Definition
Unwanted electrical signals or noise that appear within the time interval (the 'gate') during which a radar or electronic system is set to accept and process valid returns. These spurious signals can interfere with the intended target return and degrade the accuracy of the system.
Plain English
Extra electrical noise that shows up during the short window when a radar is listening for a real return, making it harder to see the actual target.
Context Anchor
Seen in airport surface surveillance and ground-control discussions, especially at busy airports with many parked aircraft and service vehicles near the terminal.
Derivation
Gate' here comes from electronics, where a gate is a circuit that opens for a brief, controlled time window to let signals through. 'Clutter' is the standard radar term for unwanted returns. Together: unwanted signals appearing inside the time window when the system is listening.
Why Pilots Care
Can mask real targets such as other aircraft or weather returns, reducing situational awareness during ground movement.
Intuition Check
Gate clutter does not mean bags, passengers, or physical mess at the gate. Here it means unwanted radar or display marks around the gate area.
Example Sentence 1
The technician traced the intermittent DME readings to gate clutter caused by a nearby high-power transmitter.
Example Sentence 2
Gate clutter appeared on the display but did not affect the weather returns ahead of the aircraft.