in electronics it often means duration. That helps here: pulse length is the time length of the signal burst, not the physical length of an object.
Why Pilots Care
It determines how well the radar can distinguish between two targets that are close together in range.
Analogy
Think of tapping a flashlight button in short bursts. The pulse length is how long each flash stays on.
Intuition Check
Do not read “length” here as the physical size of the pulse in space. Here, it means how long the transmitted burst lasts in time.
Example Sentence 1
The radar's short pulse length gave good resolution but limited its maximum detection range.
Example Sentence 2
A longer pulse length increases the radar's maximum detection range but may blur close objects on the display.